Southern California's Jurupa Valley has recently been rattled by a 'swarm' of more than 400 small earthquakes since May 25, according to the USGS. There's no need to panic, according to seismologists and geophysicists.
Since May 25, 432 quakes have hit the area that only spans a few square miles, the US Geological Survey reported Monday.The quakes, as a whole, have measured 0.8 to 3.2 in magnitude and only a few have been significant enough to be felt, USGS seismologist Robert Graves said. There's no need to panic, according to seismologists and geophysicists.
"That zone is a place of weakness and that's what's causing these small earthquakes to occur," he said. "Large earthquakes occur on large faults," he said. For example, Graves said a magnitude 7 earthquake would have a fault length of about 30 miles and a magnitude 8 earthquake would have a fault length of 250 to 300 miles. The area where the swarm hit is only a few square miles. There have been a couple of other swarms in the Jurupa Valley area.
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