Cascadia Megathrust Earthquake Could Trigger San Andreas Fault

Cascadia megathrust earthquake could trigger San Andreas fault

When the tectonic subduction zone beneath the Pacific Northwest moves, it does so in dramatic fashion. Not only is ground shaking from a magnitude 9+ earthquake incredibly destructive, the event triggers tsunamis and landslides to compound the damage. Now, a new study in the Geosphere suggests the "really big one" could also trigger a major earthquake in California.