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《Earthquake》 2001-01
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Relation between the horizontal tide force which the sun and moon imposes on the seismogenic zone and the focal mechanism

LI Yan xing 1, XU Li sheng 2, HU Xin kang 1, SHAI Ping 1, GENG Hong 1, ZHANG Zhong fu 1 (1. First Land Deformation Monitoring Center, CSB, Tianjin 300180, China; 2. Institute of Geophysics, CSB, Beijing 100084, China)  
Based on the earthquake catalogue of the seismic moment tensor supplied by Harvard University, 242 earthquakes (M W ≥7.0) occurred on the whole globe during the recent 20 years (from January 1, 1980 to December 31, 1999) are selected. Thus the azimuth expression of the horizontal tide force in the seismogenic regions is obtained in this paper. The axes P and T azimuth of each earthquake stress field may be derived from the seismic moment tensor parameters from the earthquake catalogue, and the azimuth of the horizontal tide force relative to the sun and moon imposes in the epicenter region, may also be calculated. The azimuth of the horizontal tide force is compared respectively with those of the axes P and T and two groups of fault trends, and it can be shown that they are almost parallel or perpendicular one another and the parallel or perpendicular accordance is very well. The probabilities, for the great earthquake occurrence with the parallel or perpendicular difference within 10°, 20°and 30°, are respectively more than 0.414, 0.736 and 0.945. The result shows that there may be a close relation between the sun, moon, the horizontal tide force in the seismogenic regions and the great earthquake occurrence. In this paper, it is further studied that the horizontal tide force might play a controlling role in the great earthquake occurrence.
【Fund】: 国家重点基础研究发展规划项目!(G1 9980 4 0 7)资助
【CateGory Index】: P315.72
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