| Research on distinguishing method and mechanism of tidal deformation anomalies before large earthquakes |
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| 作者姓名： | 张晶 陈荣华 杨林章 吉平 |
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| 作者单位： | [1]Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China [2]China Earthquake Network Center, China Earthquake Administration, Beijing 100036, China |
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| 基金项目： | Joint Seismological Science Foundation of China （106013）. |
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| 摘 要： | Introduction There are many researches on modulating and triggering seismic activities by tidal force in China and abroad. Heaton (1975) studied the tidal triggering of seismic activity and discovered that the tidal stress did have an obvious triggering action on the dip-slip or oblique slip great earthquakes. Tidal triggering of earthquakes has been studied for a long time in China, especially in recent years. For example, LI et al (2001) provided the relationship between the solar and luna…
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| 关 键 词： | 地震 地球 体潮 重力 变形异常 |
| 文章编号： | 1000-9116（2006）02-0155-08 |
| 收稿时间： | 2004-11-22 |
| 修稿时间： | 2005-12-21 |
Research on distinguishing method and mechanism of tidal deformation anomalies before large earthquakes |
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| ZHANG Jing,CHEN Rong-hua,YANG Lin-zhang,JI Ping.Research on distinguishing method and mechanism of tidal deformation anomalies before large earthquakes[J].Acta Seismologica Sinica(English Edition),2006,19(2):155-162. |
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| Authors: | ZHANG Jing CHEN Rong-hua YANG Lin-zhang JI Ping |
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| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China
2. China Earthquake Network Center, China Earthquake Administration, Beijing 100036, China |
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| Abstract: | By analyzing the digital tilt tidal observations at Yongsheng station and strain tidal observations at Houma station, this paper suggests that the solid tidal force might trigger tiny abrupt deformation when the seismogenic system enters into an instable critical state. The step and abrupt changes correlate to a certain extent to the direction of tidal force and the orientation and size of tidal shear stress along the fault strike. In the paper, we study for the first time the relationship between deformation anomaly and additional tidal stress in order to approach the physical mechanism of anomalies appeared immediately before earthquakes and the distinguishing method. |
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| Keywords: | tidal force trigger deformation anomaly |
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