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| | Page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 | Volcano update November 19, see pg 32
| Geogal
User ID: 373387 (OP)
5/22/2008 3:18 PM | | Re: Volcano update November 19, see pg 32 | Quote |
I speak a little spanish for working and living reasons. I can figure out what some things are saying, when written, only due to either pictures, knowing a few words, or the word is really close to one in English... besides that, mi espanol es malade (sp?)...
Yes, these people can back away, thank goodness. And Thanks very much for the article!!!
As far as I can tell the translation is correct, with obvious hitches. Mi espanol es no muy bien. The link to the Sergeomin has a good photo of the dome, if your Mac will let you see it.
It reminds me of Montserrat: violent eruptions followed by gradual dome building, interupted by occasional explosions. The people of Montserrat had nowhere to go because the island is too small, but the volcano makes it bigger if you can wait long enough. At least in Chile they can back off a ways. Quoting: Anonymous Coward 373696 |
| Geogal 
Hu ka pele, lava pour forth
User ID: 373387
5/22/2008 3:35 PM
 | | Re: Volcano update November 19, see pg 32 | Quote |
Here's the picture from the article you supplied... Thanks again!
::chaiten52:
Woman of white garment, foreign woman, earth-eating woman, taking and giving life, she is Pele
"ONCE IN HIS LIFE, EVERY MAN IS ENTITLED TO FALL MADLY IN LOVE WITH A GORGEOUS REDHEAD" - LUCILLE BALL |
| Geogal
User ID: 373387 (OP)
5/22/2008 4:22 PM | | Re: Volcano update November 19, see pg 32 | Quote |
WEST INDIES
Volcano: SOUFRIERE HILLS
16.72N 062.18W 915m
As of the 17th of May, the Monstserrat Volcano Observatory (MVO) reported that activity at the Soufriere Hills volcano increased in the past week. There was a small eruptive event on Tuesday, the 13th of May and mild ash emission started on Thursday, the 15th of May. Volcano-tectonic seismic activity continues intermittently.
The small eruptive event occurred at 1505hrs on Tuesday, 13 May. There was no precursory seismicity and the event was accompanied by a single long-period earthquake. The event was also heard at MVO. There were no pyroclastic flows on the flanks of the volcano. An ash cloud rose to about 3,000 metres (10,000 feet) above sea level, and drifted to the north west over Iles Bay, Belham, Old Town and Olveston. Ashfall was recorded in most of these areas. Ash generation continued for about fifteen minutes, with two or three distinct pulses of darker ash. The ash was accompanied by blue sulphur-dioxide gas, at higher concentrations than is normally seen.
Continuous gentle ash emission from the Gages vent was apparent on the morning of Thursday, 15 May but may have started the previous day. This vent had previously emitted only blue gas. When first seen at around 0800 hrs on Thursday, the ash emission was at a very low rate. This increased slowly until round 1000 hrs and continued steadily throughout the rest of the day, with some variations in the emission rate. There appear to be two distinct vents, consistent with earlier thermal images. The ash rose slowly up the side of the dome and then upwards to about 200 metres (600 feet) above the dome before being blown west on the prevailing light winds. There was at least one small rockfall into the valley between Gages and Galways. Gentle roaring could be heard from St Georges Hill. Ash emission continued, at a slightly reduced rate, on 16 May.
A new fumarolic area also became evident on 15 May. This is on the south-east side of Chances Peak and appears to be emitting moderate amounts of water vapour with very little force. Earthquake activity continued the intermittent pattern seen over the last few weeks. This week, the seismic network recorded 17 rockfalls, 25 volcano-tectonic earthquakes and the one long-period event associated with the eruptive event on 13 May. Almost all of the volcano-tectonic earthquakes were on the 10th and 11th of May and were located at depths between 1.5 and 4 km beneath the summit of the Soufriere Hills Volcano. The rockfalls started on the 11th. The average sulphur dioxide flux for the week was 506 tonnes per day, with daily values ranging from 182 to 765. The observations show continuing unrest at the volcano, with a gradual increase over the last few weeks. The events of this week suggest that fresh magma is rising beneath the dome. There is now a distinct possibility that lava extrusion will start from the Gages vent without any warning. If this happens, it will probably not be long before there were small pyroclastic flows to the west. Even if lava extrusion does not restart, the dome is still a very large mass of very hot material which is capable of collapsing or exploding at any time. Lahar activity in river valleys around the volcano is a potential hazard during and after periods of heavy rainfall. The alert level remains at 4.
The complex, dominantly andesitic Soufrière Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. English's Crater, a 1-km-wide crater breached widely to the east, was formed during an eruption about 4000 years ago in which the summit collapsed, producing a large submarine debris avalanche. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits at Soufrière Hills. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but with the exception of a 17th-century eruption that produced the Castle Peak lava dome, no historical eruptions were recorded on Montserrat until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing major social and economic disruption.
The Current Colour Code for Soufriere Hills is currently at ALERT LEVEL 4 .
The volcano Soufriere Hills on Montserrat in the Caribbean was successfully forecasted by INTLVRC's programme ERUPTION Pro 10.7 to erupt in 2008 with a 100% probability of an eruption event.
[link to www.intlvrc.org] |
| Anonymous Coward
User ID: 438430
5/23/2008 9:14 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Montserrat Volcano Observatory
Weekly Report for the period 17 – 23 May 2008
Activity at the Soufriere Hills Volcano decreased slightly over the past week. The pause in dome growth continues and seismic activity remains low. This week, the MVO recorded 11 rockfalls, 2 long period and 3 volcano-tectonic events.
The average sulphur dioxide (SO2) flux for the week was 653 tons per day (t/d) with a minimum of 457 t/d on May 16 and a maximum of 819 on May 19.
Ash emission from the Gage’s vent hasn’t been observed for the week with the exception of Friday 23 May, starting at 11:25 local time. Intermittent mild ash venting occurred in several pulses from the Gage’s vent, originally accompanied by a long period seismic event. The ash plume rose to slightly less than 3,000 feet (~ 900 m) above the volcano. Light ash fall most likely affected the Plymouth and St Georges Hill areas but should not affect the inhabited areas of Old Town and Olveston thanks to the prevailing eastward wind direction.
The observations show continuing unrest at the volcano. Even if lava extrusion does not restart, the dome is still a very large mass of very hot material which is capable of collapsing or exploding at any time. Lahar activity in river valleys around the volcano is a potential hazard during and after periods of heavy rainfall.
The alert level remains at 4.
Access to all areas on the southern flanks of the Belham Valley except Isles Bay Hill and the east of the Belham Bridge, is prohibited as is south of Jack Boy Hill to Bramble airport and beyond. The Maritime Exclusion Zone around the southern part of the island extends 4 km off shore from Spanish Point to Roches Yard on the east side of the volcano, 2 km offshore from O’Garra’s to Sturge Park on the south west.
