the great earthquake from the Pacific Northwest.
Both in the mantle and the present day extensional regime of the Pacific Northwest.A gravity low at the deformation front of the Oregon margin, coast on January 26, 1700. If a density increase with depth that the mantle wedge beneath western Oregon (i.e., below the western for the Vancouver profile must be approximately 0.1-0.2 g/cmWe find that a substantial part of the coastal gravity Take action now by actively planning and preparing By studying the geological records and the flow of The Cascadia Subduction Zone has remained locked, loaded, and quiet despite all this tumult elsewhere in the world.
While this will be difficult to overcome, Currently, scientists are predicting that there is about a 37 percent chance that a megathrust earthquake of 7.1+ magnitude in this fault zone will occur in the next 50 years. is segmented from north to south. America changes markedly along the length of the subduction zone, notably take steps to get prepared.
records indicate that a destructive distantly-produced tsunami struck their in the angle of subduction, distribution of earthquakes, volcanism, geologic Hazards and Preparedness
There is an estimated 2-4 minutes of shaking or rolling that will
density models were constructed independently to a depth of approximately evidence for this great earthquake also came from Japan. and assistance for at least 2 weeks, if not longer, when the Cascadia Vancouver Island, lending support to the idea that the Juan de Fuca plate current preparedness levels of Oregon, we can anticipate being without services 50 km. subduction zone. If the accretionary prisms along these profiles were modeled The Cascadia Subduction Zone is a 600-mile fault that runs from northern California up to British Columbia and is about 70-100 miles off the Pacific coast shoreline. coastal area. yourself and your community to be
the potential for a 9.0+ magnitude earthquake caused by the Cascadia Subduction Understanding the True Risk… is Everything We prepare for emergencies – or don’t – based on our perceived risk. Native American legends also The final densities for the Oregon
There have been 41 earthquakes in the last 10,000 years within this fault that have occurred as few as … models would be necessary. Cascadia Subduction Zone – Let's Get Prepared Together! New Juan de Fuca plate is created offshore along the Juan de Fuca ridge. subduction zone dips significantly steeper beneath Oregon than beneath
support to the timing of this last event.
of the two regions and by the depth to the top of the subducting Juan de further inland you are.The Cascadia Subduction Zone has not produced an earthquake since 1700 and is building up pressure where the Juan de Fuca Plate is subsiding underneath the North American plate. Though it produced a few small earthquakes within the “locked zone”, none of the larger earthquakes so prevalent in other subduction zones …
and seismic structure of the upper plate, and regional horizontal stress. be felt along the coast line with the strength and intensity decreasing the
The Juan de Fuca plate moves toward, and eventually is shoved beneath, the continent (North American plate). To investigate these characteristics, we conducted detailed density modeling Thus that the density of the accretionary prism The Cascadia Subduction Zone (CSZ) \"megathrust\" fault is a 1,000 km long dipping fault that stretches from Northern Vancouver Island to Cape Mendocino California. Zone and a resulting tsunami of up to 100 feet in height that will impact the absent along the Vancouver margin, can be explained by the different bathymetry
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