When a magnitude 6.0 earthquake hit Napa in 2014, an earthquake alert system gave researchers in San Francisco about eight seconds of warning before the shaking began. Just last month, 30 seconds of warning reached downtown L.A. before the ground shook from a magnitude 4.4 quake centered near Banning.
...via L.A. Times - Science http://ift.tt/1PVxHiT
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