Additional information on the Soufrière Hills Volcano, including the risk map, can be found at the MVO website: [link to www.mvo.ms.] |
| geogal
User ID: 373387 (OP)
5/23/2008 9:27 PM | | Re: Volcano update November 19, see pg 32 | Quote |
[HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
Friday, May 23, 2008 07:37 HST (Friday, May 23, 2008 17:37 UTC)
KILAUEA VOLCANO (CAVW#1302-01-)
19.42°N 155.29°W, Summit Elevation 4091 ft (1247 m)
Volcano Alert Level: WATCH
Aviation Color Code: ORANGE
This report on the status of Kilauea volcanic activity, in addition to maps, photos, and webcam images (available using the menu bar above), was prepared by the USGS Hawaiian Volcano Observatory (HVO). Information on the status of Hawai`i Volcanoes National Park can be found at [link to www.nps.gov]
Activity Summary for last 24 hours: Kilauea Volcano is active at two locations. At the summit, small amounts of ash and elevated amounts of sulfur dioxide continued to erupt from the Halema`uma`u vent. At the east rift eruption site, lava continued to erupt from the TEB vent area and flow through tubes to the ocean.
Last 24 hours at Kilauea summit: Molten lava probably exists at shallow depth within the new vent, but cannot yet be seen from the surface.
A white plume (gray or light brown when in shadow) continued to issue from the Halema`uma`u vent; returning trade winds are blowing the plume to the southwest about 800 m (2,600 ft) above the ground. A small amount of ash was found in collectors beneath the plume this morning; this morning's samples contained nearly equal amounts of volcanic glass and altered wallrock dust.
The SO2 emission rate remained high and variable; the most recent average measurement (May 20) was 980 tonnes/day compared to 380 tonnes/day on May 19 and a background rate between 150-200 tonnes/day. The trade winds have returned and so shall our emission rate measurement updates.
The summit tiltmeter network recorded weak inflation. Seismic tremor levels remained at elevated values; temporary episodic increases in tremor continued. GPS receivers on opposite sides of the summit caldera recorded slow contraction and subsidence. The average rate of contraction over the past three months has been about 1 cm (0.4 inches)/month. Seven earthquakes were located beneath Kilauea - one beneath the southwest rift zone, two on south flank faults, and four in a cluster beneath and immediately southwest of Hi`iaka Crater including a magnitude-3.5 at 8:44 am and a magnitude-3.4 at 10:26 pm yesterday.
Last 24 hours at the middle east rift zone vents and flow field: Magma continued to degas at shallow levels beneath Pu`u `O`o before entering the lava tube system under the TEB vent and the rootless shield complex resulting in the emission of about 2,060 tonnes/day when last measured on May 20. No incandescence was seen in the Pu`u `O`o crater last night. The Pu`u `O`o tiltmeter recorded minor oscillations but nothing significant. GPS receivers recorded continued contraction across the crater at a rate of 2 cm (0.8 in)/month. Seismic tremor levels remained at low values with episodic low-frequency tremor bursts; frequent small earthquakes continued to occur in the vent area.
Last night, incandescence was seen from TEB vent area but not from the rootless shields or the flow field above Royal Gardens subdivision. The County Viewing Area was closed yesterday due to unfavorable winds. An overflight is planned for today.
[link to volcano.wr.usgs.gov] |
| Geogal
User ID: 373387 (OP)
5/23/2008 9:29 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Saturday, May 24, 2008
Semeru Volcano, Indonesia -
On Wednesday, Semeru Volcano in Indonesia was upgraded to level 3 alert (out of a maximum 4). During the period 15-19 May there were 432 explosion earthquakes and 6 pyroclastic flows at the volcano. On 20th May there were 92 eruption earthquakes. Eruption of ash continued for periods of 20-30 minutes at a time and reached 400 m above the summit. During the night, ash emissions were accompanied by glowing lava. Some villages are under threat from eruptions, lahars and pyroclastic flows. A 4 km exclusion zone has been placed around the southeast slope of the active crater due to the risk of pyroclastic flows. Volcanic material is building around the crater, and this could mobilise after heavy rain, causing lahars. Evacuations have not been ordered at this stage.
Friday, May 23, 2008
Chaitén Volcano, Chile -
Eruptions continue at Chaitén volcano in Chile. A dome is forming in the active crater, with sporadic explosions and pyroclastic flows. Seismic activity consists of swarm of hybrid events which indicates movement of magmatic fluids and gases, low and high frequency earthquakes. The alert level remains at the highest rating, RED.
[link to volcanolive.blogspot.com] |
| Anonymous Coward
User ID: 438430
5/23/2008 9:29 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Lots of scary doom stuff, technical stuff for the scientists and a few pictures at the MVO site in a new report issued May 13th. |
| Geogal
User ID: 373387 (OP)
5/23/2008 9:34 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Ubinas, Peru
Posted on May 23, 2008 by cosmicbob
Based on SIGMET (Significant Meteorological Information) reports, the Buenos Aires VAAC reported that ash plumes from Ubinas rose to an altitude of 5.5 and 8.5 km (18,000 and 28,000 ft) a.s.l. on 15 and 19 May, respectively. The plumes drifted E and SW.
Tungurahua, Ecuador
Posted on May 23, 2008 by cosmicbob
The IG reported that although visual observations were occasionally limited due to cloud cover during 14-20 May, ash and steam plumes from Tungurahua were spotted most days and rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. Ashfall was reported in areas within 8 km to the SW and W during 14-15 and 17-18 May. On 15 May, Strombolian activity was observed and blocks rolled down the flanks. On 17 and 18 May, “cannon shots” and explosions vibrated large windows in areas to the SW and W. Roaring noises were occasionally heard. On 18 May, a lahar possibly descended a drainage to the W. On 19 May, numerous incandescent blocks rolled about 1.6 km down the flanks following a large explosion. Roaring and “cannon shot” noises were audible and windows vibrated in nearby areas after the large explosion and several others that followed throughout the night. Ashfall was reported in areas W and NW during 19-20 May.
Based on information from IG, the Washington VAAC reported that on 20 May an ash plume rose to an altitude of 7.9 km (26,000 ft) a.s.l. and drifted NW.
Soufriére Hills, Montserrat, West Indies
Posted on May 23, 2008 by cosmicbob
MVO reported that activity at Soufrière Hills increased during 9-19 May. The seismic network recorded 17 rockfalls. An eruptive event on 13 May produced an ash plume to an altitude of 3 km (10,000 ft) a.s.l. and was accompanied by a single long-period earthquake. A blue sulfur dioxide plume was also noted. Ash emissions from two areas in the Gages vent to the W were observed on 15 May, but may have started on 14 May. The resultant ash plume rose about 200 m above the lava dome and drifted W. A small rockfall was noted and gentle roaring noises were reported. A new fumarolic area was seen on the SE side of Chances Peak. Ash emissions from Gages vent continued on 16 May. The Alert Level remained elevated at 4 (on a scale of 0-5).
