But a magnitude 9 rupture on the Cascadia earthquake fault will likely cut electricity, running water and sewer for weeks — or even months — afterward. Research Shows Cascadia Quakes Sometimes Trigger San Andreas
This earthquake struck the Oregon coast before there were written records in the … Mercalli Index: Ground shaking will depend on the actual fault rupture method and can not be accurately forecast.
The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26 with an estimated moment magnitude of 8.7–9.2. The vast majority of great Cascadia quakes during that period have a correlation on the San Andreas Fault. The earthquake that released about 1500 times the seismic energy than the 2001 M 6.8 Nisqually …
The length of the fault rupture was about 1,000 kilometers (620 miles), with an average slip of 20 meters … Seismic activity on the southern Cascadia Subduction fault may have triggered major earthquakes along the northern San Andreas Fault in California, according to new research. There are fears that the big one could happen in the Cascadia Subduction Zone (CSZ) which stretches 1,000km (620 miles) from northern California all the way up to Vancouver. And the research doesn't rule out ruptures of the fault along the Oregon Coast, although they are less likely, he said. The megathrust earthquake involved the Juan de Fuca Plate from mid-Vancouver Island, south along the Pacific Northwest coast as far as northern California. Continue Reading The Big One — And Another One. Such ruptures affect the entire northwest region of the country and have direct impacts on other countries and other US states and …
Scientists found nine to eleven instances over roughly the last 3,000 years where a Cascadia earthquake seems to have triggered a San Andreas quake.
Earthquakes on the Cascadia Subduction Zone have struck the Northwest offshore for at least 10,000 years.
It is anticipated that the fault will rupture along its entire 700 mile length resulting in a magnitude 9.0 earthquake that will last 3-5 minutes. The most recent big Cascadia earthquake occurred on January 26, 1700, dated by accounts from Japan of an orphan tsunami generated by a Cascadia earthquake and recorded after the wave crossed the Pacific Ocean.
The 1000 km long fault rupture propagated from its origin at about 3 km a second, generating fresh seismic waves as the fault continued to unzip and slip.
Assuming the rupture began in Northern California, it likely took over 5 minutes break the entire fault to northern Vancouver Island. The Cascadia Subduction Zone (CSZ) experiences a full fault rupture, with earthquakes of magnitudes greater than 7.0, once every 500 years, on average. The intensity of the shaking will decrease with distance from the fault.
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