San Ramon Earthquake Swarm Tops 600, Activity Has Now 'Died Off:' USGS - NBC Bay Area
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San Ramon Earthquake Swarm Tops 600, Activity Has Now 'Died Off:' USGS

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    A total of 617 earthquakes hit San Ramon from Oct. 13 to Nov. 10. Four small earthquakes were recorded on Nov. 20, 2015

    NBC Bay Area's quake map shows all earthquakes recorded near the San Francisco Bay Area over the past 24 hours.

    An earthquake swarm in the East Bay topped 600 quakes in about a month - breaking a record set in 2003 - but has been quiet in the last two or three weeks, the US Geological Survey said.

    Senior USGS research Geologist David Schwartz told NBC Bay Area on Friday said there were 617 mostly small earthquakes that were recorded in San Ramon between Oct. 13 and Nov. 10. That's almost six times the number that hit the same area in 2003, when 120 earthquakes hit over 31 days, with the largest clocking in at a magnitude of 4.2.

    No earthquake during this latest swarm came close to a magnitude of 4.0.

    But since Nov. 2, Schwartz said that the "swarm has been quiet. Activity has really subsided. It's really died off."

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