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Characteristic Analysis of Anomalies of Strong Earthquakes along the tancheng-lujiang fault zone and Both Its Sides

Earthquake Research in China 2015年第4期29卷 498-513页

作者： Li Jianyong Li Jie Zhang Rui Li Yu Han Yufei Wang Tan National Earthquake Infrastructure Service State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences Earthquake Administration of Shandong Province

This article made a systematic statistical analysis on the duration,spatial distribution,form,range,type and reliability of precursory anomalies based on the observations of precursors of 24 moderate-strong earthquakes occurring along the tancheng-lujiang fault zone and its bilateral areas in Shandong,Liaoning,Hebei,Jiangsu and Jiangxi Provinces in the period from 1966 to 2005. Results show that:( 1) For M7. 0 and M6. 0earthquakes,med-term abnormities are the greatest in number,short-term abnormities come second,and imminent anomalies are the least. For M5. 0 earthquakes,short-term abnormities are often the most in number,imminent anomalies come second,and the med-term ones are the least.( 2) Precursory anomalies are periodical,part of the med and short-term anomalies are shown as short-term and imminent anomalies during their development.( 3) The development of precursor shows quasi-synchronism; the closer to earthquake occurrence time,the more turning changes of anomalies will appear.( 4)Anomalies mainly occur within an epicenter distance of 100 km, showing a relative concentrated distribution in space,and the shorter the distance to epicenter,the higher the anomaly station / item rate.( 5) The spatial distribution of anomalies is relatively correlated to the strike of structures,having a good consistency with the structure.( 6)There is no significant correlation between duration of abnormities and the epicenter distance.( 7) The higher the magnitude of the earthquake,the greater the amplitude of the abnormities measured with the same observation approach.( 8) In terms of the itemsof the observations,fluid abnormities are the greatest in number,followed by deformation and electromagnetism observations.( 9) For all observation items,med and short-term abnormities make up the majority and short-term and imminent anomalies the minority.( 10) In fluid,deformation and electromagnetism observations,fairly reliable anomalies are about double the number of reliable anomal

关键词： tancheng-lujiang fault zone Characteristics of precursory anomaly Fluid anomaly Deformation anomaly Electromagnetic anomaly

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Geological Evidence and Characteristics of Activity of the Wuhe-Mingguang Section of tancheng-lujiang fault zone in Late Pleistocene

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Earthquake Research in China 2016年第4期30卷 485-499页

作者： Shu Peng Fang Lianghao Zheng Yingping Lu Shuo Pan Haobo Song Fangmin Li Shengqiang Earthquake Administration of Anhui Province Heifei 230031China Institute of Geology China Earthquake AdministrationBeijing 100029China Earthquake Administration of Hebei Province Shijiazhuang 050021China

As the most influential strike-slip fault in East China,the tancheng-lujiang fault zone draws scholars attention for its strong seismic activity. Nevertheless,most research has been conducted along segments in Shandong Province and Bohai Bay where huge earthquakes occur frequently. Meanwhile,it is generally believed that segments lying to the south of Huaihe River have been inactive since the late Quaternary and thus it is incapable of generating moderate or strong earthquakes. However,these understandings about the tancheng-lujiang fault have been questioned by our recent work for part of the fault south to the Huaihe River. Based on interpretation of high-resolution satellite images,detailed field investigations near Wuhe county and Mingguang City in northern Anhui Province and elaborate microstructure analysis, we come to the conclusion that the tancheng-lujiang fault zone mainly consists of four branches and at least one should be active since the late Pleistocene for the Wuhe-Mingguang section. This segment is monopolized by dextral strike-slip motion in late Quaternary. Different from obvious faults in bed rocks or consolidated sediments,the latest activity trace in Quaternary loose sediment revealed by trench excavation is not obvious or even invisible to visual observation. According to our recent work and previous studies, we call for more attention to be paid to invisible faults in young sediment and also suggest that more research be conducted along this seemingly placid segment.

