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A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
Studies of past earthquake traces on both the northern San Andreas Fault and the southern Cascadia subduction zone indicate a correlation in time which may be evidence that quakes on the Cascadia subduction zone may have triggered most of the major quakes on the northern San Andreas during at least the past 3,000 years or so. The evidence also ...
On Jan. 26, 1700, an earthquake on the Cascadia fault caused the forest to lurch downward by more than 3 feet. Soon after, a tsunami perhaps 100 feet high barreled through at 20 or 30 mph.
Recent findings conclude that the Cascadia subduction zone is more complex and volatile than previously believed. [18] In 2010, geologists predicted a 37% chance of a magnitude 8.2+ event within 50 years, and a 10% to 15% chance that the entire Cascadia subduction zone will rupture with a magnitude 9+ event within the same time frame.
The most prominent red line is the San Andreas fault (overall probability of rupture ~70%). The red zone at the northwest corner is the southern end of the Cascadia subduction zone, that on the California-Nevada state line is Walker Lane. Modified from UCERF-2 figure 35.
Off the coast of Oregon and Washington, a smaller plate called the Juan de Fuca is slowly being dragged underneath the North American, creating a giant fault known as the Cascadia Subduction Zone ...
The Cascadia subduction zone is capable of producing megathrust earthquakes on the order of MW 9.0. Due to the relative plate motions, the triple junction has been migrating northwards for the past 25–30 million years, and assuming rigid plates, the geometry requires that a void, called slab window , develop southeast of the MTJ. [ 4 ]
A newly found fault line with a rare slanted angle shows why an earthquake rattled New York City in April harder than its epicenter in New Jersey — and may be a bigger seismic activity threat ...