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地震 ›› 2001, Vol. 21 ›› Issue (1): 1-6.

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日、月对孕震区的水平引潮力与震源机制的关系*

李延兴1, 许力生2, 胡新康1, 帅平1, 耿洪1, 张中伏1   

  1. 1.中国地震局第一地形变监测中心,天津 300180 ;
    2.中国地震局地球物理研究所,北京 100081
  • 收稿日期:2000-05-22 修回日期:2000-08-17 出版日期:2001-01-31 发布日期:2022-10-27
  • 作者简介:李延兴(1942-),男, 河南尉氏人,研究员, 1994年博士生导师, 主要从事空间大地测量、地壳运动、GPS气象学等方面研究。
  • 基金资助:
    国家重点基础研究发展规划项目(G19980407)资助。

Relation between the horizontal tide force which the sun and moon imposes on the seismogenic zone and the focal mechanism

LI Yan-xing1, XU Li-sheng2, HU Xin-kang1, SHAI Ping1, GENG Hong1, ZHANG Zhong-fu1   

  1. 1. Firs t Land Deformat ion Monit oring Cen ter, CSB, Tianjin 300180, China;
    2. Ins ti tu te of Geophysics, CSB, Beijing 100084, China
  • Received:2000-05-22 Revised:2000-08-17 Online:2001-01-31 Published:2022-10-27

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摘要： 根据计算日、月对孕震区水平引潮力方位角的表达式及美国哈佛大学提供的全球Mw ≥7. 0的矩张量地震目录,选取了1980年1月至1999年12月全球发生的(Mw ≥ 7. 0) 242次地震。利用地震目录中提供的地震矩张量参数,计算了每次地震发震应力场P 轴、T轴的方位角。同时计算了每次地震时日、月对震中区水平引潮力的方位角。将此方位角与P轴、T轴以及二组断层面的走向进行对比分析。结果表明,日、月对震中区的水平引潮力方向与P 轴、T轴的方位角及二组断层面的走向互相平行或互相垂直,其平行或垂直的一致性非常好。平行或垂直相差在10°、20°、30°之内的发震概率分别达到了0. 414、0. 736、0. 945。这个结果表明,日、月对孕震区的水平引潮力与大地震的发生密切相关。并进一步讨论了日、月对孕震区的水平引潮力对大地震发生的调制作用。

关键词: 水平引潮力, 震源机制, 孕震区, 调制作用

Abstract: Based on the earthquake catalogue of the seismic moment tensor supplied by Ha rv ard Univ ersity, 242 earthquakes (MW≥7.0) occurred on the whole globe during the recent 20 years (from January 1,1980 to December 31,1999) areselected. Th us the azimuth expression of the horizo ntal tide fo rce in the seismog enic reg ions is obtained in thi s paper. The axes P and T azimuth of each ea rthquake stress field may be deriv ed from the seismic moment tensor pa rameters from the ear thquake catalo gue, and the azimuth of the ho ri zontal tide fo rce relative to the sun and moon impo ses in the epicenter region, may also be ca lculated. The azimuth of the hori zo ntal tide force is compa red respectively with those of the ax es P and T and two g roups of fault trends, and it can be shownthat they are almo st parallel or perpendicular oneanother and the paral lel or perpendicular accorda nce is very well. The probabilities, for the g rea tear thquake occurrence with the parallel or perpendicular r dif ference within 10°, 20°and 30°, are respectiv ely mo re than 0.414, 0.736 and 0.945. The result shows that there may be a close relation between the sun, moon, the ho ri zontal tide fo rce in the seismog enic reg ions a nd the g reat ea rthquake o ccurrence. In thi s paper, it is further studied that the ho ri zo ntal tide fo rce mig ht play aco nt rolling role in the g reat earthquake occurrence.

Key words: Horizo ntal tide fo rce, Co nt rolling role, Focal mecha nism, Sei smic region

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