The shaking will be felt for hundreds of miles – from the coast all the way inland to Boise, Idaho, even to the southeast toward Sacramento in California. As one section of the sea floor drops, so will the ocean water above it creating a massive tsunami that will inundate low-lying coastal communities.11 Oct 2019
How far inland will the Cascadia earthquake reach?
Where will the Cascadia earthquake hit?
Stresses have now been building along the Cascadia subduction zone for 320 years. The most likely scenario is a southern CSZ quake, with an 8 to 8.6 magnitude off the coast of southern Oregon and northern California according to the geologists. This is over 300 miles away from Portland.
What areas will be affected by the Cascadia fault?
Called the Cascadia subduction zone, a big quake along this fault could affect the cities of Seattle, Tacoma, Portland, Eugene, Salem, and Olympia.
Will the Cascadia tsunami reach Portland?
Will a Tsunami hit Portland? No! Portland is too far from the Ocean to be in danger of a tsunami. Portland, like Salem and Eugene, is in the Willamette Valley, about 60 miles from the ocean.
How far away can a 9.0 earthquake be felt?
In a place with complex geology, every rock contact scatters and absorbs seismic energy, so that far away you'd probably feel it but not see damage or casualties. In the U.S. Midcontinent, with layer-cake geology that makes efficient wave guides, a 9.0 event would probably produce appreciable damage 565 miles away.
How long will the Cascadia earthquake last?
about 100 seconds And as if that weren't bad enough, the Cascadia fault is so extended that the resulting quake is expected to last for about 100 seconds. That's significantly longer than the duration of a typical California earthquake, and that adds to the bad news, said UW engineering professor Jeffrey Berman.
How far off the Oregon coast is the Cascadia Subduction Zone?
about 70-100 miles 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.
How deep is the Cascadia trench?
From its surface trace offshore to a depth of possibly 5 km, all remote from land, observations are few and it remains unknown whether the fault is stuck or slipping silently.
What would happen if the Cascadia Subduction Zone rupture?
When the Cascadia subduction zone ruptures, it causes part of the seafloor to move abruptly upwards. This displaces the column of water above the rupture, and the result is a tsunami: a series of waves that travel outwards in all directions from the place where the uplift occurred.