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Swarm Of Earthquakes Leaves Scientists On Edge For Something Much Bigger

(Marty Melville/AFP via Getty Images)

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The U.S. Geological Survey said in a statement Monday that a swarm of small earthquakes in California was being closely monitored over concerns of a larger event on the San Andreas fault.

The roughly 20 earthquakes took place Monday morning under the southeastern part of the Salton Sea, according to the U.S. Geological Survey. The swarm began with a magnitude 3.2 earthquake before a number of magnitude 4 earthquakes struck. The largest earthquake was a magnitude 4.6 and took place near Bombay Beach, California.

“During this earthquake swarm, the probability of larger earthquakes in this region is significantly greater than usual,” the statement read.

Earthquake swarms of similar magnitudes have only occurred four times in the 88 years of modern geological records available for southern California, the Los Angeles Times reported. Seismologists expressed concern that the San Andreas fault could possibly rupture and produce a higher magnitude earthquake. (RELATED: Nevada Hit By 6.5 Magnitude Earthquake)

The San Andreas Fault is considered to be one of the most dangerous in the world and stretches around 750 miles between the Pacific and North American tectonic plates, according to Newsweek. Major cities like Los Angeles, San Francisco and San Diego are located along the fault line.

There has not been a rupture along the southern part of the San Andreas fault in more than 300 years. Larger earthquakes tend to occur in the region every 250 years on average, according to the Los Angeles Times.

The U.S. Geological Survey calculated there was an 80% chance that the earthquake swarm continues until August 18, according to the agency’s statement Monday. Moderately large earthquakes between magnitudes 4.5 and 5.4 were likely to occur within the next several days.

PARKFIELD, CA - SEPTEMBER 30: The Parkfield Coalinga bridge crosses over the San Andreas fault on the Parkfield Coalinga Road on September 30, 2004 Parkfield, California. The tiny central California town with a population of 19 which claims to be known as "The earthquake capital of the world" was hit with a 6.0 earthquake on Tuesday September 28, 2004. (Photo by David Paul Morris/Getty Images)

The Parkfield Coalinga bridge crosses over the San Andreas fault (David Paul Morris/Getty Images)

The agency calculated there was a 19% chance that an earthquake between magnitudes 5.5 and 6.9 would occur. There was a 1% chance that an earthquake of magnitude 7 or higher would occur. (RELATED: Here’s Why Alaska’s Magnitude 7.1 Quake Was So Big)

Scientists have raised concern that the region is overdue for a megaquake, according to Newsweek. The region last saw a similar event in 1906 when a magnitude 7.9 earthquake in San Francisco killed more than 3,000 people and left 225,000 displaced.

A U.S. Geological Survey simulation concluded that a hypothetical megaquake would kill 1,800 people, injure 5,000 and displace between 500,000 to 1 million, the Los Angeles Times reported.