Earthquake in California San Francisco Bay Area

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A small earthquake has shaken up a large part of the San Francisco Bay Area in California, in the United States.  Tremors were felt all around San Jose and the epicenter was south east of the city, but the it was even felt all the way north of San Francisco and even close to Santa Rosa and Oakland.

Some different messages reach us as being the earthquake of 4.1, 6, and even 8 on the Richter scale. So far the USGS – United States Geological Survey – officially announced 4.1 on the Richter Scale with an epicenter at nearly 4.4 miles under the earth’s surface. The quake shook the earth at 4:10pm on Friday afternoon ET.

“It’s not unusual for the Calaveras mountains to have magnitude 4 quakes, which may knock things off shelves but are unlikely to cause any structural damage,” said USGS seismologist David Oppenheimer.

The San Francisco Bay Area is known for it’s earthquakes. The Calaveras Fault is a branch from the well known San Andreas Fault. The San Andreas Fault has shown a lot of activity lately with the most massive earthquakes in 1911 (6.5), 1984 (6.2) and recently in 2007 (5.6) their epicenters all centered around the Morgan Hill and Alum Rock areas.

This message just reached us from the USGS wire:

Magnitude 4.1
Date-Time Saturday, January 08, 2011 at 00:10:16 UTC
Friday, January 07, 2011 at 04:10:16 PM at epicenter
Location 37.288°N, 121.663°W
Depth 7.1 km (4.4 miles)


Distances 15 km (10 miles) E (90°) from Seven Trees, CA
17 km (10 miles) ESE (121°) from Alum Rock, CA
18 km (11 miles) N (354°) from Morgan Hill, CA
21 km (13 miles) ESE (106°) from San Jose City Hall, CA


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