It was a small earthquake, measuring just 3.1 on the Richter scale, but its location in the heart of the Sacramento-San Joaquin Delta has experts buzzing.
The Oct. 15 quake was centered 7 miles northwest of Lathrop, on Union Island. No faults are known to exist in that area, where earthquakes are rare. Read more: http://www.sacbee.com/2010/10/27/3135181/experts-puzzle-over-unexpected.html#ixzz13ZU6ULc7