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When an earthquake starts, it generates these seismic waves called primary high frequency waves or P-waves that travel super fast and secondary movement waves or S-waves that come with potential damage.
Earthquake early warning systems work by detecting those initial P-waves and quickly estimate the earthquake's location, magnitude, and intensity, sending alerts before the more destructive S-waves arrive at the surface.
It's those same P-waves, which we can hear as rumbles in the ground before the shakes start.
I appreciate that explanation! I was just having fun with your choice of punctuation and attributing "a telltale sign of a coming earthquake" with the phone warning.
I commented for the chuckle and got an interesting explanation instead!