The Montenegro, Yugoslavia, earthquake of April 15, 1979: source orientation and strength
Abstract
Long-period teleseismic P, S and Rayleigh waves and geologic considerations indicate that the Montenegro earthquake involved thrust faulting on a plane striking nearly parallel to the Adriatic coast and dipping ca. 15° toward the Yugoslav mainland. There is some support from modeling of body waves recorded on long-period WWSSN instruments for a focal depth of 22 km, but the possibility of a multiple source and the difficulty of matching some of the detailed characteristics of the P- and S-wave forms reduce our confidence in the determination of the depth. Fortunately, the source orientation and moment of the event are not sensitive functions of the depth. The long-period (256 s) moment was 4.6 × 10^(19) Nm (4.6 × 10^(26) dyne-cm). The moment obtained by fitting the first cycle of P and S waves recorded on WWSSN long-period instruments is about four times smaller. This increase of moment with period is consistent with spectral estimates of the moment from SH waves recorded at SRO and ASRO stations.
Additional Information
© 1981 Elsevier Scientific Publishing Company. Received March 10, 1981; revised and accepted June 5, 1981. We thank C. Mueller for help with the body-wave modeling, B. Julian for help with SRO spectra and for a critical reading of the manuscript, W. Ellsworth and W. Joyner for reviews of the report, and J. Petrovski for information about accelerograph recordings. The IDA data used in this study were made available by courtesy of the IDA project team at the Institute of Geophysics and Planetary Physics, University of California, San Diego. P. Godefroy provided hypocentral determinations from the CSEM. This research was partially supported by U.S. Geological Survey Contract No. 14-08-0001-19755. Contribution No. 3707, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.Additional details
- Eprint ID
- 52892
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- CaltechAUTHORS:20141216-142931700
- 14-08-0001-19755
- USGS
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2014-12-16Created 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
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- Caltech Division of Geological and Planetary Sciences
- Other Numbering System Identifier
- 3707