On the consistency of moment tensor source mechanisms with first-motion data
- Creators
- Scott, David R.
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Kanamori, Hiroo
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.
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.Additional details
- Eprint ID
- 51276
- DOI
- 10.1016/0031-9201(85)90044-5
- Resolver ID
- CaltechAUTHORS:20141105-090911403
- CEE- 8303647
- NSF
- 14-08- 0001-G-814
- USGS
- Created
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2014-11-05Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences
- Other Numbering System Name
- Caltech Division of Earth and Planetary Sciences
- Other Numbering System Identifier
- 4115