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Complexity of rupture in large strike-slip earthquakes in Turkey

Stewart, Gordon S. and Kanamori, Hiroo (1982) Complexity of rupture in large strike-slip earthquakes in Turkey. Physics of the Earth and Planetary Interiors, 28 (1). pp. 70-84. ISSN 0031-9201. doi:10.1016/0031-9201(82)90118-2.

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Complexity of rupture propagation has an important bearing on the state of stress along the earthquake fault plane and on the prediction of strong ground motion in the near-field. By studying far-field body waveforms recorded by WWSSN long-period seismograms it has been possible to investigate the degree of complexity of several Turkish earthquakes. The results, which are obtained by matching synthetic P waveforms to observed data indicate that the July 22, 1967 Mudurnu Valley earthquake (M_s = 7.1) is a complex event which can be explained by the superposition of elementary sources with variable amplitudes and source time sequence history. In this regard, it is very similar to the February 4, 1976 Guatemala earthquake (M_s = 7.5). A comparison of these two events indicates that their source-time series ranges from 5 to ca. 20 s and, regardless of the total moment of the earthquake, the moment of the individual events is bounded at around 5 × 10^(26) dyn cm. The November 24, 1976 E. Turkey earthquake (M_s = 7.3), on the other hand, has a complexity which cannot be explained by such a simple model; in this respect, it may be more similar to the Tangshan, China, earthquake and as such, may involve significant thrust, normal or other complications to its faulting mechanism than the strike-slip mechanism of the P-wave first-motion data. The source time history for the 1967 Mudurnu Valley event is used to illustrate its significance in modeling strong ground motion in the near field. The complex source-time series of the 1967 event predicts greater amplitudes (2.5 larger) in strong ground motion than a uniform model scaled to the same size for a station 20 km from the fault. Such complexity is clearly important in understanding what strong ground motion to expect in the near-field of these and other continental strike-slip faults such as the San Andreas.

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Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1982 Published by Elsevier B. V. Received October 1, 1981; accepted for publication October 28, 1981. We acknowledge useful discussions with Nafi Toksoz in regard to the faulting process of the 1976 E. Turkey event. This research was supported by a grant from the National Academy of Sciences, through WDCA for seismology and the U.S. Geological Survey Contract No. 14-08-0001-19265. Contribution No. 3705 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, U.S.A.
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National Academy of SciencesWDCA
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Caltech Division of Geological and Planetary Sciences3705
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Official Citation:Stewart, G. S., & Kanamori, H. (1982). Complexity of rupture in large strike-slip earthquakes in Turkey. Physics of the Earth and Planetary Interiors, 28(1), 70-84. doi:
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ID Code:51315
Deposited On:05 Nov 2014 22:56
Last Modified:10 Nov 2021 19:09

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