Los Angeles (UPI) Aug 20, 2010
California's San Andreas fault has produced more earthquakes than previously thought and is overdue for a major one, a study says.
Scientists spent years studying the geology of the Carrizo Plain area of the San Andreas about 100 miles northwest of Los Angeles to produce the long-awaited report, the Los Angeles Times said Friday.
The last massive earthquake on that section of the fault was in 1857, but researchers from the University of California, Irvine and Arizona State University found that earthquakes have occurred as often as every 45 to 144 years, the newspaper said.
That would make the region overdue for a large catastrophic quake, the study suggests.
Many Southern California seismologists say the report supports their view that the San Andreas has been in a quiet period and that a major rupture is possible.
"What we know is for the last 700 years, earthquakes on the southern San Andreas fault have been much more frequent than everyone thought," UCI researcher Sinan Akciz said.
earlier related report
The moderate 5.4-magnitude quake hit shortly after midnight, 35 kilometres (22 miles) southeast of Hsilin village, with its epicentre at a shallow depth of 5.4 kilometres.
The other more minor quakes struck off Ilan city.
Taiwan is regularly hit by earthquakes because the island lies near the junction of two tectonic plates.
In September 1999, a 7.6-magnitude quake killed around 2,400 people in the deadliest natural disaster in the island's history.
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Tectonic Science and News
Gondwana Supercontinent Underwent Massive Shift During Cambrian Explosion
New Haven CT (SPX) Aug 17, 2010
The Gondwana supercontinent underwent a 60-degree rotation across Earth's surface during the Early Cambrian period, according to new evidence uncovered by a team of Yale University geologists. Gondwana made up the southern half of Pangaea, the giant supercontinent that constituted the Earth's landmass before it broke up into the separate continents we see today. The study, which appears in ... read more
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