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

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...

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

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 M_w7.6 Chichi earthquake occurred in 1999, the M_s8.0 Wenchuan earthquake occurred in 2008 and the M_s7.0 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, strike θ, 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.