Based on information from MVO and observations of satellite imagery, the Washington VAAC reported that steam plumes with small amounts of ash continued during 17-19 May and drifted N and WNW.
Shiveluch, Russia
Posted on May 23, 2008 by cosmicbob
KVERT reported that seismic activity at Shiveluch was above background levels on 12 and 14 May and at background levels the other days during 9-16 May; gas-and-ash explosions may have occurred on 14 May. During 9 and 11-15 May, hot avalanches descended the lava dome and fumarolic activity was noted. Observations of satellite imagery revealed that a thermal anomaly was present in the crater daily. During 11-13 May, ash and steam plumes drifted SE, SW, and NW. An ash plume at an altitude of 3.6 km (11,800 ft) a.s.l. was spotted on 14 May. The Level of Concern Color Code remained at Orange.
Based on information from the KEMSD, the Tokyo VAAC reported that on 20 May an eruption plume rose to an altitude of 5.8 km (19,000 ft) a.s.l.
Sakura-Jima, Japan
Posted on May 23, 2008 by cosmicbob
Based on information from JMA, the Tokyo VAAC reported that during 15-21 May eruption plumes from Sakura-jima rose to altitudes of 1.8-3.4 km (6,000-11,000 ft) a.s.l. The plumes drifted N, NE, SE, S, and SW.
Rabaul, Papua New Guinea
Posted on May 23, 2008 by cosmicbob
RVO reported that during 13-15 May gas plumes from Rabaul caldera’s Tavurvur cone produced a haze to the W and NE. During 15-21 May, ash plumes rose to altitudes of 1.7-2.7 km (5,600-8,900 ft) a.s.l. and drifted NE, N, and NW. Ashfall was reported in areas downwind, including Rabaul Town (3-5 km NW). Occasional roaring noises and incandescence at the base of the plume was noted.
Pacaya, Guatemala
Posted on May 23, 2008 by cosmicbob
INSIVUMEH reported that during 19-20 May white fumarolic plumes from Pacaya’s MacKenney cone drifted W. Lava flows from the base of the NW flank traveled 100 m NW in the area between MacKenney cone and Cerro Chino crater to the N. The seismic network recorded small explosions and occasional tremor.
Kilauea, Hawaii, USA
Posted on May 23, 2008 by cosmicbob
Based on visual observations from HVO and National Park Service (NPS) crews and web camera views, HVO reported that during 14-20 May lava flowed SE through a lava tube system underneath Kilauea’s Thanksgiving Eve Breakout (TEB) and rootless shield complex to the Waikupanaha ocean entry. Incandescence was occasionally noted from the TEB vent area. Spatter at the Waikupanaha ocean entry built a second littoral cone.
During the reporting period, Kilauea summit earthquakes were located beneath the Halema’uma’u crater, W of the summit, along the S-flank faults, and along the SW rift zone. The eruption from the vent in Halema’uma’u Crater continued to produce white plumes with minor ash content that drifted mainly NE and occasionally SW. During most nights incandescence was seen at the base of the plume. Seismic tremor was elevated. The sulfur dioxide emission rate was high and fluctuated between 1,320 and 680 tonnes per day when measured on 17 and 18 May, respectively. The background rate was 150-200 tonnes per day.
Karymsky, Russia
Posted on May 23, 2008 by cosmicbob
KVERT reported that seismic activity at Karymsky was above background levels on 11 and 12 May and at background levels the other days during 9-16 May. Gas-and-ash explosions that produced plumes to an altitude of 3.1 km (10,200 ft) a.s.l. may have occurred on 11 and 12 May. Observations of satellite imagery revealed that on 13 May a thermal anomaly was present in the crater and a steam plume drifted 7 km ESE. An ash plume at an altitude of 2 km (6,600 ft) a.s.l. was spotted on 15 May and drifted E. The Level of Concern Color Code remained at Orange.
Based on observations of sateliite imagery, the Tokyo VAAC reported that on 20 May an eruption plume rose to an altitude of 3.4 km (11,000 ft) a.s.l.
Etna, Sicily, Italy
Posted on May 23, 2008 by cosmicbob
INGV-CT reported continuous ash emission and periodic Strombolian activity from multiple vents, possibly along an E-trending fissure E of Etna’s summit craters, during 10-19 May. Observations were limited due to cloud cover. Ash plumes rose to approximate attitudes of 3.5-7.3 km (11,500-24,000 ft) a.s.l. and sulfur dioxide emissions were elevated. Lava flows that issued from the fissure and another fissure to the N traveled about 6 km E into the Valle del Bove during 13-15 May. Ash-and-gas explosions were occasionally accompanied by roaring noises on 14 May. Explosions and roaring noises were audible on 20 May.
Chaitén, Chile
Posted on May 23, 2008 by cosmicbob
Based on observations of satellite imagery and SIGMET reports, the Buenos Aires VAAC reported that during 14-19 May ash plumes from Chaitén rose to altitudes of 5.5-9.1 km (18,000-30,000 ft) a.s.l. and drifted N, NE, and E. Cloudy conditions often inhibited observations. A thermal anomaly was present in the crater on 19 May.
Based on estimates made during an overflight of the area, ONEMI reported on 14 May that about 90 percent of the town of Chaitén was flooded. SERNAGEOMIN reported that on 15 May ashfall accumulated up to 1 mm thick on a ship and an island to the W, and several areas inland were white due to ash cover. Lahars continued to cause the Chaitén and Blanco-Rayas rivers to overflow, affecting new areas in Chaitén town. The Alert Level remained at Red.
According to news articles, the military evacuated small groups of mostly journalists and troops remaining in areas near Chaitén on 19 May. A court ordered police to use force if necessary to move the few remaining people that refused to evacuate to areas outside of the 50 km high-risk zone. |
| lamchop
User ID: 423573
5/23/2008 10:38 PM | | Re: Volcano update November 19, see pg 32 | Quote |
great update - thank you |
| Geogal
User ID: 373387 (OP)
5/23/2008 10:58 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Your very welcome.
great update - thank you Quoting: lamchop |
| Geogal
User ID: 373387 (OP)
5/23/2008 11:01 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Thankyou for this update!
Yes, good that active period for this volcano is on the down turn. But, it's one that's a CLOSE watch. Similar to Kileuea
Montserrat Volcano Observatory
Weekly Report for the period 17 – 23 May 2008
Activity at the Soufriere Hills Volcano decreased slightly over the past week. The pause in dome growth continues and seismic activity remains low. This week, the MVO recorded 11 rockfalls, 2 long period and 3 volcano-tectonic events.
