Cascadia Subduction Zone
subduction — 1,000 km
The Cascadia Subduction Zone is a 1,000 km megathrust fault stretching from northern California to British Columbia. Its last full rupture in 1700 produced a M9.0 earthquake and a tsunami that reached Japan. It is considered overdue for another major event.
Type
subduction
Length
1,000 km
Countries
2
Linked Cities
3
Last Major Earthquake
M9 — Pacific Northwest Coast (1700-01-26)
Affected Countries
Cities Near This Fault
General tectonic context only—not a site-specific hazard assessment. Live event data: USGS Earthquake Hazards Program.