COSEISMIC SURFACE RUPTURES AND SEISMOGENIC MUJI FAULT OF THE 25 NOVEMBER 2016 ARKETAO MW6.6 EARTHQUAKE IN NORTHERN PAMIR

doi:10.3969/j.issn.0253-4967.2016.04.028

Abstract

Abstract:

The M_W6.6 Arketao earthquake,which occurred at 14:24:30 UTC 25 November 2016 was the largest earthquake to strike the sparsely inhabited Muji Basin of the Kongur extension system in the eastern Pamir since the M 7 1895 Tashkurgan earthquake.The preliminary field work,sentinel-1A radar interferometry,and relocated hypocenters of earthquake sequences show that the earthquake consists of at least two sub-events and ruptured at least 77km long of the active Muji dextral-slip fault,and the rupture from this right-lateral earthquake propagated mostly unilaterally to the east and up-dip.Tectonic surface rupture with dextral slip of up to 20cm was observed on two tens-meter long segments near the CENC epicenter and 32.6km to the east along the Muji Fault,the later was along a previously existing strand of the Holocene Muji fault scarps.Focal mechanisms are consistent with right-lateral motion along a plane striking 107°,dipping 76° to the south,with a rake of 174°.This plane is compatible with the observed tectonic surface rupture.More than 388 aftershocks were detected and located using a double-difference technique.The mainshock is relocated at the Muji Fault with a depth of 9.3km.The relocated hypocenters of the 2016 Arketao earthquake sequence showed a more than 85km long,less than 8km wide,and 5~13km deep,NWW trending streak of seismicity to the south of the Muji Fault.The focal mechanism and mapping of the surface rupture helped to document the south-dipping fault plane of the mainshock.The listric Muji Fault is outlined by the well-resolved south-dipping streak of seismicity.The 2016 Arketao M_W6.6 and 2015 Murghob M_W7.2 earthquakes highlight the importance role of strike-slip faulting in accommodating both east-west extensional and north-south compressional forces in the Pamir interior,and demonstrate that the present-day stress and deformation patterns in the northern Pamir plateau are dominant by east-west extension in the shallow upper crust.

Key words: Pamir, Arketao M_W6.6 earthquake, surface rupture, InSAR, aftershock, Muji fault

摘要：

新疆阿克陶M_W6.6地震发生在帕米尔构造结北部木吉断陷盆地西端附近，是公格尔拉张系自1895年塔什库尔干7级地震以来发生的最大地震。对于此次地震的研究，不仅对理解帕米尔高原内部现今构造变形、应力状态及动力学过程等非常重要，也将为该区的未来强震趋势预测提供依据。高分辨率卫星影像解译、初步的野外考察、InSAR数据分析以及主余震重新定位结果表明，阿克陶M_W6.6地震破裂走向107°、倾角76°，发震断层是公格尔拉张系最北段的全新世活动转换断层——NWW走向的木吉右旋走滑断裂。该地震破裂长度超过77km，可能包括了至少2次破裂子事件。沿木吉断裂在2处（中国地震台网测定的震中以东2.4km及其以东约32.6km附近）发现了数十米长、走向95°~110°、小规模右旋张扭地表破裂带，走滑量10~20cm。这一结果与张勇等在震后2h给出的震源破裂过程一致。重新定位的主震位于木吉断裂上，震源深度约9.3km。绝大多数余震主要分布在木吉断裂南侧1走向NWW、长逾85km、宽<8km、深5~13km的条带内。余震带的北边界上陡下缓，很好地限定了木吉断裂的铲形深部几何结构。这次地震的发生表明帕米尔高原内部上地壳变形仍以近EW向拉张为主。

关键词: 帕米尔, 阿克陶地震, 地表破裂, InSAR, 余震, 木吉断裂

CLC Number:

P315.2

CHEN Jie, LI Tao, SUN Jian-bao, FANG Li-hua, YAO Yuan, Li Yue-hua, WANG Hao-ran, FU Bo. COSEISMIC SURFACE RUPTURES AND SEISMOGENIC MUJI FAULT OF THE 25 NOVEMBER 2016 ARKETAO M_W6.6 EARTHQUAKE IN NORTHERN PAMIR[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(4): 1160-1174.

陈杰, 李涛, 孙建宝, 房立华, 姚远, 李跃华, 王浩然, 付博. 2016年11月25日新疆阿克陶M_W6.6地震发震构造与地表破裂[J]. 地震地质, 2016, 38(4): 1160-1174.

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