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Old 07-22-2021, 10:09 AM   #221 (permalink)
Piotrsko
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What about the app for your phone that detects small shakes via P waves? There was a theory that a swarm of below 1 magnitude shakes appear before massive events, so someone wrote a phone app to detect those and Cali gave the app away to users like the seti idle computer screensaver.

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