The activation of the U.S. Geological Survey’s ShakeAlert system is the second time in six weeks that Bay Area residents got a warning before they felt shaking. More than 2.1 million earthquake alerts were issued to users.
In addition, more than 420,000 alerts were issued during a magnitude 4.4 earthquake on Sept. 13, which struck beneath Santa Rosa.MyShake is the early-warning app recommended for Southern Californians. But there are others you can download. What are they and which ones might you want?
“Both earthquakes have demonstrated that we can get out a massive number of alerts in a short period of time,” De Groot said. Of the 2.1 million devices that got an early warning Tuesday, it was not immediately clear how many received alerts before the shaking started in their location, compared with devices that were activated as the shaking began or even after it had ended. Getting that answer will require more analysis.
Still, based on social media postings, many people said they got several seconds’ notice before they felt the quake, including people in San Jose, San Francisco, Oakland and Berkeley. Shaking waves travel at the speed of sound traveling through rock, which is slower than the speed of today’s telecommunications services. That enables people farther from the epicenter of an earthquake to get a warning that shaking is coming in a matter of seconds.
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