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《Chinese Journal of Geophysics》 2015-02
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The Late Quaternary activity characteristics of the Lixian-Luojiabu fault:A discussion on the seismogenic mechanism of the Lixian M8 earthquake in 1654

YANG Xiao-Ping;FENG Xi-Jie;HUANG Xiong-Nan;SONG Fang-Min;LI Gao-Yang;CHEN Xian-Cheng;ZHANG Ling;HUANG Wei-Liang;Key Laboratory of Active Tectonics and Volcano,Institute of Geology,China Earthquake Administration;Shanxi Earthquake Administration;  
We have studied the earthquake occurred in vicinity of Luojiabu,southwest of Tianshui city,Gansu Province,where the M =8 Lixian earthquake occurred on July 21,1654.In geotectonic setting,this earthquake happened in the middle-northern segment of South-North Seismic Belt,which generates numerous strong earthquakes and consequently makes this area one of the most seismically hazardous regions in China.However,causative structure and mechanism of Lixian earthquake is still in debate.Combined with active fault mapping,deep geophysicaldata,globe position system vector field and the distribution of landslides along the fault,we discuss that the mechanism of Lixian earthquake and try to estimate the seismically hazardous in this region.Fault descriptions are based on field observations aided by satellite image from Google earth collected along the fault zone.Our primary purpose is to document features bearing on the recency and kinematics of Quaternary movement along the fault.The observations are largely synthesized on a set of maps.The maps show active fault traces and are annotated to indicate the location of features indicative of the sense,style and amount of offset of geomorphic features.We also map the distribution of Quaternary deposits in the vicinity of fault.Combined with the electrical structure profile derived by 2D inversion of the MT data,we analyzed seismogenic structures of Lixian 1654 earthquake.On July 21,1654,the Lixian M=8earthquake occurred at the east part of Lixian County,Gansu Province,China,in the middle-northern segment of the South-North Seismic Belt.In this region the tectonic activities and deformation are closely related to the north-eastward growth of Tibetan Plateau.Their complicated structural geometries were controlled by the Eastern Kunlun fault,Northern Marginal fault of West-Qinling,and a series of north-east trending faults.The Lixian-Luojiabu fault is a northeast trending sinistral strike-slip active fault and is 150 km long consisted by three sub-segments aligned in right-step-echelon.The fault cuts the T1 terrace(lowest terrace in this area)deposits which contain the red ceramic fragments marking the Yangshao layer.On the terrace surface,the height of fault scarp is about 1.5 m.Along the Lixian-Luojiabu fault,the sinistral displacement of gullies about 3~10mand the height of fault scarps about 4.5~8 mare found in a number of locations.And the Knickpoints about 3.5~3.9mhigh are found 16 maway from the fault scarps.According to knickpoint recession rates at the same environment,these knickpoints may be formed as a 1654 earthquake in Lixian.A large number of landslides are distributed in a belt along Lixian-Yanguan-Luojiabu-Tianshui towns line,and its major axis direction is consistent with the trending of the Lixian-Luojiabu fault.Rear walls and side walls of the landslides are steep,with the outcrops of Late Quaternary loess and little vegetation cover.The Lixian-Luojiabu active fault is the seismogenic fault of the Lixian M=8earthquake in 1654.The south-eastward sliding of the Lixian Sub-block,which is surrounded by the Northern Marginal fault of West-Qinling,Lixian-Luojiabu fault,and the Minxian-Dangchang fault,led to the occurring of the Lixian M=8earthquake in 1654.Differences in electrical structure for the crust on the two sides of Lixian—Luojiabu fault reveals the structural condition for strong earthquake generation.Lixian-Luojiabu fault is a sinistral strike-slip active fault,which generated M=8Lixian earthquake on July 21,1654.This earthquake produced 7~10mhorizontal offset and with 3~4mfault scarps along the Lixian-Luojiabu fault.Tectonically,it took place on the middle-northern segment of the South-North Seismic Belt where a series of M 5had already occurred.Based on analysis of activity of other faults,GPS vector field and deep structural condition,the Lixian-Luojiabu fault activities and deformation are closely related to the northeastward growth of Tibetan Plateau.
【Fund】: 编制活动断层探察相关标准的研究(201308001)和特大地震危险区评估及灾情快速获取关键技术研发(2012BAK15B01-02)共同资助
【CateGory Index】: P315.2
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