Research Article
May 1971
Tsunami-Responses of San Pedro Bay and Shelf, Calif.
Publication: Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 97, Issue 2
Abstract
The lowest modes of free oscillation of the continental shelf off San Pedro Bay, CA, are determined analytically from geometric models which approximate the shelf as the sector of a cone overlying a vertical-convex circular-cylindrical continental slope. The shelf is also modeled as a sloping basin coupled with the deep San Pedro Channel between the Santa Catalina Island and the mainland. The lowest modes of oscillation of the adjacent oceanic basins most likely to affect San Pedro Bay are also determined by modeling them geometrically as open-mouth, semi-ellipsoidal (Gulf of Santa Catalina) and closed, ellipsoidal (Sant Cruz Basin to Gulf of Santa Catalina). Marigrams from several tide-stations in Los Angeles-Long Beach Harbors, which recorded the tsunamis of Nov. 11, 1922 (Chile), April 1, 1946 (Aleutian Trench), May 23, 1960 (Chile) and March 28, 1964 (Alaska), have been analyzed for their power spectra and reveal numerous peaks of high energy recurrent at the widely separated times. These periods of resonance agree quite closely with many of the calculated periods of free oscillations. Knowledge of these responses is important to harbor planning because of dangerous surge currents generated in the harbors.
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Published In
Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 97 • Issue 2 • May 1971
Pages: 239 - 258
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: May 1971
Published online: Feb 12, 2021
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Authors
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Basil W. Wilson, F.ASCE
Consulting Oceanographic Engr., Pasadena, Calif.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.