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Major quakes can weaken seismic faults far away, scientists say

 
Anonymous Coward
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09/30/2009 07:25 PM
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Major quakes can weaken seismic faults far away, scientists say
Huge earthquakes can weaken seismic faults on the other side of the world, scientists in California said on Wednesday.
Their study coincided with a major 8.0-magnitude quake in the Pacific, unleashing a tsunami that killed scores of people in the Samoan islands and Tonga.

Seismologists led by Taka'aki Taira of the University of California at Berkeley found that the 9.1 monster that struck west of Sumatra in December 2004 weakened a closely-monitored segment on California's San Andreas fault, 8,000 kilometers (5,000 miles) distant.


Their investigation is based on a scan of 22 years of data from the Parkfield area, a district so studded with borehole seismometers and other gauges that it has been dubbed "the earthquake capital of the world."

The monitors found that areas of fluid-filled fractures lie within this section of the fault.

Driven by seismic pressure, the fluid migrates along the fault like spidery veins in marble, acting as a lubricant that enables shocks to pry open the rock, they believe.

Proof of this suspicion came with the finding that repetitive background quakes became smaller and smaller during periods of fluid shift -- in other words, as the fault slowly weakened, less energy was needed to shake it.

But the most remarkable finding was unexpected impacts from two big, distant quakes -- a 7.3-magnitude shake near the Californian town of Landers in 1992 and the 2004 Sumatra behemoth that unleashed the Indian Ocean tsunami.

Almost five days after Sumatra event -- one of the biggest quakes in recorded history -- sensors noted dynamic stress on the Parkfield fault at a depth of five kilometres (three miles).

The study, published by the British weekly science journal Nature, provides compelling support for a novel theory that very big quakes can have a cascade effect elsewhere, sometimes months afterwards, say the researchers.

"The long-range influence of the 2004 Sumatra-Andaman earthquake on this patch of the San Andreas fault suggests that many of the world's active faults were affected in the same way, thus bringing a significant number of them to failure," the study says.

"This hypothesis appears to be supported by the unusually high number of quakes of magnitude eight or above occurring in the three years" after the 2004 event, it said.

"No other large earthquake, of magnitude eight or more, since 1900 was followed by as many for a comparable period," it observed.

The team hopes their work will yield a technique for assessing the strength of a seismic fault -- testing whether it has the strength to resist a shock or rip apart and threaten human life.

Discreet changes in the seismic wave, corresponding to periods when the numbers of small earthquakes intensifies, can be quantified into a means of pinpointing faults that are likely to fail, Taira believes.

Predicting when earthquakes will strike remains an over-the-horizon prospect, although strides have been made into assessing how stress builds up in a fault deep underground.

"Earthquakes are caused when a fault fails, either because of the buildup of stress or because of a weakening of the fault," said Taira in a press release.

"Changes in fault strength are much harder to measure than changes in stress, especially for faults deep in the crust. Our results open up exciting possibilities for monitoring seismic risk and understanding the causes of earthquakes."

[link to www.breitbart.com]
Chris Thats all You GET
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09/30/2009 07:32 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
then California isn't to long off from being the next major earth quake disaster...

matter of fact im certain something soon should happen with the San Andreas fault..
Anonymous Coward
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09/30/2009 07:33 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
...watch Krakatoa..soon
Anonymous Coward
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09/30/2009 07:35 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
interesting
Anonymous Coward
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09/30/2009 07:42 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
just waiting

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09/30/2009 07:57 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Would not want to be in Cali any time soon.
Anonymous Coward
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09/30/2009 08:02 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
its not fluid ...but talc the mineral talcum powder comes from, parkfield has it occuring at the depth of the fault, they suspect it is in hollister ca. also. both places are not prone to earthquakes, yet there is a abundance of movement just the same.
Anonymous Coward (OP)
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09/30/2009 08:03 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
i don't think it matters where you are. if you're near a fault it could be a ticking time bomb! nuke
Anonymous Coward
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09/30/2009 08:09 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Can anyone say H.A.A.R.P???



Resonance can CREATE or it can easily DESTROY-it builds and can build exponentially as well-


Playing with frequencies and MASSIVE GIGA voltage, punching holes in the ionosphere is not the best idea-creating a PLASMA charged environment for all of us to be scorched in
Anonymous Coward (OP)
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09/30/2009 08:09 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
been a few years since my last pin! time for a drunken dance! lol dance
Anonymous Coward
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09/30/2009 08:10 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
we are gona have a world wide tsunami i am 100 percent sure it couldt be 2009 or 2012 i can assure you that
Anonymous Coward
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09/30/2009 08:13 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Would not want to be in Cali any time soon.
 Quoting: just waiting


I just moved here.

yeahsure
Anonymous Coward
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09/30/2009 08:26 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
that is awesome doom news!
just waiting

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09/30/2009 08:35 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Would not want to be in Cali any time soon.


I just moved here.

yeahsure
 Quoting: Anonymous Coward 780843

Good luck and be safe. peace
arosebyanyothername

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09/30/2009 08:38 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Look at this map.

[link to earthquake.usgs.gov]

How can any one place sustain this kind of activity?

This has to have consequences on other faults in the world.
Anonymous Coward
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09/30/2009 09:07 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
[link to hornconcerto.net]

another map
Cyndexia

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09/30/2009 09:11 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Would not want to be in Cali any time soon.


