Graduate Thesis Or Dissertation
 

Source and characteristics of the tsunami observed along the coast of the Pacific Northwest on March 28, 1964

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ng451m492

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  • The physical linkage between oceanic earthquakes and most tsunamis is generally accepted. The commonly offered method of generation of a tsunami calls for displacement of submarine blocks of the earth's crust. But, the mechanism of communication of seismic energy to the water by the impulsive movements of the sea floor is still not wholly understood. As a result, the actual nature of the tsunami waves that will develop in a given instance cannot as yet be reliably predicted. The observed and recorded information concerning the Prince William Sound earthquake of March 28, 1964 and its associated tsunami provides significant material for the study of a tsunami's mode of generation and transformation. The earthquake and its aftershocks were located in a region where the gross geological setting of the epicentral area is well known. The arrival of the waves at various locations is described by eyewitness accounts and tide gage records. The predominant distribution of the aftershocks along the continental slope adjoining the Aleutian Trench, and the vertical dislocation of land masses bordering the Gulf of Alaska, suggest that the tsunami was produced by uplift and subsidence of submarine crustal blocks. Based upon assumed dislocation shapes, calculations indicate that the initial tsunami energy was approximately 1.5x10²² ergs. Enroute from its origin to the coast of the Pacific Northwest, the tsunami evidently followed a pathy typical of a shallow water wave. The degree and type of transformation of the waves, as they entered an estuary, was principally a consequence of the underwater and coastal features peculiar to that sea-inlet.
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file details Schatz_Clifford_Eugene_1965.pdf 2017-08-14 Public Télécharger