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Longling-Lancang fault zone in southwest Yunnan, China——A newly-generated rupture zone in Continental crust

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Chinese Science Bulletin 2000年第4期45卷 376-379页

作者： QUO Shunmin XIANG Hongfa ZHOU Ruiqi XU Xiwei DONG Xingquan ZHANG Wanxia Institute of Geology China Seismological BureauBeijing 100029China Seismological Bureau of Yunnan Province Kunming 650041China

The Longling-Lancang fault zone, consisting of sets of en echelon or clustered faults, is a newly-generated rupture zone. it is characterized by the distribution of active faults, earthquake faults and earthguakes in zones. Formed in the Early-Middle Pleistocene, stili active in the late, it moves dextrally and extensionally. it tends to cut off the locked segments and discontinuous segments at first, then pervades totally along the zone, accompanied by strong earthguakes.

关键词： southwest Yunnan fault zone newly-generated rupture zone.

newly-generated Seismic Rupture Zone:Identification,Type Division and Seismogeological Significance

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Earthquake Research in China 2000年第1期14卷 66-78页

作者： Xiang Hongfa, Zhang Wanxia, Guo Shunmin and Xu XiweiInstitute of Geology, China Seismological Bureau, Beijing 100029, China Institute of Geology China Seismological Bureau Beijing 100029 China

The results of geological research show that those phenomena such as surface geology,geomorphology,deep geophysical field,and time-space distribution of seismicities can be usedas the main seismogeological indicators to identify the newly-generated seismic rupture zone(NSRZ).According to their formation and evolution process,the NSRZs can be divided intothree types:pre-rupture-isolated,quasi-rupture-discontinuous and *** a pre-rupture-isolated NSRZ,the seismicity is dominated by medium-small *** a quasi-rupture-discontinuous NSRZ,the frequency and intensity of strong earthquakesincrease and there may even be the largest earthquake to occur.A major-rupture-connectedNSRZ is the segment where rupture has entered the mature stage;in such a zone,theintensity and duration of seismic activity depend on the constitutive condition and regionalstress field in the zone.

关键词： newly-generated seismic rupture zone (NSRZ) Identification Type division Seismogeological significance

Preliminary Study on Two newly-generated Seismotectonic Zones in North and Southwest China

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Earthquake Research in China 1996年第4期10卷 78-86页

作者： Xu Jie,Han Zhujun,Wang Chunhua,and Niu LanfangInstitute of Geology State Seismological Bureau,Beijing 100029,China

In previous seismotectonic studies,the emphasis was placed on the inherited active fault *** the recent tectonic stage that essentially keeps in step with the current regional geologic environment and the stress field,however,there are also some newly generated fault *** studying the seismicity in North and Southwest China,it has been known that the NE-trending Tangshan-Hejian-Cixian and NW-trending Tengchong-Gengma-Lancang seismic zones are just two newly generated fault *** distinguished from the inherited fault zones,they are called the newly generated seismotectonic *** paper deals with the existence of these two seismogenic zones from their seismicity and geological structures,gives a preliminary analysis of their characteristics,and shows their significance.

关键词： newly-generated seismotectonic zone North China Southwest China

Discovery of the Longriba Fault Zone in Eastern Bayan Har Block, China and its tectonic implication

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Science China Earth Sciences 2008年第9期51卷 1209-1223页

作者： XU XiWei WEN XueZe CHEN GuiHua YU GuiHua Institute of Geology China Earthquake AdministrationBeijing 100029China Earthquake Administration of Sichuan Province Chengdu 610041China

Re-measured GPS data have recently revealed that a broad NE trending dextral shear zone exists in the eastern Bayan Har block about 200 km northwest of the Longmenshan thrust on the eastern margin of the Qinghai-Tibet Plateau. The strain rate along this shear zone may reach up to 4-6 mm/a. Our interpretation of satellite images and field observations indicate that this dextral shear zone corresponds to a newly generated NE trending Longriba fault zone that has been ignored before. The northeast segment of the Longriba fault zone consists of two subparallel N54°±5°E trending branch faults about 30 km apart, and late Quaternary offset landforms are well developed along the strands of these two branch faults. The northern branch fault, the Longriqu fault, has relatively large reverse component, while the southern branch fault, the Maoergai fault, is a pure right-lateral strike slip fault. According to vector synthesizing principle, the average right-lateral strike slip rate along the Longriba fault zone in the late Quaternary is calculated to be 5.4±2.0 mm/a, the vertical slip rate to be 0.7 mm/a, and the rate of crustal shortening to be 0.55 mm/a. The discovery of the Longriba fault zone may provide a new insight into the tectonics and dynamics of the eastern margin of the Qinghai-Tibet Plateau. Taken the Longriba fault zone as a boundary, the Bayan Har block is divided into two sub-blocks: the Ahba sub-block in the west and the Longmenshan sub-block in the east. The shortening and uplifting of the Longmenshan sub-block as a whole reflects that both the Longmenshan thrust and Longriba fault zone are subordinated to a back propagated nappe tectonic system that was formed during the southeastward motion of the Bayan Har block owing to intense resistance of the South China block. This nappe tectonic system has become a boundary tectonic type of an active block supporting crustal deformation along the eastern margin of the Qinghai-Tibet Plateau from late Cenozoic till now

关键词： Qinghai-Tibet Plateau active block newly-generated fault zone slip rate nappe tectonics