East Bay News
Earthquake swarm shakes East Bay
SAN RAMON, Calif. (KGO) -- There's been a lot of shaking going on in southern Contra Costa County the past few days. There's been a swarm of small earthquakes along the Calaveras Fault, centered primarily around San Ramon and Danville.
The experts say all these little earthquakes are not predictive of anything. According to a UC Berkeley seismologist, the earthquakes in Danville and San Ramon are not precursors or aftershocks, just a swarm.
In the San Ramon Valley, there have been four measurable quakes since Oct. 21 with a magnitude of 2.9 or greater. Wednesday morning there was a minor earthquake with a preliminary magnitude of 3.4, according to the U.S. Geological Survey.
"In the case of a swarm, we think of all the earthquakes, popping, popping and then maybe a bigger one and maybe more smaller ones and then maybe another bigger one," UC Berkeley seismologist Peggy Hellweg said.
The swarms of small quakes are not uncommon since the Calaveras Fault system runs right underneath Interstate 680.
earthquake, san ramon, danville, USGS, uc berkeley, east bay news, laura anthony
- At least 10 arrested at "420" celebration in SF
- Good Samaritan pulls boy from water in San Leandro
- Four stabbed at bar, restaurant in San Jose
- Divers recover more bodies from sunken ferry
- San Francisco officer dragged by suspect getaway car
- Fairfield resident killed, boy injured after shooting
- Santa Rosa crash causes massive power outage
- Highway 1 reopens after major injury crash
- Posey, Lincecum lead San Francisco Giants to 4-3 win
- Chavez gets 1st win, A's complete sweep of Astros
- Boxer Rubin 'Hurricane' Carter dies at 76
- Miss America: Don't suspend teen over prom invite
- Minimalists find happiness living with less
- weather: Bay Area weather forecast for Monday