Showing posts with label Seismic Activity. Show all posts
Showing posts with label Seismic Activity. Show all posts

Friday, December 02, 2011

The Big Bang?

Hundreds of metres under one of Iceland's largest glaciers there are signs of a looming volcanic eruption that could be one of the most powerful the country has seen in almost a century. Mighty Katla, with its 10km (6.2 mile) crater, has the potential to cause catastrophic flooding as it melts the frozen surface of its caldera and sends billions of gallons of water surging through Iceland's east coast and into the Atlantic Ocean. "There has been a great deal of seismic activity," says Ford Cochran, the National Geographic's expert on Iceland. There were more than 500 tremors in and around the caldera of Katla just in October, which suggests the motion of magma. "And that certainly suggests an eruption may be imminent."

Friday, May 27, 2011

This should take care of any geology majors in Italy...

Seismologists Tried for Manslaughter for Not Predicting Earthquake

Earthquake prediction can be a grave, and faulty science, and in the case of Italian seismologists who are being tried for the manslaughter of the people who died in the 2009 L'Aquila quake, it can have legal consequences.

The group of seven, including six seismologists and a government official, reportedly didn't alert the public ahead of time of the risk of the L'Aquila earthquake, which occurred on April 6 of that year, killing around 300 people, according to the U.S. Geological Survey.

But most scientists would agree it's not their fault they couldn't predict the wrath of Mother Nature.

"We're not able to predict earthquakes very well at all," John Vidale, a Washington State seismologist and professor at the University of Washington, told LiveScience.

Even though advances have been made, the day scientists are able to forecast earthquakes is still "far away," Dimitar Ouzounov, a professor of earth sciences at Chapman University in California, said this month regarding the prediction of the March 11 earthquake in Japan.

Thursday, July 09, 2009

Hang on to your hard hats!

LOS ANGELES – Scientists have detected a spike in underground rumblings on a section of California's San Andreas Fault that produced a magnitude-7.8 earthquake in 1857.

What these mysterious vibrations say about future earthquakes is far from certain. But some think the deep tremors suggest underground stress may be building up faster than expected and may indicate an increased risk of a major temblor.

Researchers at the University of California, Berkeley, monitored seismic activity on the fault's central section between July 2001 and February 2009 and recorded more than 2,000 tremors. The tremors lasted mere minutes to nearly half an hour.

Unlike earthquakes, tremors occur deeper below the surface and the shaking lasts longer.

During the study period, two strong earthquakes hit — a magnitude-6.5 in 2003 and a magnitude-6.0 a year later. Scientists noticed the frequency of the tremors doubled after the 2003 quake and jumped six-fold after 2004.

Tremor episodes persist today. Though the frequency of tremors have declined since 2004, scientists are still concerned because they are still at a level that is twice as high as before the 2003 quake.

The team also recorded unusually strong rumblings days before the 2004 temblor.

Results of the research appear in Friday's issue of the journal Science. The work was funded by the U.S. Geological Survey and National Science Foundation.

"The fact that the tremors haven't gone down means the time to the next earthquake may come sooner," said Berkeley seismologist and lead researcher Robert Nadeau.

Bottled water, canned food, emergency numbers, camping equipment....