Magnitude 3.4 Earthquake Strikes Bay Area Suburbs
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A magnitude 3.4 earthquake struck the Bay Area suburbs of Orinda and Lafayette on Monday morning, causing a 10-minute delay to inspect tracks of the Bay Area Rapid Transit system.
It was the latest in a two-day swarm of seven small temblors.
Authorities reported no damage or injuries from Monday’s 10:50 a.m. quake, centered about 20 miles east of San Francisco.
Inspection of the BART lines is routine in any quake that is distinctly felt.
But even in the magnitude 7.1 Loma Prieta earthquake of 1989, there was no damage to the rail system.
The swarm began Sunday at 7:35 a.m. The strongest quake occurred a little less than an hour later, with a magnitude 3.5 centered two miles northwest of Lafayette.
Scientists with the U.S. Geological Survey said the quakes occurred on a little-known fault close to the Calaveras fault, which had not recorded a quake since 1977.
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