California's earthquake early warning system passes major test

Some might believe that the 4.7 magnitude Riverside County temblor that rattled windows and swayed skyscrapers across Southern California on Monday morning released tension from the San Jacinto fault, thereby avoiding danger of a larger earthquake.But in one important way, the quake was highly significant because it marked an advance in California's burgeoning earthquake early warning system. The quake struck in the desert town of Anza, about 35 miles south of Palm Springs, and hundreds ofBut in one important way, the quake was highly significant because it marked an advance in California's burgeoning earthquake early warning system. The quake struck in the desert town of Anza, about 35 miles south of Palm Springs, and hundreds ofOn March 11, 2011, a 9.0-magnitude earthquake rocked northeast Japan. The earthquake triggered devastating tsunamis, which in turn set off the worst

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