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Alaska Bathymetry: Central Gulf of Alaska Seafloor Changes(pg 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

Seafloor Changes of Central Gulf of Alaska

Great Alaska Earthquake of 1964

An added difficulty in describing bathymetry across this vast area is that it is changing faster than it is being surveyed. The best known example of seafloor change is the great Alaska earthquake of 1964 (magnitude 9.2), centered near Valdez, which abruptly altered the seascape across a large expanse of the CGOA (National Research Council 1972). A comparison of smooth sheet surveys conducted before and after the 1964 earthquake showed sinking of 0.2 to 9.8 m in Resurrection Bay, rising of 6.1 m at Cape Clear, and rising of 1.6 to 4.2 m at Middleton Island.


National Research Council. 1972. The great Alaska earthquake of 1964: Seismology and geodesy. National Academy of Sciences, Washington, D.C., 596 p.



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