The average sulphur dioxide (SO2) flux for the week was 653 tons per day (t/d) with a minimum of 457 t/d on May 16 and a maximum of 819 on May 19.
Ash emission from the Gage’s vent hasn’t been observed for the week with the exception of Friday 23 May, starting at 11:25 local time. Intermittent mild ash venting occurred in several pulses from the Gage’s vent, originally accompanied by a long period seismic event. The ash plume rose to slightly less than 3,000 feet (~ 900 m) above the volcano. Light ash fall most likely affected the Plymouth and St Georges Hill areas but should not affect the inhabited areas of Old Town and Olveston thanks to the prevailing eastward wind direction.
The observations show continuing unrest at the volcano. Even if lava extrusion does not restart, the dome is still a very large mass of very hot material which is capable of collapsing or exploding at any time. Lahar activity in river valleys around the volcano is a potential hazard during and after periods of heavy rainfall.
The alert level remains at 4.
Access to all areas on the southern flanks of the Belham Valley except Isles Bay Hill and the east of the Belham Bridge, is prohibited as is south of Jack Boy Hill to Bramble airport and beyond. The Maritime Exclusion Zone around the southern part of the island extends 4 km off shore from Spanish Point to Roches Yard on the east side of the volcano, 2 km offshore from O’Garra’s to Sturge Park on the south west.
Additional information on the Soufrière Hills Volcano, including the risk map, can be found at the MVO website: [ link to www.mvo.ms.] |
| Geogal
Hu ka pele, lava pour forth
User ID: 373387
5/23/2008 11:46 PM
| | Re: Volcano update November 19, see pg 32 | Quote |
Chaitén update, 23 May 2008 24 May 2008
::chaiten52:
[Translated key for above image; columna eruptiva principal = principal eruption column; domo antiguo = old dome; domo nuevo = new dome]
23.05.2008 SERNAGEOMIN bulletin on the eruption of Chaitén volcano
On May 21 an active lava dome was found to be present on the northern flank of the old dome of the Chaitén volcano. This dome is being built inside the active crater of the current eruption, which cut through the old dome and has been, in turn, the place of origin of the eruptive column.
As indicated during the first few days, a possible scenario was that the irregular decline in explosive activity culminated in the emission of viscous lava and the beginning of the construction of a dome. In this new phase explosions or the subsequent reactivation of the eruptive column cannot be ruled out.
A volcanic dome is an elevated structure with the shape of a dome or ‘cauliflower’ which results from the emission of viscous lava with very low mobility. The high viscosity, a characteristic property of rhyolitic magmas (magma which contains about 70% silica; in the case of Chaitén 73-75% SiO2, according to the composition of the ash and pumice collected in the first days of the eruption), causes this magma to accumulate around the central vent creating the dome.
Although rhyolitic magmas can cause lava flows, they are radically remote in appearance and physical properties from those commonly recognized as such by the public. Hawaii, for example, produces basaltic magmas that drain as ‘rivers’ of lava with relatively high speeds (10-20 km / hr) and correspond to the archetypal image of a lava flows. The viscous lavas, however, have a rough appearance akin to an accumulation of large blocks, and when on the move they travel at very low speeds (less than 1 km / day).
In the case of Chaitén volcano, it has been noted that the volume of lava emitted is sufficient only to accumulate around the centre of emission, bringing about the construction of a structure in the form of ‘cauliflower’, cupola or dome. SERNAGEOMIN has clearly indicated that, given its low mobility and low volume, it is unlikely that this lava will drain through the valleys.
[link to volcanism.wordpress.com]
Woman of white garment, foreign woman, earth-eating woman, taking and giving life, she is Pele
"ONCE IN HIS LIFE, EVERY MAN IS ENTITLED TO FALL MADLY IN LOVE WITH A GORGEOUS REDHEAD" - LUCILLE BALL |
| Geogal
Hu ka pele, lava pour forth
User ID: 373387
5/24/2008 11:43 PM
| | Re: Volcano update November 19, see pg 32 | Quote |
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
Saturday, May 24, 2008 08:33 HST (Saturday, May 24, 2008 18:33 UTC)
KILAUEA VOLCANO (CAVW#1302-01-)
19.42°N 155.29°W, Summit Elevation 4091 ft (1247 m)
Volcano Alert Level: WATCH
Aviation Color Code: ORANGE
This report on the status of Kilauea volcanic activity, in addition to maps, photos, and webcam images (available using the menu bar above), was prepared by the USGS Hawaiian Volcano Observatory (HVO). Information on the status of Hawai`i Volcanoes National Park can be found at [link to www.nps.gov]
Activity Summary for last 24 hours: Kilauea Volcano is active at two locations. At the summit, small amounts of ash and elevated amounts of sulfur dioxide continued to erupt from the Halema`uma`u vent. At the east rift eruption site, lava continued to erupt from the TEB vent area and flow through tubes to the ocean.
Last 24 hours at Kilauea summit: Molten lava probably exists at shallow depth within the new vent, but cannot yet be seen directly from the surface. The incandescence that can bee seen deep within the vent is heated wall rock (see images); the incandescence seen at night is from this same location but reflected in the gas and ash plume and from the wall marking the east side of the vent.
A white plume (gray or light brown when in shadow) continued to issue from the Halema`uma`u vent; trade winds are blowing the plume to the southwest about 200 m (650 ft) above the ground. A small amount of ash was found in collectors beneath the plume consisting of bits of spatter from the molten pool below and altered rock dust from the walls of the vent.
The SO2 emission rate remained high and variable; the most recent average measurement (May 23) was 1,120 tonnes/day compared to 980 tonnes/day on May 20 and a background rate between 150-200 tonnes/day.
The summit tiltmeter network recorded weak inflation, but not at all sites. Seismic tremor levels remained at elevated values; temporary episodic increases in tremor continued. GPS receivers on opposite sides of the summit caldera recorded slow contraction and subsidence; the preliminary solutions show no movement since May 18. The average rate of contraction over the past three months has been about 1 cm (0.4 inches)/month. Two earthquakes were located on Koa`e faults and three on south flank faults.
Last 24 hours at the middle east rift zone vents and flow field: Magma continued to degas at shallow levels beneath Pu`u `O`o before entering the lava tube system under the TEB vent and the rootless shield complex resulting in the emission of about 2,060 tonnes/day when last measured on May 20. No incandescence was seen in the Pu`u `O`o crater last night. The Pu`u `O`o tiltmeter recorded minor oscillations but nothing significant. GPS receivers recorded continued contraction across the crater at a rate of 2 cm (0.8 in)/month. Seismic tremor levels remained at low values with episodic low-frequency tremor bursts; frequent small earthquakes continued in the vent area.
