California's earthquake early warning system passes major test

California's earthquake early warning system passes major test: Sensors gave 30 seconds' warning before Monday's desert temblor was felt at Caltech. Scientists hope to get funds to expand the pilot project into a statewide network.

In the seismic annals of California, Monday's magnitude 4.7 earthquake was little more than a footnote. It gave Southern California a small morning jolt but caused no damage and was largely shrugged off by noon.

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