LOS ANGELES, CA - MARCH 21: California Integrated Seismic Network's Earthquake Ready Warning Demonstration System displays an alarm on a large screen inside the Los Angeles County Emergency Operations Center before a simulated magnitude 7.0 aftershock following a simulated 7.8 magnitude earthquake during a functional exercise at the Los Angeles County Emergency Operations Center (CEOC) hosted by The County of Los Angeles Office of Emergency Management on March 21, 2013 in Los Angeles, California. The training exercise featured the California Integrated Seismic Network's Earthquake Ready Warning Demonstration System, which included 88 cities, 137 unincorporated communities, 200 schools and several nonprofit organizations. (Photo by Kevork Djansezian/Getty Images)
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