Geology and the Quileute Nation the geology is actually even more dynamic than this suggests. The very small Juan de Fuca plate, diverging from the Pacific plate, is being rapidly subducted under the North American land mass about 80 km (50 miles) off the coast of Washington state. This shallow subduction creates tremendous friction, generating earthquakes in the region, as well as volcanoes in the Cascade mountain range like Mt. Rainier and Mt. St. Helens.
Nature's restless earthquakes - Surface fault rupture for the September 2010 Mw = Canterbury earthquake in New Zealand. Included was this one, taken of a railway line that crossed the fault rupture at the eastern end of the fault near to Rolleston.
Any parent of a rambunctious youngster can tell you trouble might be afoot when things go quiet in the playroom. Two independent research initiatives indicate there is a comparable situation with the Cascadia earthquake fault zone. The fault zone expected to generate the next big one lies underwater between 40 and 80 miles offshore of the Pacific Northwest coastline. Earthquake scientists have listening posts along the coast from Vancouver Island to Northern California. But those onshore…
A study of the magnitude-7.7 earthquake that shook the northern coast of British Columbia, Canada, last October has [shown that] even Pacific islands as far away as Hawaii might need to worry about tsunamis originating from this part of the Canadian coast. - Most of the tsunami threat in North America's Pacific Northwest stems from the Cascadia fault, where the Juan de Fuca crustal plate dives beneath Washington, Oregon, and parts of California and British Columbia.