Synthesis of accelerations of the 1976 Tangshan earthquake ( M S 7.8) in near- and far-field by using semi-empirical method |
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Authors: | Qi-Feng Luo and Yu-Xian Hu |
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Institution: | (1) Institute of Structural Theory, Tongji University, 200092 Shanghai, China;(2) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China |
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Abstract: | In this paper a heterogeneous fault model of the Tangshan earthquake is suggested, which consists of two southern sub-faults
striking N30°E and two northern sub-faults striking N50°E. Total length of the main shock fault is 114 km and seismic moment
is about 1.4 × 1020 N·m. The epicentre of the main shock is located at the southern part, near the intersection of the two bands. Accelerations
of two aftershocks (M
L 5.5, M
S 6.9) were used as empirical Green’s functions to synthesize the accelerations of the main shock in near and far field. A
method that small events and main shock are considered not satisfying the similarity relationship in the improved empirical
Green’s function is also applied in this paper. Peak values, duration and response spectra of synthesized accelerations in
far field are in agreement with the observed records. The synthesized results in near field are also in agreement with the
epicentral intensity distribution of the main shock. The results show that the peak acceleration of Tangshan earthquake in
epicentral region exceeds 1.1 g. It is consistent with the peak accelerations recorded in some large earthquakes occurred
in recent years.
The research is supported by the National Science Foundation of China. |
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Keywords: | Tangshan earthquake empirical Green’ s function accelerogram synthesis |
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