"A magnitude 3.4 earthquake rumbled in the South Bay on Tuesday morning, according to the U.S. Geological Survey. The temblor struck at 6:48 a.m. and its epicenter was approximately 15 miles south of San Jose and 5 miles east-northeast of Gilroy. At least two small aftershocks were reported in the area shortly after the initial shaker; those shocks measured magnitude 1.3 and magnitude 1.0 respectively."
"The Gilroy area is extremely seismically active even for California. The location where the quake occurred contains multiple major fault lines, including the San Andreas Fault and the Calaveras Fault, along with numerous other smaller faults."
"Experts believe the swarm may be due to fluid-filled cracks near larger fault lines that help trigger the smaller quakes. The last quake above a 2.0 to shake the region was a magnitude 2.8 temblor on March 13; the following day, another 1.8 quake was logged by the USGS."
A magnitude 3.4 earthquake occurred in the South Bay at 6:48 a.m., with its epicenter approximately 15 miles south of San Jose and 5 miles east-northeast of Gilroy at a depth of 4.2 miles. Two small aftershocks measuring magnitudes 1.3 and 1.0 followed shortly after. The quake was felt in San Jose and as far west as Aptos near Santa Cruz. The Gilroy area sits on multiple major fault lines, including the San Andreas and Calaveras Faults, making it extremely seismically active. Concurrently, San Ramon has experienced an ongoing earthquake swarm with hundreds of small quakes since November, with experts attributing this activity to fluid-filled cracks near larger fault lines.
Read at SFGATE
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