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The Cascadia subduction zone is a 960 km (600 mi) fault at a convergent plate boundary, about 100–200 km (70–100 mi) off the Pacific coast, that stretches from northern Vancouver Island in Canada to Northern California in the United States. It is capable of producing 9.0+ magnitude earthquakes and tsunamis that could reach 30 m (98 ft).
The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26, 1700, with an estimated moment magnitude of 8.7–9.2. The megathrust earthquake involved the Juan de Fuca Plate from mid- Vancouver Island, south along the Pacific Northwest coast as far as northern California. The plate slipped an average of 20 meters (66 ...
A silent colossus lurks off the Pacific coast, threatening hundreds of miles of coastline with tsunamis and devastating earthquakes. For decades, scientists have warned about the potential of the ...
Tsunami waves would batter the coast for 10 hours. Inland hillsides would liquify, taking out roads and bridges. Some 620,000 buildings would be critically damaged or collapse, including an ...
The resulting tsunami approaches the US coast between 6–8 hours after the collapse, in a north-to-south fashion. [71] Waves grow due to shoaling as they approach the continental shelf [ 72 ] but later decline due to increased bottom friction [ 73 ] and eventually reach heights of 3–10 metres (9.8–32.8 ft) when they come ashore.
At 6:09 a.m. on Jan. 15, the National Weather Service issued a tsunami advisory for the entire West Coast because of a volcano that erupted in the Pacific Ocean.
In some regions, tsunami sirens are used to help alert the public. The Pacific Tsunami Warning Center (PTWC), located on Ford Island, Hawaii, is one of two tsunami warning centers in the United States, covering Hawaii, Guam, American Samoa and the Northern Mariana Islands in the Pacific, as well as Puerto Rico, the U.S. Virgin Islands and the British Virgin Islands in the Caribbean Sea.
National Tsunami Warning Center. The National Tsunami Warning Center (NTWC) is one of two tsunami warning centers in the United States, covering all coastal regions of the United States and Canada, except Hawaii, Guam, the Northern Mariana Islands, Puerto Rico and the U.S. Virgin Islands. Until 2013, it was known as the West Coast and Alaska ...