What cities will be affected by the Cascadia earthquake?

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

Does Corvallis get earthquakes?

So far, no such events have occurred, nor have earthquakes associated with drilling at the volcano been registered. Perhaps the largest concerns associated with an earthquake in Corvallis, regardless of scale, are landslides, dam failures, and liquefaction. The quake that caused those had a magnitude of 6.9.

Which cities are threatened by the Cascadia fault?

Helens in 1980. Major cities affected by a disturbance in this subduction zone include Vancouver and Victoria, British Columbia; Seattle, Washington; and Portland, Oregon.

How far inland will the Cascadia earthquake reach?

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 is the earthquake risk along the Cascadia subduction zone?

Cascadia has now been building up strain for over 300 years, so the next great earthquake could happen at any time. Reduced to simple odds, the chances that an earthquake as large as magnitude 9.0 will occur along the zone within the next 50 years are about one in ten.

How far inland is safe from a tsunami?

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.

Is the Corvallis Fault active?

The Corvallis thrust was active during the late Eocene, and was the eastern boundary of a tectonic highland in the Eocene forearc. Later reactivation of the Corvallis fault as a left-lateral strike-slip fault, indicated by horizontal slickenlines, is consistent with the present north-south compression in Oregon.

Is Corvallis Oregon on a fault line?

The Corvallis Fault is located north and west of the City of Corvallis. The general location of this fault is illustrated on the following maps produced by Benton County and the City of Corvallis.

How likely is Cascadia earthquake?

How overdue is the Cascadia earthquake?

The estimated time between Cascadia subduction zone earthquakes is anywhere from 200 to 800 years. The last on record was Jan. 26, 1700. That means another earthquake is neither impossible nor overdue, Nissen says.

How far offshore is the Cascadia subduction zone?

about 700 miles
The Cascadia subduction zone stretches from Cape Mendocino in northern California to Brooks Peninsula on Vancouver Island in British Columbia, a distance of about 700 miles (1,130 km).

Is the Cascadia subduction zone in danger of an earthquake?

The Cascadia Subduction Zone has not produced an earthquake since 1700 and is building up pressure where the Juan de Fuca Plate is subsiding underneath the North American plate.

When was the last Cascadia earthquake in Washington State?

The last Cascadia rupture was 321 years ago, and experts estimate a 10 to 17 percent chance that Washington experiences another in the next 50 years. This Cascadia study builds on previous studies of impacts to Puget Sound communities from earthquakes produced on the Seattle Fault.

When was the last earthquake on the tsunami fault?

The last earthquake that occurred in this fault was on January 26, 1700, with an estimated 9.0 magnitude. This earthquake caused the coastline to drop several feet and a tsunami to form and crash into the land. What is most surprising is that evidence for this great earthquake also came from Japan.

How long does it take for a tsunami to hit Puget Sound?

The study finds the first tsunami waves would reach Whidbey Island within one hour and 30 minutes after the earthquake, and more inland locations of Puget Sound some 2 to 4 hours after. Wave activity may inundate shorelines for some 14 hours, with strong currents remaining in inland waters for more than 24 hours.