A new origin story for deadly Seattle fault

The Seattle fault zone is a network of shallow faults slicing through the lowlands of Puget Sound, threatening to create damaging earthquakes for the more than four million people who live there.

California quake occurred in very seismically active region

The big earthquake that rocked the far north coast of California on Tuesday originated in an area under the Pacific Ocean where multiple tectonic plates collide, creating the state's most seismically active region.

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