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One thing is certain: Monday's disaster was no coincidence.
One prominent study published in the journal Nature on March 17 suggested with remarkable accuracy that stresses were accumulating on adjacent portions of the Sumatra Trench. Something like this was likely to occur - perhaps within weeks, predicted John McCloskey and his partners at the University of Ulster-Coleraine in Northern Ireland.
If anything, they underestimated how wild things are getting off the coast of Sumatra, where several plates of the Earth's crust grind and dive beneath each other in a geologic wrestling match that researchers call a subduction zone.
"Subduction zone earthquakes are often coupled," McCloskey reported. "An earthquake of magnitude 7-7.5 would seem to represent the greatest immediate threat."
Geophysicists for the U.S. Geological Survey and other laboratories initially described Monday's disaster as an aftershock, and for good reason.
Aftershocks are additional, smaller earthquakes that occur after the main shock and in the same geographic area. They can rattle a region for months or years. Generally, the larger the main shock, the more intense the aftershocks will be and the longer they will persist.
Since Dec. 26, Sumatra has been rattled by powerful aftershocks regularly. Residents probably should expect them to continue for months at least.
I have a friend of mine who is currently vacationing in Thailand, a fellow ATSer, raven2012, I'm going to see if I can get ahold of him and find out more about what's going on here.
Originally posted by cmdrkeenkid
This may seem like a stupid question, but isn't there a super caldera similar to the one at Yellowstone in the region? I've tried googling it myself, but got no luck.
Originally posted by worldwatcher
According to scientists the area will probably continue to feel large aftershocks/quakes for a few months to come.
Originally posted by baaronhaile in the Quake watch thread
2005/03/21 19:07:40 12.73N 90.27W 31.5 [4.9] OFF THE COAST OF EL SALVADOR
2005/03/21 17:06:16 24.96S 177.60W 159.1 [5.5] SOUTH OF FIJI ISLANDS
2005/03/21 16:14:36 1.16S 24.56W 10.0 [5.5] CENTRAL MID-ATLANTIC RIDGE
2005/03/21 14:14:09 12.35N 92.59E 22.9 [5.1] ANDAMAN ISLANDS, INDIA REGION
2005/03/21 12:43:11 24.68S 63.43W 561.6 [6.4] SALTA, ARGENTINA
2005/03/21 12:23:52 24.93S 63.36W 557.8 [6.9] SALTA, ARGENTINA
2005/03/21 04:04:55 24.03S 66.92W 194.9 [4.9] SALTA, ARGENTINA
2005/03/21 00:27:53 37.08N 88.85W 12.4 [2.0] WESTERN KENTUCKY
The Australian - Three-metre wave hits Indonesia
From correspondents in Banda Aceh
March 29, 2005
A THREE-metre wave smashed into the Indonesian island of Simeuleu, off the coast of Sumatra, causing extensive damage shortly after a massive earthquake, a military official said.
More to come
(posted by phreak_of_nature)
What was it, last week? I think it was last week there were two 2 magnitude 6 and above earthquakes in Argentina. Seemed to me to be an odd place for such large earthquakes. (...) Weird damn place for an earthquake.
Originally posted by Macrento
Not at all. Salta is one of the Andean provinces of Argentina, on the northwestern corner of the country, right next to both Bolivia and Chile, so it's rather close to the (dreaded) Ring of Fire of the Pacific. That's prime earthquake territory.
A magnitude 8.7 quake shook Indonesia's west coast, killing hundreds of people and spreading panic that another devastating tsunami was on the way. There was no tsunami, but a small wave was detected by a tide gauge on Cocos Island near Australia, about 1,500 miles south of the epicenter, according to the Pacific Tsunami Warning Center on Oahu.
``I'm baffled an earthquake this size didn't trigger a tsunami near the epicenter,'' said Robert Cessaro, a geophysicist at the center, which is operated by the National Oceanic and Atmospheric Administration. It is responsible for monitoring seismic and ocean conditions in the Pacific and alerting Pacific Rim nations and U.S. agencies,