How You Could Get an Early Warning for the Next Big Quake

At 2:39 am Thursday morning, millions of Bay Area residents from Sacramento to San Jose were shaken awake by the rolling tremble of a 4.4 magnitude earthquake. The eight-mile deep tremor struck along the Hayward fault, two miles southeast of Berkeley. From my apartment just 20 blocks from the epicenter, I woke with the rest of the neighborhood and rode out the wake from bed for about 10 seconds.

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