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  1. #1
    Join Date
    Sep 2007
    Location
    Honolulu, HI
    Posts
    510
    Because of the unconsolidated soils in the east (e.g., Mississippi River system floodplains), the effects of an earthquake are felt much further away than most earthquakes in the west.

    In the PNW I'd probably be more worried about lahars coming off Rainier when it blows or even a tsunami from the Cascadia subduction zone if you live on the coast.

  2. #2
    Join Date
    Aug 2007
    Location
    Tigard, OR
    Posts
    439
    Not worried about the Lahars coming off Rainier. I don't live anywhere near it. For that matter, I'm not worried about any Lahars coming off anything. Next closest lahar producing place is Mt. Hood and I have the hills west of Portland between me and it.

    The Cascadia subduction tsunami is a slightly higher possibility. I've thought it through but I don't have a clear answer about whether a tsunami of that magnitude would flow 100 miles upriver against the Columbia river. Again though, I live at about 250 feet above sea level so if the tsunami gets that high, it's because god hates me.

    What seems more likely is an earthquake. Either from the subduction zone or one of the other faults in the Portland area.
    re-cur-sion ri'-ker-shen n: see recursion

  3. #3
    Join Date
    Apr 2005
    Location
    Vancouver, BC
    Posts
    3,932
    Quote Originally Posted by boy in a kilt View Post
    The Cascadia subduction tsunami is a slightly higher possibility. I've thought it through but I don't have a clear answer about whether a tsunami of that magnitude would flow 100 miles upriver against the Columbia river. Again though, I live at about 250 feet above sea level so if the tsunami gets that high, it's because god hates me.
    I did get the "earthquake" rider when renewed our insurance recently. I think we'll see it during our lifetime...

 

 

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