Snow and rain tug on earthquake faults in California

Seasonal changes in water weight can set off small tremors

Sierra Nevada mountains

ON THE REBOUND  Weighed down with water during wet winters, California’s northern mountain ranges — like the Sierra Nevada, shown — rebound during dry summers. This seasonal flexing leads to an uptick in small quakes along some faults, new research finds.

Bill_Dally/iStockphoto

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