found: Wikipedia, Sept. 13, 2011 (1700 Cascadia earthquake was a magnitude 8.7 to 9.2 megathrust earthquake that occurred in the Cascadia Subduction Zone on January 26, 1700. At 9 P.M. on January 26, 1700 one of the world’s largest earthquakes occurred along the west coast of North America. A tsunami is a series of waves, not just a single wave.
The Cascadia subduction zone could deliver the worst earthquake in North America. The Cascadia subduction zone could deliver the worst earthquake in North America. In the open ocean, tsunami waves can travel at speeds up to 500 miles an hour, as fast as a … They had no way knowing that the tsunami had been spawned during an earthquake along the coast of northwestern North America. The Last Cascadia Great Earthquake and Tsunami; 313 Years and Ticking. The 1700 Cascadia Earthquake was a magnitude 8.7 – 9.2 megathrust earthquake that occurred in the Cascadia subduction zone in 1700.
Thousands of coastal residents settled in for the night on January 26th 1700 when the ground began to shake. The question is when. The earthquake involved the Juan de Fuca Plate underlying the Pacific Ocean, from mid-Vancouver Island in southwest Canada off British Columbia to northern California, along the Pacific Northwest coast. The lost cataclysm: The Cascadia earthquake and tsunami of 1700. It likely broke at least 1,000 kilometers of the boundary between the subducting Juan de Fuca Plate and the overriding North America Plate—a rupture about as long as California, or about the length of Japan’s main island, Honshu. "The 1700 Cascadia earthquake probably was such a giant.  Past earthquake rupture models used to explain paleoseismic estimates of coastal subsidence during the great A.D. 1700 Cascadia earthquake have assumed a uniform slip distribution along the megathrust. It runs 700 miles underwater along Pacific Northwest, from Canada to California.
The undersea Cascadia thrust fault ruptured along a six-hundred-mile length, from mid-Vancouver Island to northern California in a great earthquake, producing tremendous shaking and a huge tsunami that swept across the Pacific. Some noted that no parent earthquake had been felt; they were wondering what had set off the waves. Tsunami generated by a ~9.2 magnitude Cascadia earthquake in 1700 along a 600 mile long fault from Vancouver Island, British Columbia to northern California. For most, the first signs were subtle, dogs barked nervously as the primary or “P” wave vibrations passed by. 1700: A massive earthquake strikes the Pacific Northwest coast, sending a tsunami racing across the ocean all the way to Japan. The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26 with an estimated moment magnitude of 8.7–9.2.