The US Geological Survey (USGS) shows that within the last three weeks almost 600 earthquakes have struck northern California, which is above fives time the record set 12 years ago.
NBC Bay Area’s quake map highlights all earthquakes recorded near the San Francisco Bay Area in the last 24 hours.
“It’s the swarm with the largest number of total earthquakes in San Ramon,” said USGS scientist David Schwartz,
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Nbcbayarea.com reports:
Still, the number tops the previous record set in 2003, when 120 earthquakes hit over 31 days, with the largest clocking in at a magnitude of 4.2.
The largest magnitude earthquake in the current swarm, which began on Oct. 13, is a magnitude 3.6.
In 1990, a total of 351 earthquakes struck in Alamo, about 30 miles east of San Francisco, over 42 days, with the largest recorded at a magnitude of 4.4. But Schwartz said those numbers might be inaccurate, as technology back then wasn’t as sophisticated.
Despite the nearly 600 quakes that have hit San Ramon in the last month, no injuries or damage have been reported. And the USGS noted that activity has been relatively quiet for the last couple of days.