I just moved here.

yeahsure
 Quoting: Anonymous Coward 780843

Hold on your in for a ride!!!!!!! chuckle
"Sometimes the object of the Journey may not be the end, but the Journey itself"


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Aquarius 7

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09/30/2009 09:16 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Oh that's just a lovely piece of news.

huffy

.
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Cayce: The greater portion of Japan must go into the sea. . then we may know it has begun . www.near-death.com/experiences/cayce11.html
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Anonymous Coward
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09/30/2009 09:33 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Elisabeth I FEEL THE BIG ONE COMIN
Anonymous Coward
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09/30/2009 09:35 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Conditioning :)
Anonymous Coward
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09/30/2009 09:38 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
just shampoo :)
Anonymous Coward
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09/30/2009 09:45 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
we are gona have a world wide tsunami i am 100 percent sure it couldt be 2009 or 2012 i can assure you that
 Quoting: Anonymous Coward 757673

Could happen, butI was told that world already went
down thru floods-the biblical NOAH's Ark-
and next time it would be through a fire,
no repeats...


.
mike
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09/30/2009 09:54 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
[link to earthquake.usgs.gov]



Magnitude 5.2
Date-Time

* Thursday, October 01, 2009 at 01:31:05 UTC
* Thursday, October 01, 2009 at 09:31:05 AM at epicenter

Location 4.258°N, 127.508°E
Depth 64.5 km (40.1 miles)
Region KEPULAUAN TALAUD, INDONESIA
Distances 330 km (205 miles) SE of General Santos, Mindanao, Philippines
375 km (235 miles) SSE of Davao, Mindanao, Philippines
1350 km (840 miles) SSE of MANILA, Philippines
2580 km (1600 miles) ENE of JAKARTA, Java, Indonesia
Location Uncertainty horizontal +/- 13.8 km (8.6 miles); depth +/- 14.8 km (9.2 miles)
Parameters NST= 36, Nph= 36, Dmin=377.4 km, Rmss=0.66 sec, Gp=122°,
M-type=body wave magnitude (Mb), Version=6
Source

* USGS NEIC (WDCS-D)

Event ID us2009mfae


starts already some movements
JJackF108

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09/30/2009 09:56 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
we are gona have a world wide tsunami i am 100 percent sure it couldt be 2009 or 2012 i can assure you that

Could happen, butI was told that world already went
down thru floods-the biblical NOAH's Ark-
and next time it would be through a fire,
no repeats...


.
 Quoting: Anonymous Coward 777633


Lot's of fire can occur after a major earth quake. I agree, given plate tectonics there just has to a lot of additional stress being placed on the San Andrus.
Rebirth is possible in life, no matter how many tries it takes!!!

I have an opinion, you just might not like it!!!
Anonymous Coward
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09/30/2009 10:01 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
then California isn't to long off from being the next major earth quake disaster...

matter of fact im certain something soon should happen with the San Andreas fault..
 Quoting: Chris Thats all You GET 777176


what about Alaska?
Anonymous Coward
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09/30/2009 10:04 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
North America is due for some strong ones.
Anonymous Coward
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09/30/2009 10:05 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
i don't think it matters where you are. if you're near a fault it could be a ticking time bomb! nuke
 Quoting: Anonymous Coward 274609

NEW MADRID!!! hiding
Anonymous Coward
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09/30/2009 10:05 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
then California isn't to long off from being the next major earth quake disaster...

matter of fact im certain something soon should happen with the San Andreas fault..


what about Alaska?
 Quoting: Anonymous Coward 783559

hope not cuz im here until the 5th!!!
Anonymous Coward
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09/30/2009 10:42 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
then California isn't to long off from being the next major earth quake disaster...

matter of fact im certain something soon should happen with the San Andreas fault..
 Quoting: Chris Thats all You GET 777176


Check out the patterns on IRIS, you can see there has been some activity on the west coast of the American continent. So far, California is void of activity, but I'm with you, that may change real soon. Could be the San Andreas fault, or the Juan de fuca, which would result in a shift exactly like the 2004 quake in Indonesia. As a resident of california, I would prefer to take my chances with the San Andreas. There has been speculation, that if the Juan De Fuca slips, it will create a tsunami up to 150' high, with a 15 minute warning, just enough time to turn every road into a parking lot.
Anonymous Coward
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09/30/2009 10:50 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Here we go. Parkfield is already lighting up. for those of you not familiar with Parkfield (central calif), it is the most highly monitored city on earth for EQ's, as it is the hub of the San Andreas fault, and also the epicenter of the huge quake in the 1800's (fort Tejon), that sent a crack in the earth from Parkfield to San Bernadino, in minutes. That is now the I5 corridor, which is sparsely populated on the central part of the state, but super high density once it hits LA.

[link to earthquake.usgs.gov]
Anonymous Coward
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09/30/2009 10:53 PM
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Re: Major quakes can weaken seismic faults far away, scientists say
Here we go. Parkfield is already lighting up. for those of you not familiar with Parkfield (central calif), it is the most highly monitored city on earth for EQ's, as it is the hub of the San Andreas fault, and also the epicenter of the huge quake in the 1800's (fort Tejon), that sent a crack in the earth from Parkfield to San Bernadino, in minutes. That is now the I5 corridor, which is sparsely populated on the central part of the state, but super high density once it hits LA.

[link to earthquake.usgs.gov]
 Quoting: Anonymous Coward 772923


Also watch Toms place, the Geysers, and Mammoth, which is the home of the (activity on this map at these places as well) Long valley caldera, which is one of the few Calderas on earth, and very similar to Yellowstone. If that blows, California and much of Nevada and Arizona, goes with it.





GLP