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| 地震前地表重力场变化的一种可能解释——应力-损伤耦合效应 | |
| 引用本文： | 陈兵,江在森,祝意青,张晓亮,楼志文.地震前地表重力场变化的一种可能解释——应力-损伤耦合效应[J].地震地质,2003,25(4):625-631. |
| 作者姓名： | 陈兵 江在森 祝意青 张晓亮 楼志文 |
| 作者单位： | 1. 中国地震局第二监测中心,西安,710054 2. 中国地震局分析预报中心,北京,100036 3. 西安交通大学建筑工程与力学学院,西安,710049 |
| 基金项目： | 国家重点基础研究发展计划(973计划)，地震科学联合基金，G1998040703，101118，， |
| 摘 要： | 文中运用损伤力学研究方法 ,提出孕震过程中引起地壳破坏的应力 -损伤耦合效应。利用应变等效性假设 ,推导了地壳体的应力 -损伤耦合效应与地表重力变化之间的理论关系。根据岩石力学实验的不同加载途径 ,模拟了 1976年唐山 7 8级地震和 2 0 0 1年昆仑山口西 8 1级地震重力演化的不同特征 ,结果与实际情况符合较好 ,表明应力 -损伤耦合效应可以作为地震前地壳重力变化的一种物理解释 |
| 关 键 词： | 应力 损伤 耦合效应 重力变化 |
| 文章编号： | 0253-4967(2003)04-0625-07 |
| 修稿时间： | 2002年5月8日 |
STRESS-FAILURE COUPLING EFFECT:A POSSIBLE EXPLANATION FOR GRAVITY VARIATION BEFORE EARTHQUAKE |
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| CHEN Bing JIANG Zai sen ZHU Yi qing ZHANG Xiao liang LOU Zhi wen The Second Monitoring Center For Crustal Deformation,China Seismological Bureau,Xi'an ,China Center for Analysis and Prediction,China Seismological Bureau,Beijing ,China Architectural Engineering and Mechanics College,Xi'an Jiaotong University,Xi'an ,China.STRESS-FAILURE COUPLING EFFECT:A POSSIBLE EXPLANATION FOR GRAVITY VARIATION BEFORE EARTHQUAKE[J].Seismology and Geology,2003,25(4):625-631. | |
| Authors: | CHEN Bing JIANG Zai sen ZHU Yi qing ZHANG Xiao liang LOU Zhi wen The Second Monitoring Center For Crustal Deformation China Seismological Bureau Xi'an China Center for Analysis and Prediction China Seismological Bureau Beijing China Architectural Engineering and Mechanics College Xi'an Jiaotong University Xi'an China |
| Affiliation: | CHEN Bing 1) JIANG Zai sen 2) ZHU Yi qing 1) ZHANG Xiao liang 1) LOU Zhi wen 3) 1) The Second Monitoring Center For Crustal Deformation,China Seismological Bureau,Xi'an 710054,China 2) Center for Analysis and Prediction,China Seismological Bureau,Beijing 100036,China 3) Architectural Engineering and Mechanics College,Xi'an Jiaotong University,Xi'an 710049,China |
| Abstract: | Early in the 60s-70s of the 20th century, Japanese and American scientists have successfully observed the variation of gravity associated with earthquake process. In China, many researchers have studied the gravity field of some typical earthquakes. The results showed that observable variations of gravity do exist during the development process of medium strong earthquakes, and that different earthquakes have different features of gravity variation. It is considered that the density variation in the crust may be an important factor. In this paper a model of stress failure coupling effect is proposed in the light of failure mechanism. In addition, the theoretical relation between the stress failure coupling effect and variation of gravity in the crust is derived according to strain equivalent hypothesis. Furthermore, the different features of gravity evolution during the development processes of the Tangshan earthquake ( M S7.8) in 1976 and the Kunlun earthquake ( M S8 1) in 2001 are simulated through rock mechanical test with various loading paths. The results are something in good agreement with the actual facts and show that the stress failure coupling effect may be a physical explanation of gravity change before earthquake. |
| Keywords: | stress failure coupling effect gravity variation |
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