用混合源模型研究矿山地震震源机制

RESEARCH ON THE MECHANISM OF MINING TREMORS FROM THE COMBINED SOURCE MODEL

摘要:

本文讨论了矿山地震的混合源机制问题,并根据内源矩张量分解的特点提出了一种较合理的点源混合机制以及拟合求解方法。这相当于利用P波初动振幅进行相对矩张量反演,对于区分双力偶事件和非双力偶事件是有意义的。在简化情况下,对1987年发生在门头沟煤矿的15次事件进行了讨论,发现它们大多属于剪切事件。

Abstract:

In this paper,the combined mechanism of mining tremors is discussed and a reasonable combined point-source mechanism with its solution is proposed in consderation of decomposi-tion of interior source's moment tensor,that means inversion of relative moment tensor by theuse of first motion amplitudes which is valuable for us to distinguish double-couple events and non-double-couple events.
Fifteen tremors observed in Mentougou Mine in 1987 are studied in simplified way,as a result most of them are double-couple events.