"An earthquake of magnitude 4.0 rattled the Bay Area shortly after 6 A.M. local time on November 26the quake is the largest so far in a string of recent activity near Gilroy, Calif. The U.S. Geological Survey had originally estimated the earthquake to be magnitude 4.3 but quickly revised the strength down to 4.0. That kind of revision is typical in the immediate aftermath of a quake as scientists analyze the data available to them."
"The quake is the latest in a string of geological activity located in the area; USGS has identified 10 tremors in recent weeks that might be connected to this largest-yet event. The prior temblors were predominantly weaker than magnitude 2.0, which people usually do not feel. Since the magnitude 4.0 event, two smaller quakeslocated deeper in Earth's crust than the larger onehave already occurred: first a magnitude 2.7 tremor just to the northeast, then a magnitude 3.6 quake to the southwest of both these events."
A magnitude 4.0 earthquake occurred in the Bay Area shortly after 6 A.M. local time on November 26, centered roughly five miles east of Gilroy and 1.7 miles deep. The U.S. Geological Survey initially estimated the event at magnitude 4.3, then revised it to 4.0. The National Tsunami Warning Center determined there was no tsunami threat. USGS has identified roughly 10 tremors in recent weeks that may be related, most previously below magnitude 2.0 and typically unfelt. Two smaller, deeper quakes followed: a magnitude 2.7 to the northeast and a magnitude 3.6 to the southwest. Residents can report shaking to USGS.
Read at www.scientificamerican.com
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