| A new model on the cause of Tangshan earthquakes in 1976 |
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| 作者姓名： | 王健 |
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| 作者单位： | WANG Jian Institute of Geophysics，China Seismological Bureau，Beijing 100081，China |
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| 摘 要： | Introduction The Tangshan earthquake sequence in 1976 is one of most important events in North China. Although nearly thirty years passed and there are some researches on its cause, it is far from the end. Here we introduce two explanations for the cause of Tangshan earthquakes and point out their defects. One is that there is a diamond block in NEE direction in Tangshan region, which is shaped by cutting action of NingheChangli fault, FengtaiYejituo fault, Luanxian fault and Jiyunhe fau…
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| 收稿时间： | 8 November 2000 |
| 修稿时间： | 18 June 2001 |
A new model on the cause of Tangshan earthquakes in 1976 |
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| WANG Jian.A new model on the cause of Tangshan earthquakes in 1976[J].Acta Seismologica Sinica(English Edition),2001,14(5):589-595. |
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| Authors: | WANG Jian |
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| Institution: | Institute of Geophysics, China Seismological Bureau, |
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| Abstract: | In this paper the shortages of explanations on the cause of Tangshan earthquakes in 1976 are pointed out. Earth-quake phenomena around Tangshan earthquakes are analyzed synthetically, it is noticed that the most prominent seismic phenomenon are seismic denseness of ML=4, but ML=3 and ML=2 is not active in the same tempo-ral-spatial interval, which occurred from 1973 to 1975. We think that the phenomenon should correspond to rela-tive integrity of the crust medium under higher regional stress. Assuming that the seismicity in circumjacent region could reflect the jostling extent of surrounding plates toward the Chinese mainland, it is inferred that there are multi-dynamical processes in North China region in 1970s, which supply the basic dynamical source to Tangshan earthquakes. A model of multi-dynamical processes and local weakening of the crust is proposed to explain the cause of Tangshan earthquakes. This model could unpuzzle many seismic phenomena related to Tangshan earth-quakes. |
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| Keywords: | Tangshan earthquakes seismicity local weakening of crust |
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