A series of small earthquakes shook the San Francisco Bay Area early Monday morning, an area that has seen a lot of seismic activity in recent months.
Bay Area Rapid Transit said trains were briefly running at low speeds during routine track safety inspections, causing delays. (Reuters/Representative Image)Monday’s strongest earthquake was a magnitude 4.2 that struck just south of San Ramon shortly after 7 a.m., according to the U.S. Geological Survey.
At least a dozen other smaller earthquakes struck the same area starting at 6:30 a.m. and continuing for more than an hour.
There were no immediate reports of major damage.
Also Read: San Ramon earthquake: Tremors felt in Oakland, Richmond and San Francisco
Bay Area Rapid Transit said trains were briefly running at low speeds during routine track safety inspections, causing delays.
Tremors were felt more than 48 kilometers away across San Francisco and the East Bay cities of Oakland and Richmond.
San Ramon has been rocked by several recent earthquakes. According to a San Francisco Chronicle analysis of USGS data last month, the Contra Costa County area recorded 87 earthquakes of magnitude 2 or greater in November and December.
According to seismologists, the region has a history of earthquake swarms, when earthquakes repeatedly strike a small area and do not follow a typical mainshock-aftershock sequence.
