More than two weeks of 400 earthquakes occurred near San Francisco

The city of San Ramon in California broke the record for the number of earthquakes in a two-week period. A total of 408 small earthquakes occurred in the city, which is located in the eastern part of the San Francisco Bay Area.

The previous record set there in the same year 2003, surpassed almost four times. Then the city took over 120 earthquakes for a month. San Ramon is located in 45 miles from San Francisco.

“This was the first time I felt such tremors,” says local resident Mark Stone.

According to US Geological Survey, at least a dozen pushes were recorded on Monday, a few dozen on Tuesday, when an 3,2 magnitude earthquake hit this area. The magnitude of the remaining earthquakes varies from two to three.

Bay Area's Earthquake Map shows all the shocks that have been recorded in the San Francisco Bay area in the last 24 hours.

Senior Scholar of the US Geological Survey David Schwartz told in one of interviewthat San Ramon was at the epicenter of seismic activity in the Bay Area.

In 2003, the most powerful push was recorded with a magnitude of 4,2. And in 1990, in the nearby Alamo, located in 30 miles from San Francisco, an 351 earthquake hit 42 of the day (the maximum magnitude is 4,4).

The current swarm of earthquakes - more than 400 - surpasses both of these indicators. According to the US Geological Survey, shocks occur at a depth of about five miles underground and are too weak to be felt.

A swarm of earthquakes in San Ramon, Alamo and Danville are not uncommon, since these cities are located on the Kalaveras fault, which is part of the San Andreas fault between the Pacific and North American plates, passing along the coast through California.

Experts believe that the tremors can last for several more weeks, but they are unlikely to be harbingers of a large earthquake. The probability of an earthquake of magnitude 6,7 and higher in the northern part of the Kalaveras fault is only eight percent.

At the end of January, as Forum reported, tremors 5,7 magnitude occurred off the coast of california. The epicenter of the earthquake was located in 41 kilometer south-west of the village of Ferndale.