So. Oregon Earthquake Hazard Upgraded

E

El and Bill

New member
Info from C-Brat geologist:

Forewarned is forearmed. Know how to prepare and what to do. Probabilities much higher than previously thought after 13-year OSU study:

"CORVALLIS, Ore. – A comprehensive analysis of the Cascadia Subduction Zone off the Pacific Northwest coast confirms that the region has had numerous earthquakes over the past 10,000 years, and suggests that the southern Oregon coast may be most vulnerable based on recurrence frequency.

Written by researchers at Oregon State University, and published online by the U.S. Geological Survey, the study concludes that there is a 40 percent chance of a major earthquake in the Coos Bay, Ore., region during the next 50 years. And that earthquake could approach the intensity of the Tohoku quake that devastated Japan in March of 2011."

http://oregonstate.edu/ua/ncs/archives/ ... -complete-–-and-earthquake-risk-looms-large
 
My brother lives in coos bay. His house in up side down in his mortgage and the left side of the house is settling. He would consider a quake a 'good thing ' about now.
 
We are in Lakewood, CO - against the Front Range west of Denver. Doing land travel (camping) and rafting (canoeing, also).

On the subject of earthquakes -- a reminder that a tsunami is always a possibility in the San Juan Islands and along the NW coast. If the tide suddenly goes out (unexpectedly) get off the boat and up to the high ground.
 
Bill, i have look on the net for a computer model of the effects of a Tsunami on the puget sound but have never been able to find one. Do you know of any that you could link too. I have read that unless the quake was in the sound or western washington its self that there would be little effect from a off shore quake. What do you think?
 
starcrafttom":e0jp2ipf said:
My brother lives in coos bay. His house in up side down in his mortgage and the left side of the house is settling. He would consider a quake a 'good thing ' about now.
Click to expand...

Tom, you might advise your brother to make sure that earthquakes are covered by his policy. Many don't cover them.

Charlie
 
4.9 Richter off Oregon coast today - Cascadia fault zone (Pacific Plate sliding under No. American Plate IS active.

Contacting seismological friends re Puget Sound and will let you know what I hear.
 
Thanks that was helpful as far as the Seattle fault goes. I was more interested in what would happen if a tsunami entered the sound from the pacific? I have been told that it would not make it much pass the straits because of the small entrance near port Townsend.
 
Roger, thats what I was looking for. great info that backs up what I beleived already. Marysville will have little or no flooding if a tsunami hit the area and My rental, that is 56 ft above sea level , will not suffer at all.

looks like the max wave height in both papers will be about 6 ft-8ft. If we get hit at low tide there will still be damage at many marines due to the current speeds as we saw on the California coast after the last Japanese quake. Using Bellingham bay as a guide I would expect the snohomish river delta to channel most of the water far up into the system. I would hate to live at Priest point at the north side of the deltas entrance.

In the second link I found this tidbit.
April – August 1953 – Landslides originating in Reed Terrace caused waves in
the lake at least 11 different times. The largest wave to hit the opposite shore
was 65 feet and observed up to six miles away. Velocity of one of the series of
waves was about 45 miles per hour.
Click to expand...

This was one of several examples of large lake waves from land slides.
 
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