2016年11月25日新疆阿克陶M_S6.7地震序列应力降变化特征

EARTHQUAKE SEQUENCE STRESS DROP VARIATION CHARACTERISTIC OF XINJIANG AKETAO EARTHQUAKE WITH M_S6.7 ON NOV 25^(th),2016

利用阿克陶M_S6.7地震震中170 km范围内的4个台站(乌恰台、喀什台、阿图什台、喀什中继台)所记录的震源区附近53次M_S3.0以上事件的数字波形资料,采用Brune圆盘模型计算了此次地震序列的应力降,得到该序列的应力降时序变化曲线。经初步分析后认为,阿克陶M_S6.7地震序列的震源参数中矩震级,震源半径和地震矩随着震级的增大而增大,呈正相关关系。拐角频率随着震级的增大而减小,呈负相关关系。应力降值和震级呈多重标度关系,和深度的相关性并不明显。目前余震序列应力降值处于高值状态,后续有发生强余震的可能。

Aketao earthquake with Ms6.7 sequence stress drop value was calculated with digital wave of 53 Ms3.0 earthquakes recorded by four stations （WUQ, KSH, ATS, KSZ） within the epicenter of 170 km by using the Brune model. After the preliminary analysis, relation was positive among seismic magnitude, moment magnitude, seismic moment and hypocenter scale. Relation was opposite among seismic magnitude and corner frequency. Stress drop and magnitude belonged to multi-scale relationship, and the depth of correlation was not obvious. At present, stress drop of aftershocks was at high value, and there was possibility of strong aftershocks.