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地震 ›› 2001, Vol. 21 ›› Issue (1): 7-13.

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地震前兆形变场研究*

陈绍绪1, 张跃刚1, 平建军1, A. S. Aleksseev2, A. S. Belonos ov2   

  1. 1.河北省地震局, 河北石家庄 050021;
    2.ICM MG of Siberi an Branch of Rus sian Aacademy of Sci ences, Novsibi rsk, Ru ssia 630090
  • 收稿日期:2000-08-02 修回日期:2000-10-13 出版日期:2001-01-31 发布日期:2022-10-27
  • 作者简介:陈绍绪(1941-),男(土家族) ,湖北咸丰人,研究员,主要从事地震预报等研究。
  • 基金资助:
    河北省自然科学基金资助项目(497411)部分成果

Study on the crustal deformation field of seismic precursor

CHEN Shao-xu1, ZHAN GYue-gang1, PING Jian-jun1, A. S. Alecseev2, A. S. Belonosov2   

  1. 1. Seismological Bureau of Hebei Province, Shijiazhuang 050021, China;
    2. ICMM G of Siberian Branch of Rus sian Academy of science, Novsibirsk, Russia 630090
  • Received:2000-08-02 Revised:2000-10-13 Online:2001-01-31 Published:2022-10-27

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摘要： 假设在均匀弹性介质半空间中,存在一单一力源→F,通过求解弹性静力学方程,得到地球表面位移解3个分量( u、v ,w )的解析表达式。讨论了理论垂直形变场的基本特征。力的大小是决定形变幅度的基本因素,力越大,形变幅度亦越大,反之,则越小。力源深度h 越大,形变幅度越小,影响范围越大,反之,形变幅度大,影响范围小。力源倾角为正时(向下) ,形变中心区下降,倾角为负(向上)时,形变中心区隆起。力的方位角是决定形变场图像形态的重要因素。利用大同地区( 1984-1987年)和张北地区( 1984-1991年)水准测量资料反演这二个地区震前力学参数,结果表明,力源中心与实际震中位置相差小于40 km,力的方位角近于水平,理论形变图与实测形变图基本相似。

关键词: 地震前兆, 形变场, 反演, 力学参数

Abstract: On the hypothesis that there is a sing le fo rce →F in the homo geneously elastic half space, and thro ugh so lving elastic sta tics equation, wegot the analytic expression of the 3 component s (u,v,w) of displacement solution on the surface of the ea rth. The basic cha racter of the theo reticv ertical defo rmatio n field is also di scussed. The extent of deforma tion is di rectly propo rtio nal to the st reng th of the force, and is inversely pro portional to the depth of the origin of the force. When the dip ang le of the fo rce is no rmal (dow nw ard), the central defo rmation a rea descends. In the cont ra ry, the cent ral deformation arearises. The dip angle is amain factor to decide the image shape of crustal deformation field. Using the leveling data of Da tong region (1984-1987) and Zhang bei region (1984-1991) weinv ersed the dy namic parameters of the tworegion. The resul tsshow the dif ference betw een the center of the fo rce system and the realepicenter is less than 40 km. Dip angle of force is nearly horizo ntal. Theo retical crustal deformation imageis basically similar to the observed defo rmation image.

Key words: Seismic precursor, Crustal deformation field, Inversion, Dynamic parameter

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