期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 16, 页码 8236-8243出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL074296
关键词
blind fault; reactivated fault; seismotectonics; shear fault-bend folding; inversion tectonics; Lushan earthquake
资金
- National Natural Science Foundation of China [41202142, 41430316, 41572117]
- Project for Sichuan-Yunnan National Earthquake Experimental Field [2017CESE0102]
- Project for Basic Research Work of the Institute of Geology, China Earthquake Administration [IGCEA1422]
On 20 April 2013, an unexpected M-w 6.7 earthquake occurred in Lushan County at the southern Longmen Shan, the eastern margin of the Tibetan Plateau. A high-resolution seismic reflection profile was combined with near-surface geological data, earthquake relocation and geodetic measurements, and a recent deep artificial seismic reflection profile to identify the active fault and seismotectonics of this earthquake. Three-dimensional imaging of the aftershocks was used to identify two planar faults that together form a y shape (f1 and f2). Seismic interpretations suggest that fault f1 did not break through the overlying Mesozoic and Cenozoic rocks and is a typical blind fault. Geodetic measurements suggest that the coseismic deformation is consistent with the geometry and kinematics of shear fault-bend folding. Deep seismic data indicate the syndepositional nature of fault f1 a preexisting normal fault older than the Triassic, which underwent positive inversion tectonics during the Late Cenozoic. A thrust fault f3 converges with f1 at a depth of approximately 12km with an accumulated slip 3.6km. This 2013 Lushan earthquake triggered by blind faults is a hidden earthquake. Blind and reactivated faults increase the potential risk and uncertainty related to earthquakes in the eastern margin of the Tibetan Plateau.
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