The East Bay was rocked by two earthquakes within two minutes of each other on Monday. The US Geological Survey said the first 3.7-magnitude earthquake was detected at about 6:27 a.m. and was located just over two miles southeast of San Ramon.
A second 3.3 earthquake struck two minutes later with an almost identical epicenter. There were no immediate reports of injuries or significant damage.
The East Bay area, where San Ramon is located, experienced seismic activity late Friday afternoon. The earthquake occurred about 3 miles north of the Dublin area. Meanwhile, on November 9, eight earthquakes struck the region in the space of three hours.
Earthquakes above magnitude 2.5 are usually strong enough to be felt by people near the epicenter, but rarely cause damage to buildings. The Bay Area continues to be seismically active and is located along the Calaveras and Hayward fault lines, both of which are known for frequent minor tremors.
Where is San Ramon located?
San Ramon is a city located in Contra Costa County, California – in the Ramon Valley, about 35 miles east of San Francisco in the East Bay Area. The area is also home to major companies such as Chevron and SAP.
Meanwhile, a magnitude 6.0 earthquake struck Susitna, Alaska, on Thanksgiving Day in November.
The quake struck at 8:11 a.m., about 26 miles southwest of Willow and roughly 37 miles from Anchorage, according to the Alaska Earthquake Center.
The United States Geological Survey (USGS) recorded the earthquake at a shallow depth of 42.8 miles (69 km). More than 4,600 Alaskans reported feeling the tremors, according to the “Did You Feel It” page on the USGS website.
The strongest earthquakes in southern Alaska are typically caused by the megathrust fault, which marks the contact zone between the subducting Pacific plate and the overriding North American plate.
On average, Alaska experiences about half a dozen earthquakes of magnitude 6 or greater each year. Communities along the coast also faced the additional threat of tsunamis, triggered by either earthquakes or landslides.