QUATERNARY ACTIVE CHARACTERISTICS OF THE LIUMUGAO FAULT IN THE NORTHERN SEGMENT OF THE NIUSHOUSHAN-LUOSHAN FAULT

GONG Wang-bin; SHI Wei; CHEN Hong; QIU Shi-dong; YIN Yan-guang; ZHAO Yi

2016 Vol. 22, No. 4

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GONG Wang-bin, SHI Wei, CHEN Hong, QIU Shi-dong, YIN Yan-guang, ZHAO Yi. QUATERNARY ACTIVE CHARACTERISTICS OF THE LIUMUGAO FAULT IN THE NORTHERN SEGMENT OF THE NIUSHOUSHAN-LUOSHAN FAULT[J]. Journal of Geomechanics, 2016, 22(4): 1004-1014.

Citation:

QUATERNARY ACTIVE CHARACTERISTICS OF THE LIUMUGAO FAULT IN THE NORTHERN SEGMENT OF THE NIUSHOUSHAN-LUOSHAN FAULT

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
China Geological Survey, Beijing 100037, China
3.
School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 15 September 2016

Publish Date: 25 December 2016

Abstract

Abstract

The Niushoushan-Luoshan fault is located in the northeastern margin of the arcuate structure zone in the northeastern Tibetan Plateau, consisting of Guyuan, Eastern Luoshan, Niushoushan and Sanguankou faults from south to north. In this study, we defined the geometry and kinematics, and evolution of the Liumugao fault, which is the northern segment of the Niushoushan fault, during the Quaternary earthquakes through remote sensing interpretations, field observations and trench investigations, and bracketed the occurrence of Holocene earthquakes according to the analyses of cut-off relationship and age dating. We concluded that, the fault was dominated by NE-directed thrusting during Pliocene to late Pleistocene, followed by sinistrallateral torsional movement during late Pleistocene to pre-Holocene, which presented as positive flower structure, and normal faulting during Holocene. And the paleo-earthquake occurred after 1690±30 BP (Cal AD 320~415). The Liumugao fault might be the seismogenic fault of the M_w 6.5 south Qingtongxia earthquake in A.D. 876.The kinematic characteristic of Liumugao fault during Pliocene to late Pleistocene is consistent with the Guyuan, Eastern Luoshan and Niushoushan faults, which might result from the ongoing northeastward movement of the Tibetan Plateau. The Holocene normal faulting might be controlled by the extension of Yinchuan graben.
- sinistrallateral torsional movement /
- normal faulting /
- Quaternary /
- Liumugao fault /
- northeastern Tibetan Plateau

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References

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