A megaquake in the Pacific Northwest could trigger a large earthquake along California's San Andreas Fault, creating an unprecedented catastrophe up and down the Pacific Coast, a new study has found.

The Cascadia Subduction Zone has been quiet for more than three centuries, but that silence is exactly what alarms the scientists who study it. Along roughly 600 miles of fault off the Pacific ...

The Carrizo Plain in eastern San Luis Obispo County contains the most strikingly graphic portion of the San Andreas Fault. Sediment cores recovered from the Pacific seafloor suggest that megathrust ...

Off the coasts of southern British Columbia, Washington, Oregon and northern California lies a 600 mile-long strip where the Pacific Ocean floor is slowly diving eastward under North America. This ...

In 1954, a powerful earthquake shook Northern California near Humboldt Bay, baffling scientists for decades. Most quakes in the region come from the Gorda Plate, but this one didn’t fit the pattern.

A "Big One" on the Cascadia subduction zone in the Pacific Northwest might trigger a similarly serious earthquake on California's San Andreas Fault, new research suggests. The findings are based on ...

The disaster caused by a predicted large earthquake in the Pacific Northwest could be compounded by shaking along the San Andreas fault in California, scientists warned. By Sarah Scoles In the world’s ...

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 ...