An Elusive Gravity Signal Could Mean Faster Earthquake Warnings

Seismic waves from a big quake are easy to see—think of the classic image of a seismograph, pencil scratching out telltale waves on a rotating paper as the tremor arrives. Even to highly trained eyes, PEGS are just squiggles, indistinguishable from the noise. It’s hard to prove they’re there. In 2017, early identifications of PEGS in Tohoku seismic data received pushback from other seismologists.

But over time, researchers have collected more observations from earthquakes around the world. “I’ve managed to convince myself that the theory is

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