九寨沟M7.0级地震余震目录完备性研究

2017年四川省九寨沟县M 7.0级地震发生后,截止到8月24日共16天内时间内地震台网中心记录到5994个九寨沟地震余震事件,为完备该地震的余震目录,本文利用模板匹配方法对本次地震进行了遗漏地震检测研究,选取震中附近台站记录波形为计算数据,重新检测主震后16天时间内的遗漏地震事件,共得到台网目录外地震目录1053个,与台网给出目录相比增加了0.18倍.为比较本次地震检测前后的最小完整性震级以及活动性b值,利用包络差峰值振幅对检测地震的震级进行了估算,根据检测后的余震目录得到九寨沟地震余震序列的最小完整性震级为M_L 0.9,地震活动性b值为0.80左右,较原目录的M_L 1.2和0.85均有降低.

Missing earthquakes detection and completeness of earthquake catalogues of the 2017 Jiuzhaigou M 7.0 earthquake

After the M 7.0 earthquake occurred in Jiuzhaigou county,Sichuan province in china,in 2017,there were total 5994 aftershocks had been recorded in the China earthquake networks center within 16 days until August 24. In order to complete the aftershocks catalog of Jiuzhaigou earthquake,this paper used the template matching method to carry out the missing earthquake detection research,selected the recorded waveforms of stations near the epicenter as the calculation data,and detected the main earthquake For the missing earthquake events in 16 days,we found orther 1053 earthquake catalogue out of the network catalogue,which was 0.18 times higher than the catalogue given by the China earthquake networks center.In order to compare the minimum integrity magnitude and seismic activity b value before and after the earthquake detection,the magnitude of the detected earthquake was estimated by using the peak amplitude of envelope difference.According to the detected aftershock catalogue,the minimum integrity magnitude of the aftershock sequence of Jiuzhaigou earthquake is ML 0.9,and the seismic activity b value is about 0.80,which is lower than the original catalogue ML 1.2 and 0.85.