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DIVISION AND MOTION OF LATE QUATERNARY ACTIVE BLOCKS AROUND THE NORTHEASTERN MARGIN OF THE TIBET PLATEAU

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Scientia Geologica Sinica 2001年第2期 101-116页

作者： Guo Shunmin institute of geology, china seismological Bureau, beijing 100029.Jiang Zaisen Second Crustal Deformation Monitoring Center, china seismological Bureau, Xi’an 710054 Zhang Chongli institute of geology, china seismological Bureau, beijing 10002

This study aims to serve earthquake prediction. Six division principles are introduced. Practical materials as division bases are briefly described. The study area is divided into 7 first-order blocks and 33 second-order blocks. Most of these blocks show obvious compression, squeezing and rotation. Especially the motions of blocks related to the Aljin fault, the Qilian Mts east marginal fault and the Xiang Mts-Tianjing Mts-Liupan Mts east marginal fault are discussed in detail. Crustal thickness, gravity and magnetic anomalies as well as the distribution of active faults and strong earthquake epicenters provide strong supports for block division.

关键词： DIVISION AND MOTION OF LATE QUATERNARY ACTIVE BLOCKS AROUND THE NORTHEASTERN MARGIN OF THE TIBET PLATEAU Lake NEE than III

STRUCTURAL CHARACTERISTICS OF THE TAIHANGSHAN PIEDMONT FAULT ZONE

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Scientia Geologica Sinica 2001年第1期 51-69页

作者： Xu Jie, Gao Zhanwu, Song Changqing, and Sun Jianbao institute of geology, china seismological Bureau, beijing 100029

The Taihangshan piedmont fault zone was studied from geological and geophysical data obtained in recent years, and some new recognition was got. The fault zone initiated in the Mesozoic time and mainly formed in Eogene. It consists of a series of left-lateral arranged faults striking NE-NNE. The structure and movement of the fault zone show a clear segmentation. The north-central segment of it is a large-scale detachment fault comprising the Baoding-Shijiazhuang fault and other faults. This segment extends horizontally about 70 km, with a horizontal extensional separation of about 17km and a vertical offset of 5,000-7,000m since Eogene. The fault zone was developed largely in the upper crust, so it does not be a deep-seated fault. Its Quaternary movement was not strong and has not direct genetic relation with seismic activity. But its southern and northern segments intersect with other seismotectonic zones of different directions, and have significance in study of regional seismotectonics and earthquake prediction.

关键词： STRUCTURAL CHARACTERISTICS OF THE TAIHANGSHAN PIEDMONT FAULT ZONE NNE

Earthquake-Affected Time-Space Domain, Recurrence Interval and Effective Preparation Time of Earthquakes

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Earthquake Research in china 2002年第4期16卷 380-395页

作者： Wang Shengzu and Zhang Zongchuninstitute of geology & Laboratory of Tectonophysics, china seismological Bureau, beijing 100029. china institute of geology & Laboratory of Tectonophysics China Seismological Bureau Beijing 100029 China

The study shows that earthquake-affected time-space domain (ETSD), i.e. a time-space range in which strong earthquakes are unable to occur owing to the influence of a prior earthquake occurring, shows a hyperbolic margin curve in the t(time)-r(distance) coordinate plane, which has a maximum affected radius r 0 at t=0 and a maximum influence time t 0 (i.e. the in-situ recurrence interval of earthquakes) at r=0. Based on the time-distance distributions of posterior earthquakes relative to prior ones in the regions of North china, Northwest china, Qinghai-Xizang (Tibet) plateau and Southwest china, the optimized and 90%-confidence margin curves are estimated using optimization and statistical analysis methods. This indicates that the concept and method of ETSD with 3-dimension (time-distance-magnitudes) instead of those of “recurrence interval" with 1-dimension (time) or 2-dimension (time-magnitude) provides a new approach to understanding the fluctuation of seismic activities, estimating the effective earthquake-preparation time of potential hypocenters, and therefore improving the medium- and long-term prediction of strong earthquakes.

关键词： Earthquake-affected time-space domain Recurrence interval Affected radius Effective earthquake-preparation time

Detailed Study of Holocene Paleoearthquakes of the Active Haiyuan Fault

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Continental Dynamics 2001年第2期6卷 59-66页

作者： MIN Wei, ZHANG Peizhen, DENG Qidong and MAO Fengying institute of geology, china seismological Bureau, beijing, 100029 institute of geology China Seismological Bureau Beijing 100029

Through studying eighteen trenches along the Haiyuan fault, ten paleoearthquakes since ten thousand years ago were determined. The paleoearthquakes have different rupture scales. The first and the last events were the rupturing along the entire fault, while the rest of them along the secondary segments of the fault. Temporally, the paleoearthquakes distributions are not uniform so that they are characterized by clustering and having back and forth spatially from the west to middle -east segment of the fault. The magnitude of earthquakes along the entire ruptured fault is about 8.5 and of those along the secondary ruptured segments is about 7.5.