Yesterday's overflight found a new gas vent inside Pu`u `O`o crater about 30 m (100 ft) below the east rim and directly in line with the July 21 fissures. The vent was jetting gas at temperatures as high as 600 degrees C (1,100 F). The opening of this vent may have been recorded as a flash of incandescence in that area the evening of May 20.
There were three entry points on the Waikupanaha bench with the middle one being the strongest. No surface flows were found.
Yesterday and last night, incandescence was seen from a small skylight between two larger collapses in the TEB vent area. No other incandescence was seen from the rootless shields or the flow field above Royal Gardens subdivision.
[link to volcano.wr.usgs.gov]
Woman of white garment, foreign woman, earth-eating woman, taking and giving life, she is Pele
"ONCE IN HIS LIFE, EVERY MAN IS ENTITLED TO FALL MADLY IN LOVE WITH A GORGEOUS REDHEAD" - LUCILLE BALL |
| Geogal
Hu ka pele, lava pour forth
User ID: 373387
5/24/2008 11:45 PM
| | Re: Volcano update November 19, see pg 32 | Quote |
Activity at Semeru, Indonesia 24 May 2008
A correspondent has helpfully provided more information derived from the Indonesia media about the current alert at Semeru (reported here) and has translated local news reports, throwing more light on the nature of the volcano’s activity. The ‘heat clouds’ referred to in some reports clearly were pyroclastic flows.
The reports come from the Javanese Kompas newspaper and were apparently sent in by Blackberry from an observer on the spot. A 4-kilometre exclusion zone has been established around the volcano because of the danger posed by pyroclastic flows, and the Directorate of Volcanology and Risk Mitigtion warned on 23 May ‘although there is no cause yet for evacuation, residents should be alert up to 10km from the mountain centre in case of potential lahar, lava or pyroclastic flows’. A large number of earthquakes (more than 40) was registered between 00:00 and 18:00 on 23 May along with significant ash emissions. Since 15 May Semeru has released 12 pyroclastic flows with a range of up to 3 kilometres, and there is the potential for future flows to reach as far as 9 kilometres from the volcano.
It’s impossible to get any information from the Directorate of Volcanology and Risk Mitigation website at the moment because, as is not infrequently the case, the site is down. I hope no-one has to depend upon it for information in a crisis. Fortunately (perhaps) Indonesians are used to living with volcanoes: as my correspondent puts it, ‘The local villagers are so used to seeing these eruptions and so used to all the warnings etc it generally needs lava or a pyroclastic flow flowing through their back yard before they will move or evacuate’.
[link to volcanism.wordpress.com]
Woman of white garment, foreign woman, earth-eating woman, taking and giving life, she is Pele
"ONCE IN HIS LIFE, EVERY MAN IS ENTITLED TO FALL MADLY IN LOVE WITH A GORGEOUS REDHEAD" - LUCILLE BALL |
| acolyte nli
User ID: 308272
5/24/2008 11:53 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Chaitén update, 23 May 2008 24 May 2008
::chaiten52:
[Translated key for above image; columna eruptiva principal = principal eruption column; domo antiguo = old dome; domo nuevo = new dome]
23.05.2008 SERNAGEOMIN bulletin on the eruption of Chaitén volcano
On May 21 an active lava dome was found to be present on the northern flank of the old dome of the Chaitén volcano. This dome is being built inside the active crater of the current eruption, which cut through the old dome and has been, in turn, the place of origin of the eruptive column.
As indicated during the first few days, a possible scenario was that the irregular decline in explosive activity culminated in the emission of viscous lava and the beginning of the construction of a dome. In this new phase explosions or the subsequent reactivation of the eruptive column cannot be ruled out.
A volcanic dome is an elevated structure with the shape of a dome or ‘cauliflower’ which results from the emission of viscous lava with very low mobility. The high viscosity, a characteristic property of rhyolitic magmas (magma which contains about 70% silica; in the case of Chaitén 73-75% SiO2, according to the composition of the ash and pumice collected in the first days of the eruption), causes this magma to accumulate around the central vent creating the dome.
Although rhyolitic magmas can cause lava flows, they are radically remote in appearance and physical properties from those commonly recognized as such by the public. Hawaii, for example, produces basaltic magmas that drain as ‘rivers’ of lava with relatively high speeds (10-20 km / hr) and correspond to the archetypal image of a lava flows. The viscous lavas, however, have a rough appearance akin to an accumulation of large blocks, and when on the move they travel at very low speeds (less than 1 km / day).
In the case of Chaitén volcano, it has been noted that the volume of lava emitted is sufficient only to accumulate around the centre of emission, bringing about the construction of a structure in the form of ‘cauliflower’, cupola or dome. SERNAGEOMIN has clearly indicated that, given its low mobility and low volume, it is unlikely that this lava will drain through the valleys.
[ link to volcanism.wordpress.com]
Thankyou Geogal for the daily updates :)
BARAKA BASHAD |
| Geogal
Hu ka pele, lava pour forth
User ID: 373387
5/25/2008 9:28 AM
| | Re: Volcano update November 19, see pg 32 | Quote |
As always, you are very welcome. I enjoy keeping track of this kind of stuff.
