利用InSAR技术研究2003年西藏班戈MS6.1地震发震构造

Abstract

Abstract: Bange M_S6.1 earthquake which occurred on 7 July 2013 at the junction of Tibet and Qinghai province are poorly known in seismogenic structure and active nature due to the lack of aftershock distribution data. Focal mechanism solution given by several angencies using far-field wave data shows huge differences.We utilize descending orbit ENVISAT data and D-InSAR technology to obtain the coseismic deformation image along the LOS of this event, then based on this the fault geometry parameters and coseismic slip distribution are also obtained by seismic inversion.The result shows that the seismogenic tectonic of Bange M_S6.1 earthquake is the Botao lake-Tumen fault which controls the west boundary of the Tanggula Mountain.The earthquake fault is a normal fault with a strike of 161°,high dip angle and right lateral.The length of this ruputure is about 10 km.The slip mainly occurs within 3~7 km along the orientation with a maximum slip of 0.26 m and moment magnitude M_W5.6. The normal fault activity of this earthquake is mainly cause by the EW stretch of the Qiangtang land mass and the right-lateral slip is mainly caused by the difference of the both sides of the Tanggula Mountain’s NE-oriented compressional and shortening.

Key words: Seismogenic structure, InSAR, Bange earthquake, Qiangtang land mass

CLC Number:

P315.7

WANG Jin-shuo,WANG Ai-guo,SUN He. Seismogenic Structure of the 2003 Bange, Tibetan M_S6.1 Earthquake Inferred from InSAR Data[J]. EARTHQUAKE, 2017, 37(2): 86-94.

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Seismogenic Structure of the 2003 Bange, Tibetan M_S6.1 Earthquake Inferred from InSAR Data

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Seismogenic Structure of the 2003 Bange, Tibetan MS6.1 Earthquake Inferred from InSAR Data

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Seismogenic Structure of the 2003 Bange, Tibetan M_S6.1 Earthquake Inferred from InSAR Data