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The 'Holy Grail' for earthquake scientists has been accidentally destroyed

The 'Holy Grail' for earthquake scientists has been accidentally destroyed

For nearly half a century, thousands trekked to Rose and Prospect streets to behold a slice of sidewalk that, by conventional standards, had no curb appeal.

Pulled apart so that it no longer aligned, the humble curb wasn’t much to look at. But for earthquake scientists, it was a kind of Holy Grail, perfectly illustrating the seismic forces at work underneath this Bay Area neighborhood.

Since at least the 1970s, scientists have painstakingly photographed the curb as the Hayward fault pushed it farther and farther out of alignment. It was a sharp reminder that someday, a magnitude 7 earthquake would strike directly beneath one of the most heavily populated...

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