2022年6月10日四川马尔康地震序列实时智能检测结果分析与研究

Real-time automatic detection results for the Maerkang,Sichuan earthquake sequence on June 10,2022

首先利用RISP系统对2022年6月10日0—12时四川马尔康地震序列的实时自动检测结果,并结合人工定位结果,对该时段系统自动检测结果进行详细对比分析。结果表明:系统自动检测的地震数量是人工正式目录的1.98倍,匹配率为93.2%,其中发震时刻偏差小于±1.0 s的地震占比95.64%;震中位置偏差小于10 km的地震占比97.09%;震级偏差小于±0.3级的地震占比96.36%。然后对系统多检测、漏检测和与人工目录地震参数偏差较大的地震进行详细分析,对系统检测密集地震序列的优缺点进行总结,并给出优化系统的建议。综合来看,RISP系统可快速产出高精度的震相到时数据和完备性较高的地震目录,可用于震后趋势判定、震源机制解节面判定、余震快速精定位等地震应急工作。

In this study,the RISP system was used to obtain the real-time automatic detection results of the Maerkang,Sichuan earthquake sequence from 0:00 to 12:00 on June 10,2022.The automatic detection results were then analyzed and compared with the manual positioning results.The comparison results revealed that the number of earthquakes in the automatic catalog was 1.98 times that in the manual catalog,and the matching rate was 93.2%.Earthquakes with an occurrence time deviation of less than±1.0 s accounted for 95.64%;those with an epicenter position deviation of less than 10 km accounted for 97.09%;and those with a magnitude deviation of less than±0.3 accounted for 96.36%.The earthquakes detected and missed by the RISP system,as well as those with large deviations in earthquake parameters from the manual catalog,were analyzed.The advantages and disadvantages of the system for detecting dense earthquake sequences were summarized,and preliminary suggestions for optimizing the system were given.The RISP system can quickly produce the high-precision arrival date of the seismic phase and earthquake catalog with high completeness.Such information can be used for the determination of postearthquake trends and focal mechanism nodes,the rapid and precise positioning of aftershocks,and other earthquake emergency work.Therefore,the RISP system can quickly obtain high-precision seismic phase arrival data and the complete earthquake catalog and can thus be applied in earthquake emergency response work.