2016年11月25日阿克陶M_S6.7地震序列特征及后续趋势分析

SEISMIC SEQUENCE CHARACTERISTIC AND ITS FOLLOW-UP TRENDS OF AKETAO EARTHQUAKE WITH M_S6.7 ON NOV 25^(th),2016

介绍2016年11月25日新疆阿克陶M_S6.7地震的基本参数、震源机制、序列类型、地震序列衰减特征和余震序列各项数字地震学资料,并就该序列与历史地震序列进行对比,提出震后趋势判定意见。结果显示,该序列为主-余型,余震序列衰减迅速,在较强余震前,序列P波初动呈现较好的一致性,振幅比表现出显著的低值过程,应力降和视应力则出现多点的高值突跳,这些异常的出现在时间上具有同步性。相较于历史地震序列,本次地震序列频度和强度均明显偏弱,且余震破裂尺度相对较大,判定后续存在发生强余震的可能。

Introduced basic parameters, focal mechanism solution, sequence type, attenuation characteristic of seismic sequence and digital seismological data of Aketao earthquake with Ms6.7 in Xinjiang on November 25th, 2016. The sequence was compared with historical earthquake sequence and proposed trend of earthquake sequence. Results showed that the sequence was mainshouck-aftershock sequence, and aftershock sequence decayed rapidly. Before stronger aftershocks, P wave first motion of sequence showed a good consistency, and amplitude ratio showed a significant low value process, stress drop and apparent stress had many points of high value of sudden jump, these abnormalities in the time with the synchronization sign. Compared with the historical earthquake sequence, frequency and intensity of the earthquake sequence were obviously weak, and scale of the aftershocks was relatively large, and it concluded that there was a possibility of strong aftershocks.