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.

What cities will be affected by the Cascadia earthquake?

Coastal Pacific Northwest

Called the Cascadia subduction zone, a big quake along this fault could affect the cities of Seattle, Tacoma, Portland, Eugene, Salem, and Olympia.

How likely is it that the next Cascadia earthquake will occur this century?

THE GASTRO OBSCURA BOOK

Seven times in the past 3,500 years, the CSZ has buckled and fractured to produce an earthquake so massive that it left a mark in the geologic record. There's a one-in-10 chance that the next major Cascadia quake will occur sometime in the next 50 years.

What are the odds of a Cascadia event over the next 50 years?

Thanks to work done by him and his colleagues, we now know that the odds of the big Cascadia earthquake happening in the next fifty years are roughly one in three.

Where will the Cascadia tsunami reach?

An earthquake on the Cascadia subduction zone, a 1000-km- (~600-mile-) long fault zone that sits off the Pacific Northwest coast, can create a Cascadia tsunami that will reach the Oregon coast within 15 to 20 minutes.

Will the Cascadia Earthquake be the Worst Disaster North America’s Ever Seen? | Weathered

Is Oregon overdue for an earthquake?

According to the Oregon Office of Emergency Management, “scientists predict the chances that a mega-CSZ earthquake will occur within the next 50 years are about one in ten.” This chart shows the frequency of major quakes along the Cascadia Subduction Zone over the last 10,000 years.

Is Oregon due for a tsunami?

Earthquake experts in the Northwest have said the Cascadia Subduction Zone is due for a large, undersea seismic event — possibly soon — which could trigger a catastrophic earthquake and tsunami along the Oregon Coast.

Would Cascadia tsunami hit Seattle?

New tsunami hazard maps published by the Washington Geological Survey and the Washington State Department of Natural Resources (DNR) show that a large earthquake on the Cascadia subduction zone (CSZ) off the Washington coast could cause a tsunami that will not only reach the Puget Sound and Hood Canal, but will leave ...

How do you prepare for the Cascadia earthquake?

Emergency Managers say to have an emergency plan and at least two weeks of supplies in order to shelter in place and take care of your family after a Cascadia earthquake. Having water, food and safety supplies will allow you to meet your basic needs instead of scrambling at a time of limited resources.

How overdue is a great earthquake on the Cascadia Subduction Zone?

Currently, scientists are predicting that there is about a 37 percent chance that a megathrust earthquake of 7.1+ magnitude in this fault zone will occur in the next 50 years. This event will be felt throughout the Pacific Northwest.

What year will the big one hit?

According to USGS there is a 70% chance that one or more quakes of a magnitude 6.7 or larger will occur before the year 2030. Two earthquakes have previously been data-classified as big ones; The San Francisco quake in 1906 with a magnitude of 7.8 and the Fort Tejon quake in 1857 that hit 7.9.

Will the Cascadia earthquake affect California?

While the most significant impacts of a Cascadia rupture would be felt in far Northern California, Oregon and Washington, the Alaska earthquake scenario would direct ocean wave energy farther south, flooding much of California's low-lying coastline and requiring the evacuation of 300,000 to 400,000 people.

What are the odds that a major quake will strike Cascadia in our lifetimes?

It is simply not scientifically feasible to predict, or even estimate, when the next Cascadia earthquake will occur, but the calculated odds that a Cascadia earthquake will occur in the next 50 years range from 7-15 percent for a great earthquake affecting the entire Pacific Northwest to about 37 percent for a very ...

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.

How far inland can a 100 ft tsunami go?

Most tsunamis are less than 10 feet high when they hit land, but they can reach more than 100 feet high. When a tsunami comes ashore, areas less than 25 feet above sea level and within a mile of the sea will be in the greatest danger. However, tsunamis can surge up to 10 miles inland.

How long is the Cascadia fault?

The Cascadia Subduction Zone (CSZ) is a 1,000 km (620 mi) long dipping fault that stretches from Northern Vancouver Island to Cape Mendocino in northern California. It separates the Juan de Fuca and North America plates.

How often does the Cascadia fault rupture?

How often do megathrust earthquakes occur? The recurrence time varies from subduction zone to subduction zone. In the Cascadia subduction zone 13 megathrust events have been identified in the last 6000 years, an average one every 500 to 600 years.

How likely is a tsunami in Oregon?

And that time might not be very far off: in the next fifty years, Oregon faces a one-in-three chance of experiencing a tsunami comparable to those that recently devastated Japan and Indonesia.

Will Portland be destroyed by an earthquake?

In the event of a Cascadia Subduction Zone earthquake, over 200,000 homes are likely to be damaged in the city of Portland, according to a study by the Oregon Department of Geology and Mineral Industries (DOGAMI). The two largest cities in the Pacific Northwest, Seattle and Portland, are home to several million people.

How tall will the Cascadia tsunami be?

Along the Pacific Northwest coast, tsunami waves from a Cascadia Subduction Zone earthquake would average 40-60 feet high, with potential 100-foot waves in some areas.

How far will the big one tsunami reach?

A full rupture of the fault could be felt for 775 miles from Northern California to Vancouver Island, Canada, according to the latest tsunami hazard maps from the Washington State Department of Natural Resources released on Jan.

What would happen in Seattle Cascadia earthquake?

A Cascadia megathrust earthquake could rank as one of the largest earthquakes ever recorded, but because Seattle is several hundred miles from the source seismic waves would weaken slightly before they reach Seattle. Shaking would be violent and prolonged, but not as intense as in a Seattle Fault quake.

Is a 10.0 earthquake possible?

No, earthquakes of magnitude 10 or larger cannot happen. The magnitude of an earthquake is related to the length of the fault on which it occurs. That is, the longer the fault, the larger the earthquake.

How long does a 9.0 earthquake last for?

A magnitude 9.0 earthquake can last for five minutes or longer, and the amount of energy released is about 1,000 times greater than that of a 7.0. According to the U.S. Geological Survey, the most powerful quakes could leave few if any masonry buildings standing, destroy bridges and toss objects into the air.

Is Oregon on the fault line?

The Cascadia Fault marks the edge of Oregon's active subduction zone. It is very active, producing magnitude 8-9 earthquakes on average every 450 to 500 years, with the last event in 1700 AD.

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