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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » ATMOSPHERIC CHANGES » Scientists mystified why Northern California earthquake was felt across such a large area

Scientists mystified why Northern California earthquake was felt across such a large area

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PurpleSkyz

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Scientists mystified why Northern California earthquake was felt across such a large area




Posted on May 25, 2013 by The Extinction Protocol


May 25, 2013 CALIFORNIAA magnitude 5.7
temblor Thursday night was the largest earthquake to shake California
since 2008 and has generated curiosity from seismologists. The temblor
occurred in a rugged section of Northern California that has not been
studied as thoroughly as Southern California and the Bay Area and has
less monitoring equipment. Experts said they were surprised the quake
was felt over such a large area, and they plan to go to the region to
investigate. The magnitude 5.7 quake struck around 8:47 p.m., about 150
miles northeast of Sacramento; its epicenter was about 27 miles
southwest of the town of Susanville. The last quake of similar
magnitude, recorded at 5.5, struck Chino Hills in San Bernardino County
in July 2008, said David Schwartz, an earthquake geologist for the
Northern California USGS division in Menlo Park. It caused little
damage, but it was the most sizable quake to hit a metropolitan part of
California since the much larger and destructive 1994 Northridge quake.
Thursday’s quake did occur in a zone with known active faults, said
David Schwartz, an earthquake geologist for the Northern California USGS
division, including a series of faults that extend through the northern
end of Lake Tahoe all the way to Oregon. But 5.7 is the strongest
magnitude recorded in the area. This mountainous eastern Sierra Nevada
region, known for its lakes, rivers and national forests, has had about
seven magnitude 4 earthquakes since the 1930s, Schwartz said. Scientists
are still studying the intensity of Thursday’s shaking and have moved
seismographs there from more populated areas to monitor aftershocks.
Within minutes of the first quake, more than 7,000 people reported
feeling it, from across state borders into Oregon and Nevada and as far
south as the San Francisco area, according to the U.S. Geological Survey
website. Officials in Susanville and Sacramento said the quake set off a
number of home and car alarms and rattled windows. A Chico resident
told The Times he felt a slow roll that lasted about 30 seconds.The
quake itself was not a huge surprise for Schwartz’s USGS division, but
“what was interesting was it was felt along an unusual distance,” he
said. “Earthquakes in different parts of the state are felt over
different distances. We just haven’t had that many examples of
earthquakes in this part of the state, really, for comparison. There are
more interesting questions now than we have answers for, at present,”
he said. –LA Times


Thanks to: http://theextinctionprotocol.wordpress.com



  

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