"Cellphones across the Bay Area rang out with another earthquake alarm Sunday afternoon, but this time it was not a false alarm. An earthquake with a magnitude of 4.0 shook under Sonoma County at 3:30 pm Sunday, with an epicenter about 3 miles west of Glen Ellen. That was followed by a 3.1M aftershock at 3:38 pm. The Shake Alert message that came through cellphones in San Francisco said that the initial earthquake was a 4.9M, and said to take cover and expect shaking,"
"though no significant shaking was felt in the city. And a preliminary magnitude assigned to the quake was 4.2. A friend of SFist in Glen Ellen said that significant shaking was felt there. This follows a false alarm from the Shake Alert system that was sent out to phones in the Bay Area about an earthquake in Nevada that did not actually occur on December 4."
An earthquake of magnitude 4.0 occurred beneath Sonoma County at 3:30 pm Sunday, with an epicenter about three miles west of Glen Ellen. A 3.1 aftershock occurred at 3:38 pm. Shake Alert messages sent to cellphones in San Francisco reported the initial quake as magnitude 4.9 and advised people to take cover and expect shaking, though San Francisco reported no significant shaking. A preliminary magnitude was listed as 4.2. A resident in Glen Ellen reported significant shaking. The event followed a prior false Shake Alert about a Nevada quake on December 4.
Read at sfist.com
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