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Anon-earthquake event triggered the USGS ShakeAlert system, which dozens of people across the county reported feeling, despite it not being an earthquake. The U.S. Geological Survey (USGS) issued a statement via Twitter: Hi everyone - #ShakeAlert detected a non-earthquake event which triggered our system. Fortunately, no public alerts were sent out. This is a bit of a first time for us because these events happen so rarely. Apologies for any confusion from our previous tweets. — USGS ShakeAlert (@USGS_ShakeAlert) April 15, 2022 The USGS said they are investigating the cause of the non-earthquake event, and also tweeted they're improving the...

May 05, 2003 Earthquake Warning System Sounds Alarm Seconds before Tremors BeginMost seismologists agree that predicting earthquakes days in advance is not going to be possible anytime soon. But borrowing from a system developed in Japan, scientists have devised an early warning system that will alert southern California residents seconds before a temblor begins. When an earthquake strikes, the first pulse of energy to radiate from the point of origin comprises primary (p) waves. P waves travel about two times as fast as the secondary (s) waves that follow them and that carry the destructive, ground-shaking power characteristic of...