A crustal earthquake, in comparison with a slab (Juan de Fuca Plate) earthquake of the same magnitude. exhibits a higher maximum intensity over a smaller area. Which of the following did NOT accompany a large earthquake on the Seattle Fault about a thousand years ago? subsidence of marshes in southwest Washington .
What fault is Seattle on?
| Seattle Fault | Plate North American | Status Active | Earthquakes c. 900 CE | Type Thrust fault |
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What fault runs through Washington?
The largest active fault that will affect Washington (and the whole Pacific Northwest) is the Cascadia subduction zone . This fault produces some of the largest and most damaging earthquakes in the world (M9).
Is Seattle on the San Andreas Fault?
The fault zone is the result of massive tectonic plates colliding in the Northwest. Puget Sound sits near the western edge of the North American plate, which lies under the United States and Canada. ... Unlike the San Andreas Fault, which slips side-to-side in an earthquake, the Seattle Fault is a thrusting fault .
Is Seattle in a seismic zone?
An earthquake on the Seattle Fault poses the greatest risk to Seattle because: The Seattle Fault Zone extends east-west through the middle of the city . ... The most recent Seattle Fault earthquake was about 1,100 years ago; The Seattle Fault has been active about three or four times in the past 3,000 years.
How deep is the Seattle fault?
Based on microseismicity, Brocher and others (2001 #4718) favor a model in which the Seattle fault zone dips steeply from the surface to a depth of about 25 km .
Will California fall into the ocean?
No, California is not going to fall into the ocean . California is firmly planted on the top of the earth’s crust in a location where it spans two tectonic plates. ... The Pacific Plate is moving northwest with respect to the North American Plate at approximately 46 millimeters per year (the rate your fingernails grow).
When was the last time Washington State had an earthquake?
The most recent major earthquake, the Nisqually quake, was a magnitude 6.8 quake and struck near Olympia, WA on February 28, 2001 .
Can Seattle have a tsunami?
Seattle’s Harbor Island could be inundated up to 4 feet . One major hotspot is Belfair, located at the tip of the Hood Canal, which could see up to 14 feet of water. However, it’s not just the inundation that we need to worry about.
How often does the Cascadia fault rupture?
16 May 2018–Devastating magnitude 8.0 to 9.0 megathrust earthquakes and accompanying tsunamis appear to have hit the U.S. Pacific Northwest and Southwest Canada about every 500 years on average .
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. ... The largest earthquake ever recorded was a magnitude 9.5 on May 22, 1960 in Chile on a fault that is almost 1,000 miles long...a “megaquake” in its own right.
What would a 9.0 earthquake do to Seattle?
– A 9.0 magnitude subduction earthquake off the Washington coast would generate a tsunami capable of submerging not only coastal areas but also most of the Puget Sound shoreline with churning waves of seawater several feet high for up to 14 hours, says a newly released study.
What state has never had an earthquake?
Florida and North Dakota are the states with the fewest earthquakes. Antarctica has the least earthquakes of any continent, but small earthquakes can occur anywhere in the World.
What tectonic plate is Seattle on?
Seattle lies near to the boundary between the North American tectonic plate and Juan de Fuca, a large oceanic plate. The 700-mile plate boundary, known as the Cascadia Subduction zone, runs from northern California to Canada, and all along it, the Juan de Fuca plate is trying to force its way under North America.
Are Seattle buildings earthquake proof?
A new study suggests than many buildings in Seattle cannot withstand large earthquake incidents .
Does Seattle get earthquakes often?
This area has a megathrust earthquake about every 500 years . About 15% of Seattle’s total area is soil that is prone to ground failure in earthquakes.
