A subduction zone is created where two plates converge, with one sinking into the mantle. Dynamics along the plate interface create earthquakes, magma generated above the sinking slab leads to ...

A megasplay fault branches upward from the subduction zone, and in the event of "The Big One," would raise the seafloor, displacing a massive amount of water closer to the coast.

Block diagram showing subduction of the Juan de Fuca Plate beneath the North American Plate along the Cascadia Trench, which is the western edge of the Cascadia subduction zone.

Spectacular 3D seismic-reflection images of a subduction zone. ... This next one is a perspective block diagram beautifully showing both cross-sectional and map views of the accretionary wedge.

The Cascadia Subduction Zone is a 620-mile-long fault that stretches from British Columbia to Northern California, and pressure is building daily.