Earthquake swarm hits SoCal with 1,000 shakers in a less than 1 square mile

It’s a reminder the ground in California is alive.

A flurry of more than 1,000 small earthquakes has rattled Southern California over the past three weeks.

The quakes have occurred in an area covering less than a square mile in San Bernardino and Riverside counties roughly 40 miles east of downtown Los Angeles.

The United States Geological Survey map depicting the uptick in seismic activity shows a thick collection of dots, a rather unsettling sight.

ALSO: California is in an earthquake drought, new research says

Experts say earthquake swarms are typical in a state crisscrossed by active faults, but anytime they happen, Californians begin to wonder, is the Big One coming?

“I would redefine normal as: You should still be prepared for a large earthquake,” USGS research geophysicist Andrea Llenos told the LA Times. “We do know a big earthquake is going to happen.”

But no one knows when and where.

The swarm started at the end of May and has mostly included small quakes people in the area can’t even feel, but there have been two magnitude 3.2 shakers, two 3.0 and one 3.1.

This post was originally posted at https://www.sfgate.com/bayarea/article/Earthquake-swarm-hits-California-with-1-000-14017449.php.

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