"An unsettling pattern of the ground shaking often near this city continued Friday morning, when three minor earthquakes hit four minutes apart. The U.S. Geological Survey recorded a magnitude 2.6 earthquake at 8:18 a.m.. Two minutes earlier, the USGS recorded a 2.8 quake, and at 8:14, it recorded a 3.0 tremblor. All three of the earthquakes were centered about 2.5 miles east southeast of San Ramon."
"The third of the three was at a depth of about 5 miles under the Earth's surface and the second one was about 4 miles below the surface. The first quake was about 5 miles below. The quakes add to a long list of them in the area since early November. Before Friday, the most recent of those was a 3.2 earthquake that rattled the area on New Year's Day."
An unsettling pattern of frequent ground shaking near San Ramon continued Friday morning with three minor earthquakes occurring within four minutes. The U.S. Geological Survey logged magnitudes of 3.0 at 8:14 a.m., 2.8 at 8:16 a.m., and 2.6 at 8:18 a.m. All three quakes were centered about 2.5 miles east-southeast of San Ramon. Depths were roughly 4 to 5 miles below the Earth's surface. The sequence is part of a swarm of earthquakes in the area since early November, with magnitudes ranging from 0.6 up to 4.0 on Dec. 19, and a 3.2 event on New Year's Day.
Read at www.mercurynews.com
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