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Montserrat volcano spews ash, residents wear masks

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Earth420
User ID: 790498
10/9/2009 9:20 PM

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Montserrat volcano spews ash, residents wear masks
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[link to www.blackoutinformation.com]
From AP News | 2009-10-09 21:12:38
Restive volcano in Montserrat spews ash, forcing residents to wear masks
Rock falls from a spewing volcano stirred up more volcanic ash Friday on the tiny Caribbean island of Montserrat, which lost half its population after a devastating eruption last decade.

Dozens of small earthquakes accompanied ash plumes that have billowed up 20,000 feet (6,000 meters) this week, prompting officials to distribute masks to residents, said James White Jr., acting director of the Disaster Management Coordination Agency.

A thin layer of volcanic residue now coats several northwestern towns, and ashfall — which can cause respiratory problems and tiny scratches on the eyes — is expected to continue, said Paul Cole, director of the Montserrat Volcano Observatory.

Cole said the Soufriere Hills volcano, which stirred to life Sunday for the first time in 10 months, may be creating a new lava dome, a mound of cooled lava that forms at the volcano's opening. It would be at least the fifth time that has occurred since the volcano became active in 1995.

"There aren't any ways to tell how long it will stay active, but it's been going for 14 years on and off, so my guess is that it will continue doing what it's been doing," Cole said.

In 1997, a volcanic eruption killed 19 people and buried much of the island, including its former capital, Plymouth, which is now abandoned. Half the British territory's 12,000 inhabitants left.

Peace
"while pensive poets painful vigils keep"
Anonymous Coward
User ID: 647422
10/9/2009 9:29 PM
Re: Montserrat volcano spews ash, residents wear masksQuote

At least half.

Volcanos are cool, from a distance.
Anonymous Coward
User ID: 647422
10/9/2009 9:38 PM
Re: Montserrat volcano spews ash, residents wear masksQuote

2 - 9 October 2009
Activity at the Soufrière Hills Volcano has been at a high level this week with periods of vigorous ash-venting taking place between the night of October 4 until midnight on October 7. Activity was then low until the early hours of October 9 when rockfall activity increased.
Seismic activity this week has been high, with seventy-one volcano tectonic (vt), fifty six rockfalls and forty one long period earthquakes in total.

The ash-venting events were preceded by a small swarm of twenty-four vt earthquakes starting around 8:45 pm on October 4. There were at least 13 vigorous ash-venting events between 10:00pm on October 4 and 00:01 am on October 7. These events sent ash plumes to between 10,000 and 20,000 ft. Rockfalls and small pyroclastic flows were observed in head of Tyers Ghaut associated with the last three ash-venting events. A helicopter observation flight on the morning of October 7 also revealed fresh rockfall and small pyroclastic flow deposits on the dome talus above Gages, within the chute at the head of the Tar River valley, mostly extending only a few hundred meters from the dome. In the White River valley several generations of pyroclastic flow deposits extended about 1 km south of the dome.

The average gas flux for the week was 269 tons per day. However, there was a marked decrease in sulphur dioxide flux on the October 2, 3 and 4, with 73, 45 and 108 tons per day respectively, compared with 508 tons per day on October 1. Such a sharp decrease in sulphur dioxide flux has previously been observed associated with the onset of periods of increased activity in May and December 2008. Gas fluxes for October 5, 6 and 7 were higher at 565, 273 and 313 tons per day.

The activity in the last week appears to have been sourced from the south central part of the lava dome, such that most rockfall/pyroclastic flow activity is concentrated on the southern side and is being channeled into the White River region. However small areas of incandescence have been observed on the north flank of the dome on the evenings of October 7 and 8.

Although no ashfall occurred in inhabited areas during the ash-venting episodes, a change in wind direction has caused ashfall in Salem, Olveston and Woodlands on the morning of October 9 and further ashfall should be expected in the coming days.

An increase in volcanic activity could occur at any time and with no warning. Lahars are always a potential hazard in river valleys around the volcano during and after periods of heavy rain.

[link to www.mvo.ms]
Earth420
User ID: 790498
10/10/2009 12:16 AM
Re: Montserrat volcano spews ash, residents wear masksQuote

2 - 9 October 2009
Activity at the Soufrière Hills Volcano has been at a high level this week with periods of vigorous ash-venting taking place between the night of October 4 until midnight on October 7. Activity was then low until the early hours of October 9 when rockfall activity increased.
Seismic activity this week has been high, with seventy-one volcano tectonic (vt), fifty six rockfalls and forty one long period earthquakes in total.

The ash-venting events were preceded by a small swarm of twenty-four vt earthquakes starting around 8:45 pm on October 4. There were at least 13 vigorous ash-venting events between 10:00pm on October 4 and 00:01 am on October 7. These events sent ash plumes to between 10,000 and 20,000 ft. Rockfalls and small pyroclastic flows were observed in head of Tyers Ghaut associated with the last three ash-venting events. A helicopter observation flight on the morning of October 7 also revealed fresh rockfall and small pyroclastic flow deposits on the dome talus above Gages, within the chute at the head of the Tar River valley, mostly extending only a few hundred meters from the dome. In the White River valley several generations of pyroclastic flow deposits extended about 1 km south of the dome.

The average gas flux for the week was 269 tons per day. However, there was a marked decrease in sulphur dioxide flux on the October 2, 3 and 4, with 73, 45 and 108 tons per day respectively, compared with 508 tons per day on October 1. Such a sharp decrease in sulphur dioxide flux has previously been observed associated with the onset of periods of increased activity in May and December 2008. Gas fluxes for October 5, 6 and 7 were higher at 565, 273 and 313 tons per day.

The activity in the last week appears to have been sourced from the south central part of the lava dome, such that most rockfall/pyroclastic flow activity is concentrated on the southern side and is being channeled into the White River region. However small areas of incandescence have been observed on the north flank of the dome on the evenings of October 7 and 8.

Although no ashfall occurred in inhabited areas during the ash-venting episodes, a change in wind direction has caused ashfall in Salem, Olveston and Woodlands on the morning of October 9 and further ashfall should be expected in the coming days.

An increase in volcanic activity could occur at any time and with no warning. Lahars are always a potential hazard in river valleys around the volcano during and after periods of heavy rain.

[link to www.mvo.ms]
 Quoting: Anonymous Coward 647422


Thanks for posting!

Peace
"while pensive poets painful vigils keep"
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