How nervous should we be? Swarm of 1,000 earthquakes in Southern California #swarmageddon

 

The seismic storm that unleashed more than 1,000 small earthquakes in San Bernardino and Riverside counties these last three weeks elicited what has become a typical reaction in quake country.

To some, the “swarmageddon” 40 miles east of downtown Los Angeles brought fear that a bigger threat was coming. To others, as long as they didn’t feel a shake, it was easy to just put it out of their minds.

California has small quakes all the time — a magnitude 3 every other day, on average. But not all of them act the same, and some bring more danger than others.

As officials install more seismic sensors as part of the state’s early warning system, experts are getting an increasingly better look at California’s smaller earthquakes.

There is general agreement that the recent swarm probably isn’t a precursor to a catastrophic quake. But other small quakes — especially ones near major fault lines like the San Andreas — are potential warnings.

“I would redefine normal as: You should still be prepared for a large earthquake,” U.S. Geological Survey research geophysicist Andrea Llenos said. “We do know a big earthquake is going to happen” — just not when and where. Read More here:

A swarm of 1,000 earthquakes hit Southern California — how nervous should we be?

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