Video: So. Cal. earthquakes a precursor?

  1. Closed captioning of: So. Cal. earthquakes a precursor?

    one reason: anyone in southern california , or if you live there yourself, then you know there have been a cluster of over 400 mostly minor earthquakes, just over the last few days. it has a lot of people on edge, and the rest of us wondering why, and what's next. our report from there tonight from nbc's mike taibbi .

    >> oh, gosh.

    >> reporter: in the digital age you knew there'd be home video .

    >> our house is coming down. the house is coming down.

    >> reporter: this house in rawley, california , about 125 miles east of san diego , did not come down, none did but some 400 earthquakes over a several-hour period sunday did cause minor damage to scores of homes and buildings and even caused one hospital to evacuate its patients when power was lost. as predicted by a prototype early warning tech at caltech seismological lab, just about all of the shakers were relatively minor with a magnitude 3.0 range with a few just over 5.0.

    >> we were doing well estimating the magnitude of the earthquakes.

    >> reporter: say the words earthquake and california in the same sentence and the locals start worrying about how much they might lose.

    >> i was literally watching it and the pieces of the wall were falling.

    >> reporter: while the rest of the country aware of the history befalls to the obvious question. does this suggest any connection at all to the big one?

    >> and the answer is no. this earthquake is just happening too far south from the san andreas . we've seen many such swarms in rawley over the last century, never followed by something on the san andreas .

    >> reporter: on the average california day there are around 50 barely noticeable earthquakes statewide but 400 in one day, in one spot.

    >> i don't like this.

    >> reporter: were duly noticed. mike taibbi , nbc news, los angeles .

By Staff Writer
updated 8/27/2012 9:19:04 PM ET 2012-08-28T01:19:04

A "swarm" of earthquakes that touched off Sunday morning in southern California was still rolling along Monday afternoon, registering more than 300 small to moderate quakes that could be felt from Arizona to San Diego. The swarm is unusual but not as rare as you might think.

During an earthquake swarm, an affected area experiences a rapid-fire series of temblors that are all similarly proportioned, so that no one shock emerges as the obvious source of the rest. According to Julie Dutton, a geophysicist with the U.S. Geological Survey, diffuse clusters like these are far less common than earthquakes that arrive as one big shake followed by a series of smaller aftershocks.

Dutton estimates that the USGS records about 30 to 40 notable swarms a year, compared with 20,000 to 30,000 total earthquakes. Because swarms are rooted in the same kind of plate movements and stresses that cause more traditional quakes, she thinks that a large part of the phenomenon's apparent scarcity is based on semantics.

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Swarms “are really hard to characterize," she told Life’s Little Mysteries. "It's all the same mechanisms. It's just a different way of finding equilibrium in the environment."

Where did the swarm start?
The current swarm originates just outside of the small farming town of Brawley, Calif., about 30 miles north of the state's border with Mexico. According to Dutton, swarms with magnitude ranges close to the current one arrive in that area at the rate of one or two per decade, with the most recent one hitting in 2005.

The 2005 swarm, which topped out with a 5.1-magnitude event, was surpassed by yesterday's high of 5.5, the cut-off magnitude at which seismologists expect to start seeing casualties in developed countries, according to USGS geophysicist Paul Caruso. But there have been no reported injuries from the Brawley quakes, and Caruso said Monday morning saw a considerable slowing in the area's seismic activity.

What’s going on?
The types of plate activity that might bring about a swarm as opposed to a concentrated quake are not yet well understood by scientists, and there's no way of knowing how long the current swarm will last (the 2005 swarm kept up for three weeks). But Dutton says there's no reason to believe that the Brawley swarm forebodes the arrival of a "big one."

Image: Damage from 1992 California quake, Highway 247
Southern California Earthquake Data Center
At magnitude 7.3, the Landers earthquake in June 1992 was the largest earthquake to hit Southern California in 40 years. Centered in the Mojave Desert, approximately 120 miles from Los Angeles, the earthquake caused relatively little damage for its size.

"It's not something that we can definitely discount," she said. "But typically it's not something that happens when you have a swarm like this."

In volcanically active areas, earthquake swarms often indicate imminent eruptions, Dutton said. The only potential candidates for volcanic eruptions near Brawley are the Salton Buttes, five small lava domes that flank the Salton Sea and haven't erupted in close to 10,000 years.

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