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An L.A.-area fault looked dormant. Turns out it can cause a 6.4-magnitude quake, study says.

Scientists thought the Wilmington blind‐thrust fault that runs deep under the Los Angeles region had been dormant since the Late Pliocene era, millions of years ago. But a new study reveals that it’s very much alive, and capable of generating the kind of 6.4-magnitude earthquakes that could cause serious damage in such a populous area.
The devastating 1994 Northridge earthquake was also caused by a blind-thrust fault, which are not visible from the surface, and registered a 6.7, within the range of what researchers estimate the Wilmington blind‐thrust fault could generate on its own.

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