For those interested in the count of active erupting volcanoes world wide, it's at 30 right now. Here's the list:
VOLCANO LATITUDE LONGITUDE COUNTRY ALERT LEVEL (E/I)
Bagana 06.14S 155.20E PAPUA NEW GUINEA ALERT LEVEL 3 E
Balbi 05.92S 154.98E PAPUA NEW GUINEA ALERT LEVEL 2 E
Batu Tara 07.79S 123.58E INDONESIA ALERT LEVEL 1 E
Chaiten 42.83S 072.65W CHILE RED E
Egon 08.67S 122.45E INDONESIA ALERT LEVEL 2 E
Erta Ale 13.60N 040.67E ETHIOPIA ORANGE E
Fuego 14.47N 090.88W GUATEMALA ORANGE E
Galeras 01.22N 077.37W COLOMBIA LEVEL III E
Heard Is. 53.11S 073.51E INDIAN OCEAN ALERT LEVEL 2 E
Huila 02.93N 076.03W COLOMBIA ORANGE E
Ibu 01.49N 127.63E HALMAHERA ALERT LEVEL 3 E
Karymsky 54.05N 159.45E KAMCHATKA ORANGE E
Kerinci 01.70S 101.26E SUMATRA ALERT LEVEL 2 E
Kilauea 19.42N 155.29W HAWAII ORANGE E
Krakatau 06.10S 105.42E INDONESIA ALERT LEVEL 3 E
Lopevi 16.51S 168.35E S. PACIFIC ALERT LEVEL 2 E
Miyake-Jima 34.08N 139.53E JAPAN ORANGE E
Mt. Erebus 77.53S 167.17E ANTARCTICA ORANGE E
Mt. Etna 37.73N 015.00E SICILY ORANGE E
Nyiragongo 01.52S 029.25E C. AFRICA ORANGE E
Rabaul 04.27S 152.20E NEW BRITAIN ALERT LEVEL 2 E
Sakura-Jima 31.59N 130.66E JAPAN ORANGE E
Santa Maria 14.76N 091.55W GUATEMALA ORANGE E
Semeru 08.11S 112.92E JAVA ALERT LEVEL 3 E
Sheveluch 56.65N 161.36E KAMCHATKA ORANGE E
Stromboli 38.79N 015.21E ITALY ORANGE E
Suwanose-Jima 29.64N 129.72E JAPAN ORANGE E
Tungurahua 01.47S 078.44W ECUADOR ORANGE E
Ubinas 16.36S 070.90W PERU ORANGE E
Yasur 19.53S 169.44E SO. PACIFIC ALERT LEVEL 3
Chaitén update, 23 May 2008 24 May 2008
Thankyou Geogal for the daily updates :)
BARAKA BASHAD Quoting: acolyte nli 308272
Woman of white garment, foreign woman, earth-eating woman, taking and giving life, she is Pele
"ONCE IN HIS LIFE, EVERY MAN IS ENTITLED TO FALL MADLY IN LOVE WITH A GORGEOUS REDHEAD" - LUCILLE BALL |
| Anonymous Coward
User ID: 438430
5/25/2008 1:05 PM | | Re: Volcano update November 19, see pg 32 | Quote |
For those interested in the count of active erupting volcanoes world wide, it's at 30 right now. Here's the list: Quoting: Geogal
Good list, but kind of hard to read. The majority (or at least a big fraction) seem to be from Indonesia. If you have time, maybe you can summarize by country or continent, or maybe break out "ring of fire" from non-ring of fire volcanoes. |
| Anonymous Coward
User ID: 421424
5/25/2008 1:37 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Something else that would be interesting, but I haven't seen anything on specifically, is how does the worldwide activity today compare with activity in say, the last century or more.
Am sure the info is out there, but I wouldn't begin to know how to find it. It is really 'major' heating up or is this just another mini cycle? |
| OxygenX
User ID: 439245
5/25/2008 1:42 PM
 | | Re: Volcano update November 19, see pg 32 | Quote |
I seem to recall reading somewhere that we have around 60 Eruption Events per year.
Cheers.
-----------------------------
"Your world's on fire and it's about to expire" |
| Geogal
User ID: 373387 (OP)
5/25/2008 5:21 PM | | Re: Volcano update November 19, see pg 32 | Quote |
The eruption events known used to be about 30 per year, some more, some less. But, that was before instant access to all parts of the globe, where a small eruption in out of the way Chile wouldn't be known by most of the world, or Antarctica, or most of the Aleutians in Alaska, some place far off in out of the way areas of China or Russia. With the ability of satellites and the web, we can find out the number actively erupting pretty easily. There is also greater and better coverage. last bit of info I'd read about how many we have erupting each year now, with our ability to look more closely at about anything aned new volcanoes found like Antarctica, is in the 50's... again more some years and less other. So, a memory of about 60 in a given year is not far off from possible, even potential.
Something else that would be interesting, but I haven't seen anything on specifically, is how does the worldwide activity today compare with activity in say, the last century or more.
Am sure the info is out there, but I wouldn't begin to know how to find it. It is really 'major' heating up or is this just another mini cycle? Quoting: Anonymous Coward 421424 |
| Geogal
User ID: 373387 (OP)
5/25/2008 5:25 PM | | Re: Volcano update November 19, see pg 32 | Quote |
I'll try to find the time... It's a list alphabetical I found on the web and one of the update sites I visit. LOL!!!
Yes, the majority of volcanoes are in Indonesia, then Chile, the The Aleutians of Alaska. So, most of the worlds volcanoes are in the ring of fire, and a good percentage of the most violent eruptions have happened in Indonesia.
Good list, but kind of hard to read. The majority (or at least a big fraction) seem to be from Indonesia. If you have time, maybe you can summarize by country or continent, or maybe break out "ring of fire" from non-ring of fire volcanoes. Quoting: Anonymous Coward 438430 |
| Geogal
User ID: 373387 (OP)
5/25/2008 5:30 PM | | Re: Volcano update November 19, see pg 32 | Quote |
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
Sunday, May 25, 2008 08:06 HST (Sunday, May 25, 2008 18:06 UTC)
KILAUEA VOLCANO (CAVW#1302-01-)
19.42°N 155.29°W, Summit Elevation 4091 ft (1247 m)
Volcano Alert Level: WATCH
Aviation Color Code: ORANGE
This report on the status of Kilauea volcanic activity, in addition to maps, photos, and webcam images (available using the menu bar above), was prepared by the USGS Hawaiian Volcano Observatory (HVO). Information on the status of Hawai`i Volcanoes National Park can be found at [link to www.nps.gov]
Activity Summary for last 24 hours: Kilauea Volcano is active at two locations. At the summit, small amounts of ash and elevated amounts of sulfur dioxide continued to erupt from the Halema`uma`u vent. At the east rift eruption site, lava continued to erupt from the TEB vent area and flow through tubes to the ocean.
Last 24 hours at Kilauea summit: Molten lava probably exists at shallow depth within the new vent, but cannot yet be seen directly from the surface. The incandescence that can bee seen deep within the vent is heated wall rock; the incandescence seen at night is from this same location but reflected in the gas and ash plume and from the wall marking the east side of the vent.
A white plume (gray or light brown when in shadow) continued to issue from the Halema`uma`u vent; trade winds are blowing the plume to the southwest about 300 m (1,000 ft) above the ground this morning. A small amount of ash was found in collectors beneath the plume consisting of bits of spatter from the molten pool below and altered rock dust from the walls of the vent in approximately equal amounts; more tephra was found in collectors this week than was found last week.
The SO2 emission rate remained high and variable; the most recent average measurement (May 24) was 1,540 tonnes/day compared to 1,120 tonnes/day on May 23 and a background rate between 150-200 tonnes/day.
The summit tiltmeter network recorded weak inflation, but again not at all sites. Seismic tremor levels have gradually decreased since early April but remain at elevated values; temporary episodic increases in tremor continued. GPS receivers on opposite sides of the summit caldera recorded no contraction or extension greater than measurement error since May 18. The average rate of contraction over the past three months has been about 1 cm (0.4 inches)/month. One earthquake was located on Koa`e faults and two on south flank faults.
