Fault along L.A., O.C. coast could unleash huge earthquake on scale of San Andreas, study shows

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Fault along L.A., O.C. coast could unleash huge earthquake on scale of San Andreas, study shows
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Known as the Palos Verdes fault zone, the system runs deep beneath the Palos Verdes Peninsula. It previously was thought to be a segmented network of smaller faults, but a closer look by scientists suggests it’s a system of interconnected.

that struck in 2019, said John H. Shaw, a professor of structural and economic geology at Harvard University and one of three authors of the new study.

“Rather than one line in the map, we could see a rupture [series] that could occur in a wide area,” Shaw said of a major quake along the Palos Verdes fault zone. Aftershocks would be like falling dominoes, he said. Oil studies can be helpful to earthquake scientists because they offer insights into how the Earth looks below the surface, where earthquake faults lie.

The study, published by the Bulletin of the Seismological Society of America, also found the Palos Verdes fault slips at a much faster rate than most active fracture zones in Los Angeles County, moving 1 to 6 millimeters a year. More than 50 active faults run under L.A. County, and the majority move 1 millimeter or less annually, Shaw said.

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