![]() Warnings produced by the ShakeAlert system are also pushed through the same wireless notification system that issues Amber Alerts.Īfter years of sluggish progress in developing the early-warning system, Gov. It uses numerous seismic stations to detect the start of an earthquake and rapid communications to send the data to computers that instantly calculate location, magnitude and intensity of shaking, creating alerts for distribution to areas within the quake zone. ![]() The system alerts people a few moments before a quake can be felt so they can prepare. USGS calculates that California has a 99.7% chance of being struck by at least a 6.7 magnitude earthquake within the next 30 years. ![]() Many people will feel a quake with a level-three shaking intensity, according to researchers. The phone app warns users to “drop, cover, and hold on” if they are likely to experience shaking intensity of at least three out of a maximum 10 in a magnitude 4.5 or higher earthquake.
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