摘要
本文收集了1986年11月10日北京顺义M_s4.2级地震(主震)前后河北区域台网记录到的小震波谱最大振幅资料,利用P、S最大振幅比及P波初动资料,根据Delta矩阵的分离形式,对波场基本传播项进行重新组合,计算出记录资料较好的小震机制解参数。结果表明,顺义地震震中区及其附近小震主压应力(P)轴分布比较集中,并且在“主震”前小震机制解一致性较好,主震之后较前者有一定的紊乱,这可能是识别主震的一个标志。
After collecting the maximum amplitude data of small shock spectrum observed by local seismic network in Hebei from Shunyi 4. 2 main shock (on Nov. 10,1986) ,the author made the use of the data of maximum amplitude ratio P,S and initial P wave to reconstitute the basic propagation idems in the wave field by Delta's matrix split form,and a satisfied recording parameter of small earthquake mechanism solution was got after calculation. The final result shows that the principal axis (P) of compressive stress of those small shocks are distributed concentrately to the epicentral region, and before the 'main shock',the small earthquake mechanism solution is congruent but later appears some disorders after the main shock . The author regarded this feature a remark of how to recognize the main shock.
出处
《内陆地震》
1992年第4期351-358,共8页
Inland Earthquake
基金
地震科学联合基金
关键词
北京
小震机制解
最大振幅比
地震
Beijing Shunyi Solution of small earthquake mechanism Maximum amplitude ratio
