Source-mechanism from spectra of long-period seismic surface waves. 3. The Alaska earthquake of July 10, 1958
- Creators
- Ben-Menahem, Ari
- Toksöz, M. Nafi
Abstract
Source-mechanism is derived from amplitude and phase spectra of mantle Love and Rayleigh waves of the Alaska earthquake of July 10, 1958. The signals R_2, R_3, G_2, G_4, G_5 recorded on the Gilman 80–90 and the Press-Ewing 30–90 seismograph systems at Pasadena, California, are separated, digitized, filtered and Fourier-analyzed. An agreement between theory and observations is obtained for a unilateral fault of 300–350 km, which ruptured with a speed of 3-3.5 km/sec in the direction N40°W. Fault length is in good agreement with the extent of aftershock distribution in the month of July, 1958, and the time of rupture checks with the duration of an impressive T-phase recorded at Hawaii. The phases of the signals are corrected for propagation, instrumental shift and the source finiteness. Initial phases thus obtained agree on a mechanism of a right double-couple with a unit step-function in time.
Additional Information
Copyright © 1963, by the Seismological Society of America. Manuscript received May 31, 1963. This research was supported by Grant No. AF-AFOSR-25-63 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency project VELA UNIFORM. We wish to express our sincere thanks to Dr. J. P. Eaton and Dr. Harold J. Krivoy of the U.S. Geological Survey and to Dr. Robert A. Earle of the U.S.C.G.S. for sending us the Hawaii T-phase seismograms of the Alaska earthquake. Acknowledgment is also due to Drs. Keiiti Aki and Augustine Furumoto for helpful discussions. The time series analysis and azimuth-distance computer programs used in the data analysis were written by Dr. Shelton S. Alexander.Attached Files
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Additional details
- Eprint ID
- 47852
- Resolver ID
- CaltechAUTHORS:20140801-160221934
- AF-AFOSR-25-63
- Air Force Office of Scientific Research (AFOSR)
- Advanced Research Projects Agency (ARPA), project Vela
- Created
-
2014-08-04Created from EPrint's datestamp field
- Updated
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2023-06-15Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological Sciences
- Other Numbering System Identifier
- 1164