2018年11月25日新疆博乐MS4.9地震余震检测与目录完整性研究

Research for Aftershock Detection and Completeness of Earthquake Catalogues of the Bole Ms4.9 Earthquake in November 2018

本文基于匹配滤波技术,通过SEPD(Seismic Events and Phase Detection)对2018年11月25日新疆博乐MS4.9地震序列进行检测,检测出遗漏地震32条,84.4%地震为ML0.0-1.0,9.4%地震小于ML0.0,较地震目录中原有15条地震多213%,检测出的遗漏地震事件使地震目录更加完整。检测后的最小完整性震级由检测前的ML1.6减至ML0.8,地震目录最小完整性震级的减小有利于地震工作者对区域地震活动性作出更准确全面的结论,并使地震危险性分析更可靠。

Based on matched filter technique and by SEPD software,aftershock sequence to earthquake of Xinjinag Bole during 25th to 27th in november 2018 was detected,and 32 missing earthquakes were found.The missing earthquakes during ML0.0〜1.0 is 84.4%,the earthquakes less than ML0.0 is 9.4%.The amount of detected earthquakes is 213%more than the 14 earthquakes in catalogues,and the eaethquakes catalogue become more complete.The minimum integrity magnitude reduce from ML1.6 to ML0.8 after detection.The reduced of minimum integrity magnitude in the whole earthquakes catalogues is in favor of more accurately and roundly research for activity of area earthquake and more reliable to seismic hazard analysis.