| 唐山7.8级强震前震中周围形变电阻率的下降异常 |
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| 引用本文： | 赵玉林,钱复业.唐山7.8级强震前震中周围形变电阻率的下降异常[J].地球物理学报,1978,21(3):181-190. |
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| 作者姓名： | 赵玉林 钱复业 |
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| 作者单位： | 国家地震局 |
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| 摘 要： | 1976年7月28日唐山7.8级强震前,北京、天津、唐山地区已布设14个形变电阻率观测台站,其中9个台,震前2-3年内记录到形变电阻率长趋势下降异常,这9个台围绕震中形成一个半长轴可达150公里的异常区.位于震中区的两个台还记录到临震前2-3个月内的加速下降异常.根据现场条件下地表浅部岩（土）层受压时,视电阻率下降的实验结果,认为在震中周围较大的区域内,震前浅部岩（土）层被压密,其压缩线应变的数量级约为3×10-5.这一认识得到唐山震前地面基线实测资料的支持.
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| 关 键 词： | 形变 唐山 视电阻率 震前 强震 前震 震中 中周 长趋势 矽化 |
| 收稿时间： | 1977-07-08 |
ELECTRICAL RESISTIVITY ANOMALY OBSERVED IN AND AROUND THE EPICENTRAL AREA PRIOR TO THE TANGSHAN EARTHQUAKE OF 1976 |
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| ZHAO YU-LIN,QIAN FU-YE.ELECTRICAL RESISTIVITY ANOMALY OBSERVED IN AND AROUND THE EPICENTRAL AREA PRIOR TO THE TANGSHAN EARTHQUAKE OF 1976[J].Chinese Journal of Geophysics,1978,21(3):181-190. |
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| Authors: | ZHAO YU-LIN QIAN FU-YE |
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| Institution: | State Seismological Bureau |
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| Abstract: | Before the Tangshan earthquake, magnitude 7.8 on July 28, 1976, nine of the fourteen resistivity stations located within the region of Peking, Tientsin and Tangshan recorded gradual decreases in apparent electrical resistivity for a period of 2-3 years. The anomalous region as deduced from the records of these nine stations has a semi-major axis of about 150 km surrounding the epicenter and yet two of the stations located very close to the epicenter recorded rapidly decreasing apparent resistivity anomaly during a period of more than 2 months immediately before the earthquake. According to results of some field measurements in-situ of the apparent resistivity decrease due to compression of rock or soil layers near earth's surface, we estimated that the linear compressional strain of shallow layers in and around the epicentral area is about 3 × 10-5. Compressional strain of much the same order of magnitude has been observed by base line survey before the Tangshan earthquake. |
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