Last 24 hours at the middle east rift zone vents and flow field: Magma continued to degas at shallow levels beneath Pu`u `O`o before entering the lava tube system under the TEB vent and the rootless shield complex resulting in the emission of about 2,060 tonnes/day when last measured on May 20. No incandescence was seen in the Pu`u `O`o crater last night. The Pu`u `O`o tiltmeter recorded minor oscillations and weak inflation starting around noon yesterday. GPS receivers recorded continued contraction across the crater at a rate of nearly 2 cm (0.8 in)/month. Seismic tremor levels remained at low values with episodic low-frequency tremor bursts; frequent small earthquakes continued in the vent area.
Incandescence was seen from a small skylight between two larger collapses in the TEB vent area. No other incandescence was seen from the rootless shields or the flow field above Royal Gardens subdivision. An HVO geologist completed mapping the tube on the coastal plain and reported that the Waikupanaha entries were going strong, exploding and throwing spatter up to 20 m (65 ft) in the air, and generally affording the public good, safe views from the County Viewing Area. No surface flows were observed anywhere on the flow field.
[link to volcano.wr.usgs.gov] |
| Geogal
User ID: 373387 (OP)
5/26/2008 1:09 AM | | Re: Volcano update November 19, see pg 32 | Quote |
THIS IS EXCELLENT NEWS!!! Hope the earthquakes stay far and deep.
Chaitén: ‘exclusion zone’ reduced 25 May 2008
The Chilean Government’s Oficina Nacional de Emergencia (ONEMI) has today announced an easing of the security restrictions that have been in place at Chaitén since the eruption began more than three weeks ago. The total exclusion zone around the town of Chaitén, formerly 50 kilometres in radius, has been reduced to 24 kilometres, ‘given the lessened activity shown by the Chaitén volcano, the ash column of which has reducedd to 4 kilometres in height’. ONEMI emphasizes, however, that this does not mean that Chaitén residents can anticipate returning to their homes:
This measure is only to permit residents of the sector to recover their possessions and transfer their animals, as well as the ponds for breeding salmon. The authority reiterates that this arrangement will not permit the return of families to their homes, since the volcanic activity and the risk that it poses to the surrounding areas is continuing. The police have moved their checkpoints to this new security radius.
Two other quick notes. First SERNAGEOMIN’s site appears at the moment (20:46 GMT) to be down. Second, the earthquakes (see details from the USGS here) that occurred over the night of 23/24 May caused some excitement, not least in the Argentine press which assumed that they were caused by the Chaitén eruption. Surely, however, they were too far away (100 kilometres north of the volcano) and too deep (around 70-80 kilometres down) to be connected with the volcano? These were almost certainly regular tectonic quakes.
[link to volcanism.wordpress.com] |
| Geogal
Hu ka pele, lava pour forth
User ID: 373387
5/26/2008 10:23 AM
| | Re: Volcano update November 19, see pg 32 | Quote |
This should read a little more easy than the last one. It's organized by country, and to a degree, area.
CURRENTLY ACTIVE VOLCANO LATITUDE LONGITUDE COUNTRY
<Ring of FIRE Volcanoes>
Semeru 08.11S 112.92E JAVA
Bagana 06.14S 155.20E PAPUA NEW GUINEA
Balbi 05.92S 154.98E PAPUA NEW GUINEA
Rabaul 04.27S 152.20E NEW BRITAIN
Batu Tara 07.79S 123.58E INDONESIA
Krakatau 06.10S 105.42E INDONESIA
Egon 08.67S 122.45E INDONESIA
Heard Is. 53.11S 073.51E INDIAN OCEAN
Kerinci 01.70S 101.26E SUMATRA
Ibu 01.49N 127.63E HALMAHERA
Popocatepetl 19.02N 098.62W MEXICO
Poas 10.20N 084.23W COSTA RICA
Fuego 14.47N 090.88W GUATEMALA
Santa Maria 14.76N 091.55W GUATEMALA
Galeras 01.22N 077.37W COLOMBIA
Huila 02.93N 076.03W COLOMBIA
Tungurahua 01.47S 078.44W ECUADOR
Ubinas 16.36S 070.90W PERU
Chaiten 42.83S 072.65W CHILE
Lopevi 16.51S 168.35E S. PACIFIC
Yasur 19.53S 169.44E SO. PACIFIC
Karymsky 54.05N 159.45E KAMCHATKA
Sheveluch 56.65N 161.36E KAMCHATKA
Miyake-Jima 34.08N 139.53E JAPAN
Sakura-Jima 31.59N 130.66E JAPAN
Suwanose-Jima 29.64N 129.72E JAPAN
<not RoF>
Kilauea 19.42N 155.29W HAWAII
Mt. Erebus 77.53S 167.17E ANTARCTICA
Mt. Etna 37.73N 015.00E SICILY
Stromboli 38.79N 015.21E ITALY
Ol Doinyo Lengai 02.76S 035.91E E. AFRICA
Erta Ale 13.60N 040.67E ETHIOPIA
Nyiragongo 01.52S 029.25E C. AFRICA
Woman of white garment, foreign woman, earth-eating woman, taking and giving life, she is Pele
"ONCE IN HIS LIFE, EVERY MAN IS ENTITLED TO FALL MADLY IN LOVE WITH A GORGEOUS REDHEAD" - LUCILLE BALL |
| Anonymous Coward
User ID: 438430
5/26/2008 11:04 AM | | Re: Volcano update November 19, see pg 32 | Quote |
Nice organization on the update, and good news from Chile. |
| geogal
User ID: 373387 (OP)
5/26/2008 4:11 PM | | Re: Volcano update November 19, see pg 32 | Quote |
I've seen a few people mentioning concern over Long Valley Caldera area, so figured it'd be worth showing an update of current activity.
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Monday, May 26, 2008 08:00 PDT (Monday, May 26, 2008 15:00 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The realtime detection system located two small earthquakes in the Long Valley caldera area since the last update at 7:18 AM (DPT) on May 25. Both were located in the Sierra Nevada south of the caldera and both had magnitudes less than M=2.0.
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
[link to volcano.wr.usgs.gov]
The locations of monitoring stations and steam vents can be viewed here
[link to lvo.wr.usgs.gov]
Future Eruptions in California's Long Valley Area—What's Likely?
Long Valley Caldera and the Mono-Inyo Craters chain form a large volcanic complex in eastern California that has had persistent earthquake activity and ground uplift in recent decades. Volcanoes have been active in the area for millions of years, and future eruptions are certain to occur. When the next eruption in the area does occur, it will most likely be small and from a site in the Mono-Inyo chain.
The three Inyo Craters, part of the Mono-Inyo Craters volcanic chain, stretch northward across the floor of Long Valley Caldera, a large volcanic depression in eastern California. During the past 1,000 years there have been at least 12 volcanic eruptions along the chain, including those that formed the Inyo Craters and South Deadman Creek Dome.
