Cascadia Subduction Zone Map
The main purpose of this website is to help ensure you. We prepare for emergencies or don t based on our perceived risk.
Ocean Sediments Off Pacific Coast May Feed Tsunami Danger
In between large earthquakes the plate interface is not silent.
Cascadia subduction zone map
. Map of the cascadia subduction zone the cascadia subduction zone off the coast of north america spans from northern california to southern british columbia. Computer generated map digital elevation model or dem of pacific northwest both on land and offshore. This map uses bedrock one second spectral amplification sa01 values from the model developed by usgs for a specific secnario of cascadia subduction earthquake ground shaking in the pacific northwest https earthquake usgs gov eqcenter shakemap global shake casc9 0 expanded se combined with a new map of nehrp site class for oregon madin and burns 2013 and uses the soil factor relationships of boore and atkinson 2008 to calculate site dependent sa01. Photo by mustafa lazkani feb 02 2016.Red circles denote known locations of seafloor methane seeps. 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. Understanding the true risk is everything. The continental slope is the boundary between the continental north american plate and oceanic juan de fuca and gorda plates which is the cascadia subduction zone.
Detailed description the cascadia subduction zone stretches along the pacific coastline from offshore vancouver island in canada to offshore northern california. New juan de fuca plate is created offshore along the juan de fuca ridge. Structure of the cascadia subduction zone the cascadia subduction zone csz is a 1 000 km 620 mi long dipping fault that stretches from northern vancouver island to cape mendocino in northern california. There have been 41 earthquakes in the last 10 000 years within this fault that have occurred as few as 190 years or as much as 1200 years apart.
One crosses vancouver island and the canadian. Map showing the cascadia subduction zone the gorda and explorer plates are part of the larger juan de fuca tectonic plate but move in slightly different directions and can be considered sub plates. Magnitudes 4 0 7 0. Menu expanded collapsed.
It separates the juan de fuca and north america plates. It separates the juan de fuca and north america plates. The subduction of the juan de fuca plate beneath north america changes markedly along the length of the subduction zone notably in the angle of subduction distribution of earthquakes volcanism geologic and seismic structure of the upper plate and regional horizontal stress. This subduction zone can produce earthquakes as large as magnitude 9 and corresponding tsunamis.
New juan de fuca plate is created offshore along the juan de fuca ridge. Let s get prepared together. To investigate these characteristics we conducted detailed density modeling experiments of the crust and mantle along two transects across the cascadia subduction zone. 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.
How big will it be.
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