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The Alaska Earthquake of 1964: Radiation of long-period surface waves and source mechanism

Kanamori, Hiroo (1970) The Alaska Earthquake of 1964: Radiation of long-period surface waves and source mechanism. Journal of Geophysical Research, 75 (26). pp. 5029-5040. ISSN 0148-0227. doi:10.1029/JB075i026p05029.

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The records of multiple Love and Rayleigh waves of the Alaska earthquake of 1964 were recovered from the 30–100 seismograph records at the WWSSN stations. The seismograms were equalized to a propagation distance of 9π/2 (equivalent to G5 and R5 at Δ = π/2). These seismograms were compared with synthetic seismograms for radiation pattern and amplitude to estimate various source parameters. The synthetic seismograms were computed from the normal mode solutions. One simple, yet plausible, source model was found. The nature of the fault is essentially that of a low-angle thrust faulting. The direction of rupture propagation does not coincide with the strike of the fault. This enables one to distinguish between the fault plane and the auxiliary plane. The source parameters determined are as follows: force system, double couple, reverse dip slip; fault plane, dip angle 20°, dip direction N 24°W; rupture length. 600 km; rupture velocity, 3.5 km/sec towards S25°W; moment, 7.5×10^(29) dyne-cm; average slip dislocation, 7 meters in N24°W direction; stress drop, 28 bars; strain drop, 0.4×10^(−4); released strain energy. 1.5×10^(25) ergs. The moment and the width of the fault plane of this earthquake are much larger than those of any other earthquakes reported.

Item Type:Article
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Kanamori, Hiroo0000-0001-8219-9428
Additional Information:Copyright 1970 by the American Geophysical Union. (Received March 30, 1970.) I am grateful to Drs. Keiiti Aki and Frank Press for kindly reading the manuscript and making many suggestions. In constructing the final model, I benefited from discussions with Drs. Keiiti Aki, Nafi Toksöz, and Tomowo Hirasawa. This work was supported by the Air Force Office of Scientific Research under contract AF49 (638) 1632.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)AF49 (638) 1632
Subject Keywords:Earthquakes: North America; Seismology: Elastic Waves; Seismology: Seismic Sources
Issue or Number:26
Record Number:CaltechAUTHORS:20141107-101156474
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Official Citation:Kanamori, H. (1970), The Alaska Earthquake of 1964: Radiation of long-period surface waves and source mechanism, J. Geophys. Res., 75(26), 5029–5040, doi:10.1029/JB075i026p05029.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51426
Deposited By: George Porter
Deposited On:07 Nov 2014 18:26
Last Modified:10 Nov 2021 19:10

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