Rupture characteristics of the 2018 Palu,Indonesia Mw 7.6 earthquake inverted from teleseismic and InSAR data
作者单位：University of Science and Technology of China China University of Geosciences(Wuhan) Wuhan University Hefei University of Technology
会议名称：《2019年中国地球科学联合学术年会》
会议日期：2019年
学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
关 键 词：2018 Palu earthquake strike-slip fault InSAR Teleseismic waveforms Coseismic rupture
摘 要：We used 24 teleseismic P waves from IRIS data center to calculate dynamic displacements of global seismic stations and use the L-band ALOS-2 imagery to derive the InSAR coseismic displacements with high-precision feature caused by the 2018 Tajikistan *** southern Palu Bay underwent a maximum ground displacement of 2 *** coseismic offsets showed one nearly N-S main fault trace of surface *** fault geometry and its slip distribution are inverted from the interferograms with a finite fault *** further combined the InSAR data with the teleseismic P-wave data to provide a better constraint on the dynamic rupture *** fault geometry inverted by InSAR displacements clearly delineates the Palu-Koro fault(PKF) with an average dip angle of 65° to the east and a secondary unknown sub-parallel normal fault with a dip angle of ～50° to the east,and another combination of main PKF and western sub-fault discovered by Song et al.(2019).Our combined results show that the slip distribution with a peak slip of 7.6 m on the PKF is dominated by strike-slip but with the dipping slip component of 3 m in south segment of the fault *** main rupture zone on PKF is characterized by three asperities,two in the north part that ruptured the surface and one in south part that is buried at depths of 2-12 *** source model yields a moment of 2.87 × 10^20 N·m,corresponding to Mw 7.60.