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Source mechanisms of twenty-six large, shallow earthquake (M_S ≧ 6.5) during 1980 from P-wave first motion and long-period Rayleigh wave data

Nakanishi, Ichiro and Kanamori, Hiroo (1984) Source mechanisms of twenty-six large, shallow earthquake (M_S ≧ 6.5) during 1980 from P-wave first motion and long-period Rayleigh wave data. Bulletin of the Seismological Society of America, 74 (3). pp. 805-818. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20140903-065414927

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Abstract

Source mechanisms of 26 large shallow earthquakes are determined in terms of a double-couple point source with a correction for the nondirectional part of source finiteness by using P-wave first motions and long-period Rayleigh wave spectra recorded on WWSSN, IDA, and GDSN networks. The combined use of both data sets allows us to determine the double-couple mechanism uniquely in most cases. Constrained linear moment tensor inversion (M_(xz) = M_(yz) = 0) correctly determines the strike of the fault, but fails to estimate the dip, and underestimates the scalar moment. All thrust events along the deep-sea trenches analyzed in this study show nodal planes which dip perpendicular to the trench axis at an angle shallower than 45°. The fit to data of the double-couple inversion is comparable to that of the constrained moment tensor inversion. Using the phase spectra of surface waves we can detect a slow source process with an accuracy of about 10 to 20 sec.


Item Type:Article
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http://bssa.geoscienceworld.org/content/74/3/805.abstractPublisherArticle
Additional Information:© 1984, by the Seismological Society of America. Manuscript received 12 August 1983. We would like to thank Jeffrey Given, Fumiko Tajima, and Jeanne Sauber for helping us retrieve the seismograms from the GDSN day tapes. We thank Arthur Frankel for reviewing the manuscript. The IDA data used in this study were made available to us by courtesy of the IDA project team at the Institute of Geophysics and Planetary Physics, University of California, San Diego. This research was supported by NSF Grant EAR 811-6023 and USGS Contract 14-08-0001-21223. Division of Geological and Planetary Sciences, California Institute of Technology, Contribution Number 3922.
Funders:
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NSFEAR 811-6023
USGS14-08-0001-21223
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Caltech Division of Geological and Planetary Sciences3922
Issue or Number:3
Record Number:CaltechAUTHORS:20140903-065414927
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140903-065414927
Official Citation:Ichiro Nakanishi and Hiroo Kanamori Source mechanisms of twenty-six large, shallow earthquake (MS ≧ 6.5) during 1980 from P-wave first motion and long-period Rayleigh wave data Bulletin of the Seismological Society of America, June 1984, v. 74, p. 805-818
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49160
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Sep 2014 14:21
Last Modified:03 Oct 2019 07:11

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