关键词： tancheng-lujiang fault zone South of Huaihe River Wuhe-Mingguang segment Microstructure Late Pleistocene

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New Evidence of Late Quaternary Activity on the Xinyi-Wuhe Segment of the tancheng-lujiang fault zone

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Earthquake Research in China 2014年第3期28卷 311-319页

作者： Zheng Yingping Yao Daquan Zhang Yi Zhang Weijing Zhai Hongtao Zhao Peng Li Guang Earthquake Administration of Anhui Province National Earthquake Response Support Service CEA

The tancheng-lujiang fault zone has great influence in eastern China. Studies have shown obvious signs of neotectonic activities on the Xinyi-Wuhe segment of the tancheng-lujiang fault zone. In this study,on the basis of the previous work,many seismological surveys are made along the tancheng-lujiang fault zone and trenches are excavated in key *** with the analysis of the seismic activities along the fault,the fault movement features and future seismic risk are discussed. Much first-hand information obtained in the paper can provide an important reference value for the study of large earthquake recurrence rules and the mid and long-term earthquake prediction on the Xinyi-Wuhe segment of the tancheng-lujiang fault zone.

关键词： tancheng-lujiang fault zone Xinyi-Wuhe segment Late Quaternary Evidence of fault activity

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Prehistoric Earthquakes in the Chishan Segment of the tancheng-lujiang fault zone during the Mid-Late Pleistocene

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Earthquake Research in China 2012年第4期26卷 491-498页

作者： Yao Daquan Tang Youbiao Shen Xiaoqi Chen Anguo Zheng Haigang Zhao Peng Xiao Weipeng Li Guang Zheng Yinping Li Lingli Earthquake Administration of Anhui Province

Chishan is located in Sixian County of Anhui Province, and the west branch fault of tancheng-lujiang fault zone passes through here. According to previous research, the Chishan segment of tancheng-lujiang fault zone has been obviously active since the Quaternary. Trenches excavated perpendicular to the Chishan segment for this study have revealed many prehistoric earthquake ruins--the multi-phase reverse faulting colluvial wedge, which is represented as the western brick-red sandstone of the late Cretaceous or maize gravel stratum of the mid Pleistocene of the hanging wall of the fault overlapping eastward the mid-late Pleistocene brown clay. In the base of the wedges, steep NW-dipping faults were found, and the steep fault planes turned upward to gently dipping collapse planes. As revealed by the trenches, the connection line of the breaking points strikes NNE in general. Heaving landforms are preserved at most parts of the tailing edge of the hanging wall where the fault passes through, and some EW-trending gullies were offset by right- lateral faulting. The two walls of several trenches have consistently shown that the collapse of traces have been pushed by a west-to-east force. Among them, Tcl - Tc4 show that the brick red limestone （K2 ） overthrust and collapsed on the yellow-brown clay containing ferro-manganese nodules （ Q2r-3 ） ; Tc5 reveals that the yellowish-white gravel （ Q2r ） and the sandstone （K2 ） and overthrust and collapsed on the aforementioned clay. Reverse faulting colluvial wedges are found on both walls of each of the 8 trenches, but the number of wedges revealed in different trenches is different： there is 1 wedge, and 2 wedges in Tcl and Tc3. 3 wedges in Tc2, Tc4 and Tc5, and in individual trenches, few wedges are revealed. This may be related to the trench＇s location, depth and height of theremaining denudation. From the analysis of the trenches and the thermoluminescence dating results, we can preliminarily conclude that multiple large-

关键词： tancheng-lujiang fault zone Chishan Mid-late Pleistocene Prehistoricearthquake

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Comparison between Paleozoic and CenozoicLithospheric Mantle in Eastern Part of North China Block: With a Discussion of Mantle Evolution

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Journal of Earth Science 1999年第3期18卷 207-214页

