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> Developed by the nation’s leading seismologists, the ShakeAlert system uses signals from more than 700 seismometers installed across the state by USGS, Cal OE
by hinoki 5y ago
> Developed by the nation’s leading seismologists, the ShakeAlert system uses signals from more than 700 seismometers installed across the state by USGS, Cal OES, University of California Berkeley, and the California Institute of Technology.
They just send notifications to the phones if there is an earthquake. They don’t use the phones themselves as a sensor.
- Rebelgecko 5y ago>All smartphones come with tiny accelerometers that can sense signals that indicate an earthquake might be happening. If the phone detects something that it thinks may be an earthquake, it sends a signal to our earthquake detection server, along with a coarse location of where the shaking occurred
- tejtm 5y agoHere in the PNW the one(s) we tend to worry about most will be close in but offshore where the sea floor dives under the continental plate. Buoys can be close to the source and transmit fast enough to give some of us a minute or two warning thanks to the wave propagation speed difference between radio in the air and P & S waves through the earth.