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October 19, 2019 01:30 am

California Launches First Statewide Earthquake Early Warning System

hcs_$reboot writes: Everyone in California will now receive earthquake alerts on their phones seconds before the ground begins to shake, giving residents up to 20 seconds of warning before shaking begins. Developed by seismologists at the University of California, Berkeley, the MyShake application (residents will need to download the app to receive the alerts in areas without cell phone coverage) is designed to alert the public when a magnitude 4.5 earthquake or greater has been detected and has been shown to be faster than other alert delivery methods. The wireless emergency alerts will be sent in the event of a more significant quake, magnitude 5.0 or greater. The system does not predict earthquakes. Rather, it uses numerous seismic stations to detect the start of an earthquake and light-speed communications to send the data to computers that instantly calculate location, magnitude, intensity of shaking and create alerts to be distributed to areas that will be affected. When the MyShake app was released back in 2016 it already detected over 200 earthquakes in more than ten countries. A paper describing the early results gives a general idea of the app's success: "On a typical day about 8,000 phones provide acceleration waveform data to the MyShake archive. The on-phone app can detect and trigger on P waves and is capable of recording magnitude 2.5 and larger events. The largest number of waveforms from a single earthquake to date comes from the M5.2 Borrego Springs earthquake in Southern California, for which MyShake collected 103 useful three-component waveforms. The network continues to grow with new downloads from the Google Play store everyday and expands rapidly when public interest in earthquakes peaks such as during an earthquake sequence."

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