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Structure of the Cascadia subduction zone. The Cascadia subduction zone is a 1,000 km (620 mi) long dipping fault that stretches from Northern Vancouver Island to Cape Mendocino in northern California. It separates the Juan de Fuca and North America plates. New Juan de Fuca plate is created offshore along the Juan de Fuca Ridge. [8] [9]
A Wadati–Benioff zone (also Benioff–Wadati zone or Benioff zone or Benioff seismic zone) is a planar zone of seismicity corresponding with the down-going slab in a subduction zone. [1] Differential motion along the zone produces numerous earthquakes , the foci of which may be as deep as about 670 km (420 mi).
Within the portion of North American crust overlying the Gorda slab, motion on faults is reverse, and in April 1992, a M 7.1 earthquake ruptured the southern portion of the Cascadia subduction zone. Similar to the general seismicity patterns in the region, the majority of the aftershocks for this event had vertical strike-slip motions and were ...
The Cascadia subduction zone intersects the San Andreas fault at the Mendocino triple junction. It has been hypothesized that a major earthquake along the Cascadia subduction zone could trigger a rupture along the San Andreas Fault. [2] [3] [4] In the south, the fault terminates near Bombay Beach, California, in the Salton Sea.
To map the subduction zone, researchers at sea performed active source seismic imaging, a technique that sends sound to the ocean floor and then processes the echoes that return. The method is ...
West of Central America: Subduction zone: Active: 1982 El Salvador (M7.3), 1992 Nicaragua (M7.7) Nankai Trough: 900: South of Honshū, Japan: Subduction zone: Active: see Nankai megathrust earthquakes: Neodani Fault: Japan: Oblique-slip: Active: 1891 Mino–Owari (M8.0) New Madrid Fault Zone: Missouri, United States: Normal fault: Active: 1811 ...
Scientists say that the Cascadia subduction zone off the coast of the Pacific Northwest has the potential to spark a magnitude-9.0+ earthquake, plus a subsequent tsunami. That scenario last ...
Megathrust earthquakes are almost exclusive to tectonic subduction zones and are often associated with the Pacific and Indian Oceans. [5] These subduction zones are also largely responsible for the volcanic activity associated with the Pacific Ring of Fire. [12] Since these earthquakes deform the ocean floor, they often generate strong tsunami ...