The tiny Juan de Fuca plate is largely responsible for the ... A mid-ocean ridge would then mark the boundary between the plates. Mountains and a rift can be seen along the San Andreas Fault.

New research shows that in minutes after the earthquake hits, coastal areas of California, Oregon and Washington could drop ...

An ocean bottom seismometer being retrieved after spending 10 months on the floor of the Pacific Ocean to map the mantle 100 miles underneath the Juan de Fuca plate. Disclaimer: AAAS and EurekAlert!