作者： Zheng Jianping Lu Fengxiang(Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China)O’Reilly S. Y. Griffin W. L. Zhang Ming(GEMOC, Faculty of Earth Sciences, Macquarie University, Sydney, NSW2113, Australia) Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China GEMOC Faculty of Earth Sciences Macquarie University Sydney NSW2113 Australia

Paleozoic diamond- and xenolith-bearing kimberlites and Cenozoic xenolith-bearing basalts,erupted in the eastern part of the North China block (NCB), provide excellent mantle probes for the research of intra-plate processes and the Phanerozoic evolution of the subcontinental lithosphere mantle (SCLM ). In this study, the mineral inclusions in diamond and xenoliths from Mengyin (Shandong Province) and Fuxian (Liaoning Province) kimberlites were chosen for constraining the nature of the Paleozoic SCLM. while xenoliths from the Shanwang and Qixia basalt (both in Shandong Province) were chosen for constraining the nature of the Cenozoic *** lies astride the tancheng-lujiang (Taulu) fault zone, a major lithospheric fault in Eastern China as well as in Eastern Asia, and Qixia lies east of the rault zone. Based on the research of the petrography of mantle xenoliths, petrochemistry, major and the trace element of mantle minerals, lithospheric thermal state, combiued with tbe modern geophysical data, it is concluded that the attenuation and replacement of Paleozoic SCLM by upwelling asthenospheric materials through thermal erosion and possibly delamination resulted in the rormation of irregular-shaPed hot bodies, mainly along weak zones within the mantle- The Tanlu fault zone played an importont role in the Mesozoic-Cenozoic replacemeni or the pre-existing lithospheric mantle.

关键词： asthenospheric material paleo-lithosphere replacement and attenuation thermal erosion mantle weak zone tancheng-lujiang fault zone Eastern China

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Crustal structure of Bohai Sea and adjacent area(North China) from two onshore-offshore wide-angle seismic survey lines

Crustal structure of Bohai Sea and adjacent area(North China...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Lihua Liu Tianyao Hao Chuanchuan L Qingyu You Jun Pan Fuyun Wang Ya Xu Chunlei Zhao Jianshi Zhang Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences First Institute of Oceanography State Oceanic Administration Geophysical Prospecting Center China Earthquake Administration

In 2010 and 2011 onshore-offshore surveys along two lines in the Bohai area were carried *** paper presents the deep structure from wide-angle seismic data along the two lines,and try to improve the reliability of deep interfaces by using of the CMP prospecting *** result is as follows.(1) The environmental noise of records from OBSs in shallow water area is stronger than that from deep waters.(2)The CMP stacking method is potential for high-density OBS surveys.(3) The thickness of sedimentary layer in Bohai Sea and surrounding area is 3-5 km,the velocity increases with depLh from about 2 km/s at the seafloor to about 4.5 km/s on the sedimentary basement.(4) The upper crust thins toward the sea area from the land area,the middle and lower crust also vary insignificantly;the middle crust is about4 km and the lower crust is about 15 km;the velocities of the middle and lower crust shows gentle variation in vertical but obvious in lateral due to the impact of fault zones.(5) The velocity contours nearby the tancheng-lujiang(TLFZ) and Zhangjiakou-Penglai(ZPFZ) fault zones are U-shaped,where the velocity changes laterally and the interface undulates significantly;velocity disturbances exist in the crustmantle transition zone at the fault zones;the TLFZ and ZPFZ could be the upwelling channels of deep material.(6) In the eastern part of North China Craton(NCC),the Moho gently ranges at the depth of about 30 km with local rises;lithosphere thinning occurred predominantly at the top of upper mantle;the east boundary of lithosphere thinning is inferred to be on the east of Bohai Sea.

关键词： Ocean Bottom Seismometer(OBS) tancheng-lujiang fault zone Zhangjiakou-Penglai fault zone North China Craton(NCC) Wide-angle seismic survey

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