地震预警断层参数实时识别方法(FinDer)详解及其性能初步评价  

Detailed analysis and preliminary performance evaluation of the FinDer:A real-time finite fault rupture detector for earthquake early warning

作　　者：卢建旗[1] 李山有[1] LU Jianqi;LI Shanyou(Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China)

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,哈尔滨150080

出　　处：《世界地震工程》2021年第1期152-164,共13页World Earthquake Engineering

基　　金：国家重点研发计划项目(2018YFC1504004);中国地震局工程力学研究所基本科研业务费专项资助项目(2018B02);山东省高校土木结构防灾减灾协同创新中心基金资助(XTZ201901)。

摘　　要：详细阐述了美国加州ShakeAlert地震预警系统中使用的断层破裂参数实时测定方法(FinDer FinDer:Finite Fault Rupture Detector)的技术细节。利用1999年集集Mw7.6级地震、2008年汶川Ms8.0级地震及2013年芦山Ms7.0级地震,以及日本K-NET台网记录的80次中小地震的强震观测数据对该方法的性能进行了评价。结果表明:在密集台网条件下,FinDer方法能够较为准确地实时识别正在发生地震的断层破裂长度和走向以及质心位置,是解决地震预警系统中断层破裂参数实时识别问题的有效手段之一;FinDer方法只能在断层破裂已经发生的条件下,对其长度和走向进行识别,无法预知断层可能的最终长度或最终走向;远场和近场识别是影响该方法准确性的主要因素,也是该方法识别误差的主要来源。In this paper,the technical details of the real time method(FinDer:Finite Fault Rupture Detector)for detection finite fault rupture parameters used in California ShakeAlert earthquake warning system in the United States are described.The performance of this method is evaluated by means of the observational data of the Mw7.6 Chichi earthquake occurred in 1999,the Ms8.0 Wenchuan earthquake occurred in 2008 and the Ms7.0 Lushan earthquake in 2013,and 80 small to moderate earthquakes recorded by the K-NET of Japan.The results show that under the condition of dense seismic network,the FinDer method can accurately predict the fault rupture length L,strikeθ,and orientation of an earthquake in real time.FinDer method can only determine the length and strike of the fault under the condition that the fault rupture has occurred,and cannot predict the possible final length or strike of the fault.The accuracy of near/far-source region classification is the main factor affecting the accuracy of the method and the main source of the error of the method.

关 键 词：地震预警 断层破裂参数 实时识别 卷积 远场和近场识别 

分 类 号：P315.3[天文地球—地震学] P315.7[天文地球—固体地球物理学]