This paper reports the interviews of 48 elderly witnesses to the Aleutian tsunami of 1 April 1946, which resulted in the measurement of a database of 54 values of runup and inundation in 31 valleys of the Marquesas, Easter, and Juan Fernández Islands. The 1946 Aleutian tsunami remains one of the most enigmatic such events of the past century. It resulted in catastrophic destruction both locally (with the annihilation of the Scotch Cap lighthouse on Unimak Island, where runup reached 42 m) and in the far field, where it claimed a total of 162 lives in California, the Marquesas, and...

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