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Use of long-period surface waves for rapid determination of earthquake source parameters 2. Preliminary determination of source mechanisms of large earthquakes (M_S ⩾ 6.5) in 1980

Kanamori, Hiroo and Given, Jeffrey W. (1982) Use of long-period surface waves for rapid determination of earthquake source parameters 2. Preliminary determination of source mechanisms of large earthquakes (M_S ⩾ 6.5) in 1980. Physics of the Earth and Planetary Interiors, 30 (2-3). pp. 260-268. ISSN 0031-9201. http://resolver.caltech.edu/CaltechAUTHORS:20141217-080938296

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Abstract

An inversion method for fast retrieval of earthquake source parameters developed earlier has been applied to 28 large (M_S ⩾ 6.5), shallow earthquakes which occurred in 1980. Rayleigh waves recorded by the IDA (International Deployment of Accelerographs) network were used for the analysis. For very shallow events, the inversion is ill-conditioned and two of the moment-tensor elements, M_(zx) and M_(zy), are unresolvable. Of the 28 events, a solution is obtained for 25 with the constraints M_(zx) = M_(zy) = 0. Although these constraints limit the solution to be either vertical strike-slip or 45° dip-slip, the method provides a useful first approximation to the mechanism solution. For deeper events, all of the elements of the moment tensor can be determined. After the seismograms have been retrieved, the solution can be obtained in ∼10 min for most events. The method would be adequate for preliminary cataloging purposes.


Item Type:Article
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http://dx.doi.org/10.1016/0031-9201(82)90112-1 DOIArticle
http://www.sciencedirect.com/science/article/pii/0031920182901121PublisherArticle
Additional Information:© 1982 Elsevier Scientific Publishing Company. Received October 29, 1981; revision accepted February 20, 1982. 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. This work was supported by the U.S. Geological Survey under Contract No. 14-08-0001-19755.
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Funding AgencyGrant Number
USGS14-08-0001-19755
Record Number:CaltechAUTHORS:20141217-080938296
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141217-080938296
Official Citation:Hiroo Kanamori, Jeffrey W. Given, Use of long-period surface waves for rapid determination of earthquake source parameters 2. Preliminary determination of source mechanisms of large earthquakes (MS ⩾ 6.5) in 1980, Physics of the Earth and Planetary Interiors, Volume 30, Issues 2–3, November 1982, Pages 260-268, ISSN 0031-9201, http://dx.doi.org/10.1016/0031-9201(82)90112-1. (http://www.sciencedirect.com/science/article/pii/0031920182901121)
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ID Code:52934
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Dec 2014 17:05
Last Modified:17 Dec 2014 17:05

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