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《中国科学:地球科学(英文版)》 2017-05
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Activity of the Lenglongling fault system and seismotectonics of the 2016 M_S6.4 Menyuan earthquake

GUO Peng;HAN ZhuJun;AN YanFen;JIANG WenLiang;MAO ZeBin;FENG Wei;Key Laboratory of Active Tectonics and Volcano, Institute of Geology,China Earthquake Administration;Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics,China Earthquake Administration;China University of Geosciences, School of Earth Sciences and Resources;Institute of Earthquake Science,China Earthquake Administration;China Earthquake Networks Center;  
The MS6.4 Menyuan earthquake occurred on the northern side of the Lenglongling fault(LLLF) in the mid-western of the Qilian-Haiyuan fault zone on January 21, 2016. The earthquake epicenter was distant from the Minle-Damaying and Huangcheng-Shuangta faults, eastern of the Northern Qilian Shan fault zone. A near northwest-striking rupture plane intersects the two faults at a certain angle. The focal mechanism solution shows that this was a thrust-type earthquake, slightly different from the strike-slip movement with a thrust component of the LLLF. Field geological mapping, tectonic geomorphology analysis, trench excavation and 14 C dating reveal that(1) the LLLF has been obviously active since the Holocene, and may behave with characteristic slip behavior and produce M_W7.3–7.5 earthquakes;(2) the LLLF appears as a flower structure in terms of structure style, and dips NNE at a steep angle; and(3) the most recent earthquake event occurred after 1815–1065 a BP. An associated fault, the Northern Lenglongling fault(NLLLF), is located at the northwestern end of the LLLF. Consequently, the NLLLF was continually subject to tectonic pushing effects from the left-lateral shear at the end of the LLLF, and, accordingly, it bent and rotated outward tectonically.Subsequently, the fault deviated from the dominant rupture azimuth and activity weakened. In the late Quaternary, it behaved as a thrust fault with no obvious deformation at the surface. This is indicated by the arc shape, with a micro-protrusion northeastward,and no geologic or geomorphic signs of surface rupturing since the late Quaternary. However, such faults could still rupture at depth, producing moderate-strong earthquakes. The geometric and kinematic properties of the NLLLF are in good agreement with the occurrence and kinematic properties of nodal plane 2, and with the distribution characteristics of the aftershocks and seismic intensity. Therefore, the NLLLF is a more suitable seismogenic structure for the MS 6.4 Menyuan earthquake. In addition, the thrust movement of the NLLLF accommodates subsequent movement of the LLLF. During the historical evolution of the NLLLF,the LLLF and the NLLLF have affected the local topography through tectonic uplift.
【Fund】: supported by a Special Project on Earthquake Research the China Active Fault Survey Project—The South-North Seismic Zone Northern Segment (Grant No. 201408023);; Fundamental Research Funds in Institute of Crustal Dynamics China Earthquake Administration (Grant No. ZDJ2015-16)
【CateGory Index】: P315.2
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