| 唐山7.8级强震孕育过程的地震活动性特征 |
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| 引用本文： | 陈章立,薛峰,吕培苓,郑斯华.唐山7.8级强震孕育过程的地震活动性特征[J].西北地震学报,1981,3(4):9-16. |
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| 作者姓名： | 陈章立 薛峰 吕培苓 郑斯华 |
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| 作者单位： | 国家地震局分析预报中心
(陈章立，薛峰，吕培苓)，国家地震局分析预报中心(郑斯华) |
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| 摘 要： | 本文研究了唐山7.8级强震孕育的各个阶段,尤其是中期阶段的区域地震活动性的主要特征。指出1975年后,异常的转折及主震的低应力降等现象表明,强震可能发生于应力峰值之后的下降段。由震前震源周围地温的增高推测,在应力下降的同时,由于热软化作用,介质强度迅速降低,导致强震发生。
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| 收稿时间： | 1981/2/28 0:00:00 |
CHARACTERISTICS OF SEISMICITY ASSOCIATED WITH DEVELOPMENT OF TANGSHAN EARTHQUAKE(Ms=7.8)OCCURRED ON JULY28,1976 |
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| Chen Zhangli,Xue Feng,L&#; Peiling and Zheng Sihua.CHARACTERISTICS OF SEISMICITY ASSOCIATED WITH DEVELOPMENT OF TANGSHAN EARTHQUAKE(Ms=7.8)OCCURRED ON JULY28,1976[J].Northwestern Seismological Journal,1981,3(4):9-16. |
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| Authors: | Chen Zhangli Xue Feng L&#; Peiling and Zheng Sihua |
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| Institution: | Center of Analysis and Prediction, State Seismological Bureau,Center of Analysis and Prediction, State Seismological Bureau,Center of Analysis and Prediction, State Seismological Bureau and Center of Analysis and Prediction, State Seismological Bureau |
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| Abstract: | In this paper, we have discussed the principal characteristics of the regional seismicity before the Tangshan earthquake(Ms=7.8) in particular during the mid-range of the development of the strong earthquake. After 1975 year, the anomalous variations undergo transition and recovery. These phenomena and low stress drop of main shock may show that during a period before the strong earthquake, the stress decreased with the further development of the strain.Analysising the anomalous increasing of ground-temperature near the seismic centre since 1975 year, it is suggested it is possible that as hot matter gush up from the deep of the earth,the strength of the medium decrease, so that the strong earthquake takes place. |
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