四川九寨沟M_(S)7.0地震余震序列自动处理结果探讨  

Discussion on the Automatic Processing Results of the Aftershock Sequence of the Jiuzhaigou M_(S)7.0Earthquake,Sichuan

作　　者：刘媛 杨佳佳 鲁志楠 唐涛[1] LIU Yuan;YANG Jiajia;LU Zhinan;TANG Tao(Sichuan Earthquake Agency,Sichuan Chengdu 610041,China)

机构地区：[1]四川省地震局,四川成都610041

出　　处：《四川地震》2025年第1期16-20,共5页Earthquake Research in Sichuan

基　　金：国家自然科学基金委项目(U2039203);四川省地震局地震科技专项(LY2305,LY2304)。

摘　　要：为了检测人工智能方法对地质构造复杂的川西高原地区强震后余震序列的自动处理能力,采用RISP系统对2017年四川九寨沟M_(S)7.0地震序列进行自动处理,并将获得的自动目录结果与人工目录结果进行对比分析。统计结果显示:震后10天内,自动处理产出的目录数为8071个,其数量是人工目录总数的2.9倍;以四川台网产出的2782个人工目录结果为准,采用发震时刻偏差位于-3.0~3.0s和震中位置偏差小于15.0km的原则进行匹配,自动目录能成功匹配2646个,事件匹配率为95.11%;人工目录中的136个地震事件匹配失败,其中,97个地震事件在自动目录中有产出,39个地震事件属于漏检事件,漏检率为1.40%;在成功匹配的地震事件中,发震时刻偏差为-1.0~1.0s的地震占比为85.9%,震中位置偏差小于5.0km的地震占比为83.18%,震级偏差为-0.3~0.3的地震占比为87.26%。结论表明:RISP系统具有一定的地震目录自动化处理能力,检测地震事件的匹配率较高,但仍可以通过进一步改进地震定位方法和区域速度模型来提升系统的自动化处理能力。We tested the processing ability of an artificial intelligence method on the aftershock sequence after a strong earthquake in the western Sichuan Plateau area with a complex geological structure.Taking the 2017 Jiuzhai-gou M_(S)7.0earthquake in Sichuan province as an example,we used the RISP system to retrospectively analyze the earthquake sequence and obtained the automatic processing catalogs,which were then compared with manual cata-logs.According to statistics,8071 catalogs were automatically processed by the RISP system within 10 days after the earthquake,indicating a 2.9-fold increase compared to that of manual catalogs.We based on the 2782 manual catalogs produced by the Sichuan Seismic Network and used the principle on the deviation of earthquake occurrence time less than 3 seconds.Moreover,we considered deviation of earthquake epicenter location with less than 15 km between manual catalogs and automatic catalogs,and successfully matched 2646 events by the automatic catalogue with a matching rate of 95.11%.Comparatively,136 events in the manual catalogue were unable to be matched.Among these unmatched events,97 events were produced in the automatic catalogue,and 39 events were missed with a missed rate of 1.40%.Among the successfully matched events,earthquake with an occurrence time devia-tion between-1.0 and 1.0 seconds accounted for 85.9%,those with an epicentral location deviation of less than 5.0 km accounted for 83.18%,and those with a magnitude deviation between-0.3 and 0.3 accounted for 87.26%.The conclusions indicate that the RISP system shows a certain automatic processing ability for seismic cata-logs,and the results of seismic event detection exhibit a high matching rate.However,the automatic processing a-bility of the system can still be improved by further refining the seismic location method and the regional velocity model.

关 键 词：四川九寨沟M_(S)7.0地震 余震序列 自动目录 人工目录 

分 类 号：P315.3[天文地球—地震学]