California Gov. Gavin Newsom is set to unveil the state’s new earthquake early warning app, MyShake. Here's what you need to know:
Here are some estimates, according to Richard Allen, director of the Berkeley Seismology Lab:· San Jose: A few secondsThe farther you are from the epicenter, the more warning time you’d probably have. San Francisco is 60 miles away from the epicenter of the 1989 earthquake, which was in the Santa Cruz Mountains.
When an earthquake of magnitude 4.5 or greater hits, computers instantly analyze what areas of the state are expected to see an intensity of shaking described as “felt quite noticeably by persons indoors, especially on upper floors of buildings,” and causing standing cars to rock slightly, with many people thinking the vibrations are similar to a truck passing by.. If you’re in a zone that’s forecast to get this level of shaking, the system is designed to give you an alert on the MyShake app.
In that case, warnings will go out only to people in places where intensity Level 4 shaking is expected. That’s a level of shaking described as “light,” in which many are aware of the shaking, walls make cracking sounds, and doors and windows and dishes are disturbed.You should expect there will be false alarms and missed alarms. That’s part of the deal with earthquake early warnings when they’ve operated in countries like Japan and Mexico.
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