Taken from NBC L.A.
- From: Herschel <kafildafish@xxxxxxxxx>
- Date: Thu, 01 Oct 2009 10:09:06 -0700
Specifically, researchers say the 9.0 earthquake that hit Sumatra
Christmas 2004 weakened the San Andreas fault. The Sumatra quake is
the one that triggered killer tsunamis that left nearly a quarter of
million people dead, mostly in Indonesia, Sri Lanka, India and
Thailand. It was the second largest quake ever measured.
"An unusually high number of magnitude 8 earthquakes occurred
worldwide in 2005 and 2006," said Fenglin Niu, associate professor of
Earth science at Rice University. "There has been speculation that
these were somehow triggered by the Sumatran-Andaman earthquake that
occurred on Dec. 26, 2004, but this is the first direct evidence that
the quake could change fault strength of a fault remotely."
The studies authors focuses their attention on Parkfield, Calif.,
which sits right on the San Andreas Fault and is one of the most
seismically active areas in the country.
Over the past two decades tiny earthquakes have repeatedly hit the
area. By closely comparing seismic readings from these micro-quakes,
the team was able to determine the stress level required to cause the
fault to slip.
They just recently were able to determine one of the slips came during
a five day window in late December 2004, when the Samtran quake hit.
"The long-range influence of the 2004 Sumatran-Andaman earthquake on
this patch of the San Andreas suggests that the quake may have
affected other faults, bringing a significant fraction of them closer
to failure," said Taira. "
The results of the study will appear this week in the journal Nature.
Here's a look at earthquakes in the past century that have been big
enough to trigger tsunami's:
September 2007: A 7.8-magnitude earthquake rattles Sumatra island,
triggering regional tsunami alerts and damaging scores of buildings.
September 2007: An earthquake measured at a magnitude of 8.4 near
Sumatra triggers a wave in the coastal city of Padang.
April 2007: At least 28 people in the Solomon Islands die in a tsunami
and earthquake measured at a magnitude of 8.1.
July 2006: A magnitude-6.1 earthquake triggers a tsunami off Java
island's southern coast, killing at least 600 people.
December 2004: An Indian Ocean tsunami, triggered by a magnitude-9.0
earthquake, kills 230,000 in a dozen countries
August 1976: A magnitude-8.0 earthquake hits near the islands of
Mindanao and Sulu in the Philippines, generating a tsunami and leaving
at least 5,000 dead.
March 1964: An 9.2-magnitude earthquake in Prince William Sound,
Alaska, kills 131 people, including 119 from a tsunami.
April 1946: An earthquake measured at a magnitude of 8.1 near Unimak
Islands, Alaska, triggers a tsunami, killing 165 people, mostly in
Hawaii.
Specifically, researchers say the 9.0 earthquake that hit Sumatra
Christmas 2004 weakened the San Andreas fault. The Sumatra quake is
the one that triggered killer tsunamis that left nearly a quarter of
million people dead, mostly in Indonesia, Sri Lanka, India and
Thailand. It was the second largest quake ever measured.
"An unusually high number of magnitude 8 earthquakes occurred
worldwide in 2005 and 2006," said Fenglin Niu, associate professor of
Earth science at Rice University. "There has been speculation that
these were somehow triggered by the Sumatran-Andaman earthquake that
occurred on Dec. 26, 2004, but this is the first direct evidence that
the quake could change fault strength of a fault remotely."
The studies authors focuses their attention on Parkfield, Calif.,
which sits right on the San Andreas Fault and is one of the most
seismically active areas in the country.
Over the past two decades tiny earthquakes have repeatedly hit the
area. By closely comparing seismic readings from these micro-quakes,
the team was able to determine the stress level required to cause the
fault to slip.
They just recently were able to determine one of the slips came during
a five day window in late December 2004, when the Samtran quake hit.
"The long-range influence of the 2004 Sumatran-Andaman earthquake on
this patch of the San Andreas suggests that the quake may have
affected other faults, bringing a significant fraction of them closer
to failure," said Taira. "
The results of the study will appear this week in the journal Nature.
Here's a look at earthquakes in the past century that have been big
enough to trigger tsunami's:
September 2007: A 7.8-magnitude earthquake rattles Sumatra island,
triggering regional tsunami alerts and damaging scores of buildings.
September 2007: An earthquake measured at a magnitude of 8.4 near
Sumatra triggers a wave in the coastal city of Padang.
April 2007: At least 28 people in the Solomon Islands die in a tsunami
and earthquake measured at a magnitude of 8.1.
July 2006: A magnitude-6.1 earthquake triggers a tsunami off Java
island's southern coast, killing at least 600 people.
December 2004: An Indian Ocean tsunami, triggered by a magnitude-9.0
earthquake, kills 230,000 in a dozen countries
August 1976: A magnitude-8.0 earthquake hits near the islands of
Mindanao and Sulu in the Philippines, generating a tsunami and leaving
at least 5,000 dead.
March 1964: An 9.2-magnitude earthquake in Prince William Sound,
Alaska, kills 131 people, including 119 from a tsunami.
April 1946: An earthquake measured at a magnitude of 8.1 near Unimak
Islands, Alaska, triggers a tsunami, killing 165 people, mostly in
Hawaii.
.
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