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Synthesis of Long-Period Surface Waves and Its Application to Earthquake Source Studies -- Kurile Islands Earthquake of October 13, 1963

Kanamori, Hiroo (1970) Synthesis of Long-Period Surface Waves and Its Application to Earthquake Source Studies -- Kurile Islands Earthquake of October 13, 1963. Journal of Geophysical Research, 75 (26). pp. 5011-5027. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20150128-090312640

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Abstract

Normal mode solutions for a spherical earth model are superposed to obtain realistic synthetic surface waves for various force systems. The calculation of excitation functions is greatly facilitated by the variational technique. The effects of attenuation and instrument response are included in the synthesis. The synthesized seismograms are compared with the actual seismograms for wave form, amplitude, radiation pattern, and phase to obtain various source parameters such as force geometry, source-time function, seismic moment, source dimension, and rupture velocity. The application is made to the Kurile Island earthquake of October 13, 1963 (M = 8.3). The comparison is made for Love waves G_4 and Rayleigh waves R_4 for a period range 100 to 400 sec. It is found that a reverse dip-slip fault with a dip angle of 22° and a dip direction of N47°W can explain the observation reasonably well. Other parameters determined are as follows: seismic moment, 7.5×10^(28) dyne-cm; source-time function, step function; fault length, 200 to 300 km; rupture velocity, 2.7 to 4.5 km/sec in the direction N43°E.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/JB075i026p05011DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/JB075i026p05011/abstractPublisherArticle
ORCID:
AuthorORCID
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1970 by the American Geophysical Union. Received January 12, 1970. I benefited from discussions with Masanori Saito and Katsuyuki Abe in the early stages of this work. Dr. W. Stauder kindly provided me with some unpublished information for this earthquake. I am grateful to Frank Press for generously making available to me, in advance of publication, his new earth models, by which the synthetic seismograms were greatly improved. I thank Keiiti Aki and Frank Press who kindly read the manuscript and made many valuable suggestions. I am indebted to Tomowo Hirasawa for the interpretation of the body-wave solution, and to Ralph Wiggins for the construction of the earth model used here. This work was partially supported by the Air Force Office of Scientific Research under contract AF49 (638) 1632.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)AF49 (638) 1632
Subject Keywords:Earthquakes: Pacific Ocean; Seismology: Elastic Waves; Seismology: Seismic Sources
Issue or Number:26
Record Number:CaltechAUTHORS:20150128-090312640
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150128-090312640
Official Citation:Kanamori, H. (1970), Synthesis of Long-Period Surface Waves and Its Application to Earthquake Source Studies -- Kurile Islands Earthquake of October 13, 1963, J. Geophys. Res., 75(26), 5011–5027, doi:10.1029/JB075i026p05011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54169
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Jan 2015 17:24
Last Modified:09 Mar 2020 13:18

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