关键词： trench paleoearthquake cluster Haiyuan

Digital image analysis of palaeoenvironmental records and applications

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Chinese Science Bulletin 2002年第23期47卷 1957-1963,2025-2026页

作者： SUN Donghuai1,2, LIU Yu2 & TAN Ming31. South china Sea institute of Oceanology, Chinese Academy of Sciences. Guangzhou 510301, china 2. state Key Laboratory of Loess and Quaternary geology, Earth Environmental institute, Chinese Academy of Sciences, Xi’an 710075, china 3. institute of geology and Geophysics, Chinese Academy of Sciences, beijing 100029. china South china Sea institute of Oceanology Chinese Academy of Sciences Guangzhou China state Key Laboratory of Loess and Quaternary geology Earth Environmental Institute Chinese Academy of Sciences Xi’an China institute of geology and Geophysics Chinese Academy of Sciences Beijing China

Environmental change signals in geological or biological records are commonly reflected on their reflecting or transmitting images. These environmental signals can be extracted through digital image analysis. The analysis principle involves section line selection, color value reading and calculating environmental proxy index along the section lines, layer identification, auto-chronology and investigation of structure evolution of growth bands. On detailed illustrations of the image technique, this note provides image analyzing procedures of coral, tree-ring and stalagmite records. The environmental implications of the proxy index from image analysis are accordingly given through application demonstration of the image technique.

关键词： digital image environmental records.

Analysis of Tectonic Conditions for Strong Earthquakes and Prediction of Seismic Risk of Seismogenic Fault Zones in the Northern Part of North china

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Earthquake Research in china 1998年第1期12卷 77-86页

作者： Yang Zhu’en,Wang Liangmou,and Han Zhujuninstitute of geology,state seismological Bureau,beijing 100029.{6.

The tectonic conditions for strong earthquakes are complicated in various *** genetic conditions for strong earthquakes were studied from the angle of various *** 20 conditions belonging to different fields have been described by *** this paper,the authors try to study and evaluate all the tectonic condition factors for strong earthquakes by the methods of fuzzy mathematics and hierarchical *** the northern part of North china as an example,the authors make a comprehensive digital analysis of all the quantitative and semi-quantitative tectonic *** credibility values of all strong earthquakes with different magnitudes are given after statistical analysis and ***-one fault zones in the study region are quantitatively analyzed,and the potential seismogenic fault zones,maximum magnitude,and risk of earthquake occurrence in the near future are *** result of synthetic evaluation,based on all tectonic conditions of different

关键词： tectonic conditions strong earthquakes seismic risk assessment North china.

Slope Reinforcement for Housing in Three Gorges Reservoir Area

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Journal of Mountain Science 2011年第2期8卷 314-320页

作者： WU Faquan LUO Yuanhua CHANG Zhonghua institute of geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Office of Three Gorges Project Construction Committee the State Council of China Beijing 100038 China

The Three Gorges Project of the Yangtze River is the largest hydropower-complex project under construction in the world. Under the largescale relocation projects, 2874 engineered slopes are formed along with the construction of new towns. In this paper, the cutting slopes are mainly soil slopes and rock slopes. Soil slopes include residual soil slopes, colluvial accumulation slopes, swelling soil slopes, and artificial earth fill slopes, etc. Rock slopes include blocky structure rock slopes, layer structure rock slopes, and clastic structure rock slopes, etc. Varied protection measures have been used for slope protection in the reservoir area including shotcrete concrete-anchor bars, frame beams, retaining walls, slope stabilizing piles, sheet-pile walls, anchorage anti-shear tunnels, flexible protection grids, and drainage, etc. Besides, slope deformation monitoring systems have been set up to monitor deformation failure and the stability state of slopes. The protection measures have guaranteed slope safety and maintained a harmony with the urban environment and surrounding landscape.

关键词： Slope reinforcement Housing for resettlement Three Gorges Reservoir

Delineation of Potential Seismic Source Regions of Moderately Strong Earthquakes Without Seismogenic Tectonics

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Earthquake Research in china 1998年第2期12卷 78-84页

作者： Hu Yinlei and Zhang YumingDepartment of Civil and Structural Engineering, The University of Hong Kong, Hong Kong institute of geology, state seismological Bureau, beijing, 100029. {6.

In this paper,approaches are developed to delineate the potential seismic source regions of moderately strong earthquakes that do not have clear seismotectonic *** on comprehensive analysis of regional tectonic backgrounds and seismicity,the data,such as isoseisrnals,spatial distribution of after shocks,regional tectonic stress field,and focal mechanisms,are employed for the delineation of the potential seismic source *** reliability of such potential seismic source regions is also discussed.

关键词： Moderately strong earthquakes without seismogenic tectonics Potential seismic source.

Estimation of Potential Risk of Reservoir-Induced Earthquake for the Proposed Hydroelectric Project on the Yangtze Gorges

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Earthquake Research in china 1995年第4期9卷 42-51页

作者： Hu Yuliang,Zhao Meng,Hu Ping,Ma Wentao,Yang Qingyuan,and Chen Xiancheng institute of geology,state seismological Bureau,beijing 100029.{6.

The proposed hydroelectric project on the Yangtze Gorges will be one of the largest power stations in the *** problem of induced seismicity to the project has attracted much attention throughout china and the world.A research program has been carried out by the state seismological Bureau of *** on the size of the reservoir and the lithology,geological structure,permeability,stress state,and previous seismicity in the region,the potential risk of reservoir-induced seismicity has been *** results suggest that,after impoundment in the reservoir area,the possibility of induced seismicity cannot be completely ruled *** areas with potential risk may be in some gorges composed of karstified carbonate and plutonic granite around the dam ***,the magnitude is expected to be limited owing to the small dimension of the induced seismogenic faults.

关键词： seismic risk evaluation reservoir earthquake Yangtze Gorge project