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https://www.newyorker.com/tech/annals-of-technology/theres-an-earthquake-coming
ShakeAlert -- CA, OR, WA
"ShakeAlert sends out mass public warnings through third-party apps and fema's Wireless Emergency Alert system; it is set to warn about earthquakes more severe than a relatively moderate magnitude 4.5
"Android can now warn its users when the ground beneath their feet is about to start shaking.
E.E.W. allows seismologists to estimate, in real time, the potential amount of shaking an earthquake will cause. The principles are relatively simple. Seismometers can scan the ground for the "P waves," or compression waves, which precede the slower and more powerful "S waves," or shear waves, that are responsible for severe earthquake damage, like lightning before thunder. Using the P waves, a local data-processing center can calculate the likely reach and magnitude of a quake moments after it begins. The resulting alert, dispatched at the speed of light, usually beats the S waves, which ripple through rock at about two miles per second.
ShakeAlert -- CA, OR, WA
"ShakeAlert sends out mass public warnings through third-party apps and fema's Wireless Emergency Alert system; it is set to warn about earthquakes more severe than a relatively moderate magnitude 4.5
"Android can now warn its users when the ground beneath their feet is about to start shaking.
