A hidden chunk of an ancient tectonic plate is stuck to the Pacific Ocean floor and sliding under North America, complicating ...
A hidden shard of ancient crust has been detected where California’s San Andreas system collides with the Cascadia subduction ...
An earthquake swarm hit the San Francisco Bay Area on Sunday morning. The cluster of up to eight quakes, ranging from 2.5 to 3.8 on the Richter scale, first occurred from 9:38am to 9:41am around ...