Recent earthquake swarm in Long Valley area:
Ml0.6 2008/05/21 19:04:00 37.640N 118.949W 7.2 3 km (2 mi) E of Mammoth Lakes, CA
Ml1.0 2008/05/21 17:07:10 37.638N 118.948W 7.7 3 km (2 mi) E of Mammoth Lakes, CA
Ml0.9 2008/05/21 15:56:46 37.639N 118.945W 7.2 3 km (2 mi) E of Mammoth Lakes, CA
Ml1.1 2008/05/21 07:43:49 37.640N 118.948W 7.4 3 km (2 mi) E of Mammoth Lakes, CA
Ml1.0 2008/05/21 05: 51:43 37.642N 118.948W 7.1 3 km (2 mi) E of Mammoth Lakes, CA
Ml1.8 2008/05/21 05:33:12 37.639N 118.949W 7.6 3 km (2 mi) E of Mammoth Lakes, CA
Ml1.0 2008/05/21 04:10:57 37.640N 118.949W 6.9 3 km (2 mi) E of Mammoth Lakes, CA
Ml2.0 2008/05/21 03:46:29 37.639N 118.948W 8.0 3 km (2 mi) E of Mammoth Lakes, CA
Ml0.8 2008/05/21 03:44:37 37.639N 118.949W 7.3 3 km (2 mi) E of Mammoth Lakes, CA
ml1.6 2008/05/21 03:31:36 37.639N 118.947W 7.6 3 km (2 mi) E of Mammoth Lakes, CA
ml1.4 2008/05/23 12:18:03 37.553N 118.849W 9.4 15 km ( 9 mi) SE of Mammoth Lakes, CA
ml1.3 2008/05/23 07:31:46 37.630N 119.032W 3.6 5 km ( 3 mi) W of Mammoth Lakes, CA
The the early one at a shallower depth is not at the same epicenter... close, but. the one nearest the other epicenters is deeper and later... volcanic activity doesn't really look so much like this, but they are all very shallow, less than 10km, so there really isn't much difference in depth. it's also grouped very far apart in time for volcanic activity to be imminent. Seems more like stresses and aftershocks. |
| Anonymous Coward
User ID: 373696
5/27/2008 11:56 AM | | Re: Volcano update November 19, see pg 32 | Quote |
Weather is clear in Chile today (Hot tamale?).
Anyway, if you can see it, this site [link to www.smn.gov.ar]
gives a good satellite view of the ash plume blowing north, up the length of Chile. Click on the "Visible - Norte Patagonia link for the latest. |
| Geogal
User ID: 373387 (OP)
5/27/2008 12:03 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Weather is clear in Chile today (Hot tamale?).
Anyway, if you can see it, this site [ link to www.smn.gov.ar]
gives a good satellite view of the ash plume blowing north, up the length of Chile. Click on the "Visible - Norte Patagonia link for the latest.
Thanks!
Chaitén update, 27 May 2008 27 May 2008
Posted by volcanism in Chaitén, Chile, activity reports, eruptions, volcanoes.
Tags: Chaitén, Chile, South America, volcanic activity reports, volcanic eruptions, volcanoes
trackback
SERNAGEOMIN issued a new bulletin on the situation at Chaitén late yesterday, 26 May 2008. It reports that ‘The eruptive activity of the Chaitén volcano has declined to subplinian type, but remains continuous’, and that over the weekend, and ‘in particular on Sunday 25 May’, the eruption column reached an average altitude of less than 3.5km above sea level, with occasional large explosions lifting it to around 5km above sea level. South-westerly winds pushed the plume in a north-easterly direction.
An overflight took place on 24 May, during which ‘it was possible to overfly the volcano’s crater and examine the slight growth of the active volcanic dome, which just rises above the summmit of the old dome’. South of the active dome is a 200-metre crater ‘from which there is a continual expulsion of gas and ash’. The new dome ‘generates, especially to the north, flows and blocks of ash, because of the instability of its steep walls’.
A second overflight carried out by a Navy helicopter on 25 May revealed that many of the rivers in the Chaitén region are carrying significant quantities of ash: ‘It was observed that the Amarillo river was carrying a large burden of ash and abundant pumice of various sizes into the Yelcho river, the waters of which already contained ashes and had also received volcanic material, mainly ash, from the Minchinmahuida river’. The Correntoso river running from the north-east, was observed to be carrying ash into Lake Yelcho, and the Futaleufú and Azul rivers running into the southern end of the lake were also carrying smaller loads of ash, but but the other rivers debouching into the lake were clear. Flooding and the deposition of volcanic sediment continue to affect the town of Chaitén.
Seismic activity is currently declining: ‘Over the past four days VT-type [volcano-tectonic] earthquakes have decreased gradually in number and magnitude, indicating a slight but steady decay of seismic activity’. The explosions ‘associated with emissions of gases, ash and other pyroclasts’ are continuing, but are of ‘lesser intensity and volume’.
The apparent decline in activity should not lead to any complacency about the volcano’s future behaviour, concludes the report:
Finally, although the volcanic activity has declined, the occurrence of future major explosions cannot be excluded, caused by obstruction of the conduit, which could produce the partial destruction of the new (and/or the old) dome and generate pyroclastic flows through the collapse of the eruption column, which would fall in a radial form from the volcano over the adjacent valleys. Nor can the possibility of lateral explosions be disregarded.
The latest (0800 GMT today) ash advisory from Buenos Aires VAAC indicates that the plume is reaching 21000 feet, which is an altitude of about 6.4 kilometres. The aviation alert code, which had been orange yesterday, is now red again. A satellite image from the Argentine Servicio Meteorológico Nacional, taken at 17:45 GMT yesterday, shows a significant plume from Chaitén blowing north-east.
UPDATE: Alan Sullivan points out that, regardless of whether the new dome has shown only ’slight growth’ in height, it’s got a great deal bigger through lateral expansion.
[link to volcanism.wordpress.com] |
| Geogal
User ID: 373387 (OP)
5/27/2008 12:11 PM | | Re: Volcano update November 19, see pg 32 | Quote |
Really funny... but the links on that page now work for me... love-hate relationship with computers.. LOL!!
Thanks!
Weather is clear in Chile today (Hot tamale?).
Anyway, if you can see it, this site [ link to www.smn.gov.ar]
gives a good satellite view of the ash plume blowing north, up the length of Chile. Click on the "Visible - Norte Patagonia link for the latest. |
| Anonymous Coward
User ID: 98008
5/27/2008 12:19 PM | | Re: Volcano update November 19, see pg 32 | Quote |
thanks for all your efforts here Geo Gal.. Its appreciated here |
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