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On the consistency of moment tensor source mechanisms with first-motion data

Scott, David R. and Kanamori, Hiroo (1985) On the consistency of moment tensor source mechanisms with first-motion data. Physics of the Earth and Planetary Interiors, 37 (2-3). pp. 97-107. ISSN 0031-9201. https://resolver.caltech.edu/CaltechAUTHORS:20141105-090911403

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Abstract

Moment tensor source mechanisms for the largest twenty-nine shallow earthquakes from 1981 (M_s ≥ 6.5) have been determined using long-period Rayleigh-wave spectra and P-wave first-motions, recorded by the International Deployment of Accelerograms (IDA), Global Digital Seismic Network (GDSN), and World-Wide Standardised Seismic Network (WWSSN). These are compared with the centroid moment tensor mechanisms presented by Dziewonski and Woodhouse, which were obtained in a contrasting manner. In most cases, the source is well represented by a single double-couple mechanisms, with good agreement of scalar moment and orientation between the two studies. Apparent mismatches for other cases may be interpreted in terms of source complexity. We emphasise the objectivity of comparing moment tensor elements; apparent discrepancies in the moment and orientation of double-couple fault plane solutions are usually due to differences in the M_(xz) and M_(yz) moment tensor elements, which are poorly constrained by long-period data.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0031-9201(85)90044-5DOIArticle
http://www.sciencedirect.com/science/article/pii/0031920185900445PublisherArticle
Additional Information:© 1985 Elsevier Science Publishers B.V., Amsterdam. Received June 12, 1984; accepted August 7, 1984. We thank T. Heaton and T. Tanimoto for helpful reviews of the manuscript, and A. Dziewonski for his interest in the study. The IDA data 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. The GDSN tapes were provided by the U.S. Geological Survey. This research was supported in part by N.S.F. grant number CEE-8303647 and U.S.G.s: contract number 14-08-0001-G-814. Contribution number 4115, Division of Earth and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.
Funders:
Funding AgencyGrant Number
NSFCEE- 8303647
USGS14-08- 0001-G-814
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Earth and Planetary Sciences4115
Issue or Number:2-3
Record Number:CaltechAUTHORS:20141105-090911403
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141105-090911403
Official Citation:Scott, D. R., & Kanamori, H. (1985). On the consistency of moment tensor source mechanisms with first-motion data. Physics of the Earth and Planetary Interiors, 37(2–3), 97-107. doi: http://dx.doi.org/10.1016/0031-9201(85)90044-5
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51276
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:05 Nov 2014 18:45
Last Modified:03 Oct 2019 07:31

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