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Old 08-31-2018, 04:01 PM
 
Location: Not far from Fairbanks, AK
16,171 posts, read 27,421,913 times
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Quote:
Originally Posted by Blind Cleric View Post
At that height I think you're good. http://dggs.alaska.gov/webpubs/dggs/..._001_sh002.pdf
A tsunami would still effect that area, and that's the reason for the inundation map shown above. The Island in front would take some of the brunt if the wave would move straight toward it, but not if moving in a different direction.

This was a very serious one:
https://earthquake.alaska.edu/earthq...kan-earthquake

Last edited by RayinAK; 08-31-2018 at 04:11 PM..
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Old 08-31-2018, 06:04 PM
 
1,390 posts, read 1,703,875 times
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Quote:
Originally Posted by stiffnecked View Post
#1 Sitka
dang. that place looks amazing.
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Old 08-31-2018, 11:15 PM
 
Location: on the wind
4,123 posts, read 1,535,580 times
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[quote=RayinAK;52964389]A tsunami would still effect that area, and that's the reason for the inundation map shown above. The Island in front would take some of the brunt if the wave would move straight toward it, but not if moving in a different direction.

I know the location of the house alaskaflyer mentioned. It is much farther up the Salmon River than the DNR Tsunami Inundation scenario map shows. If a wave was triggered by a large landslide in Glacier Bay it would not hit Gustavus directly and there's quite a prominent shoreline between. A wave coming from the Gulf would have to ricochet along Cross Sound and Icy Strait and around a couple of islands before it reached Pleasant Island or Gustavus. The only other direction a tsunami could flow would be from the east (Lynn Canal) along Icy Strait, again, not a straight shot with a few islets and shoals in the way.

Last edited by Parnassia; 08-31-2018 at 11:26 PM..
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Old 09-01-2018, 12:34 AM
 
Location: Not far from Fairbanks, AK
16,171 posts, read 27,421,913 times
Reputation: 11838
[quote=Parnassia;52966824]
Quote:
Originally Posted by RayinAK View Post
A tsunami would still effect that area, and that's the reason for the inundation map shown above. The Island in front would take some of the brunt if the wave would move straight toward it, but not if moving in a different direction.

I know the location of the house alaskaflyer mentioned. It is much farther up the Salmon River than the DNR Tsunami Inundation scenario map shows. If a wave was triggered by a large landslide in Glacier Bay it would not hit Gustavus directly and there's quite a prominent shoreline between. A wave coming from the Gulf would have to ricochet along Cross Sound and Icy Strait and around a couple of islands before it reached Pleasant Island or Gustavus. The only other direction a tsunami could flow would be from the east (Lynn Canal) along Icy Strait, again, not a straight shot with a few islets and shoals in the way.
I would not be so sure. Look at the maximum inundations areas by Gustavus:
https://earthquake.alaska.edu/tsunamis/atom

There is a reason for having inundation maps. However, nobody knows for certain when a tsunami will be created by a quake or land slide.

Last edited by RayinAK; 09-01-2018 at 01:05 AM..
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Old 09-01-2018, 08:04 AM
 
Location: Alexander Archipelago
2,803 posts, read 1,496,333 times
Reputation: 2750
[quote=Parnassia;52966824]
Quote:
Originally Posted by RayinAK View Post

I know the location of the house alaskaflyer mentioned. It is much farther up the Salmon River than the DNR Tsunami Inundation scenario map shows. If a wave was triggered by a large landslide in Glacier Bay it would not hit Gustavus directly and there's quite a prominent shoreline between. A wave coming from the Gulf would have to ricochet along Cross Sound and Icy Strait and around a couple of islands before it reached Pleasant Island or Gustavus. The only other direction a tsunami could flow would be from the east (Lynn Canal) along Icy Strait, again, not a straight shot with a few islets and shoals in the way.

Right. It's practically impossible for Gustavus to take a big hit from a Tsunami.
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Old 09-01-2018, 08:08 AM
 
Location: Alexander Archipelago
2,803 posts, read 1,496,333 times
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Quote:
Originally Posted by zach_33 View Post
dang. that place looks amazing.
Indeed. Just remember that the sunny day images are very rare occurrences.
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Old 09-01-2018, 10:44 AM
 
Location: on the wind
4,123 posts, read 1,535,580 times
Reputation: 14719
[quote=RayinAK;52966982]
Quote:
Originally Posted by Parnassia View Post

I would not be so sure. Look at the maximum inundations areas by Gustavus:
https://earthquake.alaska.edu/tsunamis/atom
This link shows basically the same maximum runup the DNR map previously linked does. There are some homes that would be affected, but the one alaskaflyer mentioned would not be. The whole area is rising due to isostatic rebound (the earth's crust is lifting because of the reduction in glacial icefields). It's about 3 cm per year. It's noticeable...much of the current marine shoreline is "new", only recently supratidal and dry, and has never been built on. Even if someone was arrogant or stupid enough to try, a lot of it is state-owned so won't be possible anyway.

Last edited by Parnassia; 09-01-2018 at 11:55 AM..
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Old 09-05-2018, 06:09 PM
 
Location: interior Alaska
3,978 posts, read 2,963,042 times
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Sitka or Juneau, I think.
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Old 09-08-2018, 11:39 AM
 
317 posts, read 147,859 times
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On my Skookum in Wrangell
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