| 1989年大同—阳高地震的前兆过程及其场—源特征 |
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| 引用本文： | 高旭,李志雄.1989年大同—阳高地震的前兆过程及其场—源特征[J].地震,1994(6):1-10. |
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| 作者姓名： | 高旭 李志雄 |
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| 作者单位： | 国家地震局分析预报中心，国家地震局 中国北京 100036，中国北京 100036 |
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| 摘 要： | 本文对１９８９年山西大同－阳高６．１级地震的前兆过程及其场、源特征进行了综合研究，结果表明，大同－阳高地震震前较为丰富的前兆现象是震源应力场与区域应力场共同作用的结果，估计大同地震的震源区尺度为２０－３０ｋｍ，孕震区范围约２００ｋｍ。最早的异常（震前３－４年）表现为大同盆地沉降速率加大，且出现在震源区，然后扩展至孕震区边缘，在孕震区边缘（１５０－２００ｋｍ）存在中、短期异常的突出集中区，在孕震过程
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| 关 键 词： | 前兆过程 综合分析 地震前兆 震源 |
PRECURSORY PROCESS OF THE DATONG-YANGGAO EARTHQUAKE IN 1989 AND ITS FIELD-SOURCE FEATURES |
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| Gao Xu.PRECURSORY PROCESS OF THE DATONG-YANGGAO EARTHQUAKE IN 1989 AND ITS FIELD-SOURCE FEATURES[J].Earthquake,1994(6):1-10. |
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| Authors: | Gao Xu |
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| Abstract: | Based on analysis of the precursory data of Datong-Yanggao earthquake Ms 6.1 in 1989, the comprehensive study on the precursory of the event and its field-source features are made. The results show that the abundant precursory phenomena prior to the earthquake are resulted from the mutual reaction between the seismic source stress field and regional stress field. The size of the seismic source is estimated about 20 or 30 km and size of seismogenic area is about 200 km. The increment of subsidence ra-te of Datong basin is the earliest precursor, which gradually extended to the margin of the seismic source area. On the margin of the seismic source area (150 -200 km away from the epicenter) there is the precursor- concentrated area. During the medium-term and sort-term process of the earthquake prediction precursory seis-mic gap appeared around the seismic source, and it disappeared with the gradual con-traction of the short-term and imminent precursors towards the seismic source. The possible mechanism of the above-mentioned phenomenon is discussed in the paper from the view of the field-source reaction and stress concentration of multiple sources. |
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| Keywords: | precursory process comprehensive analysis field-source feature |
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