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National 2000' GPS control network of China

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Progress in Natural Science:Materials International 2007年第8期17卷 983-987页

作者： Yang Yuanxi~(1**) Tang Yingzhe~1 Chen Chuanlu~2 Wang Min~3.Zhang Peng~4 Wang Xiaorui~2 Song Lijie~5 Zhang Zusheng~6 (1.Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China 2.Geodetic Data Processing center,Xi'an 710054,China 3.center of Earthquake analysis and {3.,China seismological bureau,Beijing 10003.,China 4.National Geomatics center of China,Beijing 100044,China 5.Institute of Surveying and Mapping,Zhengzhou University of Information Engineering,Zhengzhou 450052,China 6.First Crustal Deformation Monitoring center,China seismological bureau,Tianjin 3.0180,China) Xi'an Research Institute of Surveying and Mapping Xi'an 710054 China Geodetic Data Processing center Xi'an 710054 China center of Earthquake analysis and prediction China Seismological Bureau Beijing 100036 China National Geomatics center of China Beijing 100044 China Institute of Surveying and Mapping Zhengzhou University of Information Engineering Zhengzhou 450052 China First Crustal Deformation Monitoring center China Seismological Bureau Tianjin 300180 China

An accurately unified national GPS network with more than 2500 stations,named"National 2000' GPS Control Net- work",signed the epoch 2000.0,has been established by integrating the existing six nationwide GPS networks of China set up by differ- ent departments with different *** paper presents the characteristics of the existing GPS networks,summarizes the strategies in the integrated adjustment of the GPS network,including functional model,stochastic model as well as the adjustment principle modifi- *** modifying the adjustment strategies according to the characteristics of the existing GPS networks and under the support of the IGS stations,the accuracy of the integrated national GPS network is greatly *** datum differences among the sub networks disappear,the systematic error influences are weakened,and the effects of the outliers on the estimated coordinates and their variances are *** is shown that the average standard deviation for the horizontal component is smaller than 1.0 cm,the vertical component is smaller than 2.0 cm,and the three-dimensional (3.D) position of geocenter coordinates is smaller than 3.0 *** exterior checking ac- curacy for the 3.D position is averagely better than 1.0 cm.

关键词： GPS control network adjustment systematic errors robust estimation variance component estimation coordinate system

SOME APPLICATIONS OF FLUID-GEOCHEMICAL METHODS TO STUDYING TECTONIC ACTIVITIES AND PRECURSORS OF EARTHQUAKES

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地震研究 1983年第3期 403-414页

作者： Shi Huixin (center for analysis and prediction,State seismological bureau)

Underground fluids at the depth of tectonic activities may gush out in period of activities. Sinec the composition, temperature and pressure in various spheres(spongy, sedimental, granite, basalt layers, asthenosphere) of tectonosphere are different, the composition and state of fluids contained in these spheres are different too. For example, in mantle strong reductive circumstance dominants

关键词： SOME APPLICATIONS OF FLUID-GEOCHEMICAL METHODS TO STUDYING TECTONIC ACTIVITIES AND PRECURSORS OF EARTHQUAKES rock deep

DROUGHT-EARTHQUAKE RELATION AND MEDIUM-RANGE prediction OF GREAT EARTHQUAKES

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Science in China,Ser.B 1985年第3期28卷 323-336页

作者：耿庆国 Centre of analysis and prediction State seismological bureau Beijing

In order to approach the medium-range prediction of great earthquakes with Ms≥6, the author investigated the relation between drought and earthquakes and believed that the drought-earthquake relation is an effective method for the medinm-range prediction of great *** the author studied the meteorological effects on the earthquake preparation, he found that the epiecntral regions of great earthquakes with M≥6 are usually dry for one to three and a half years before earthquakes. The draught area changes with the earthquake magnitude proportionally. If an earthquake occurs in the 3.d year of drought, its magnitude is 0.5 higher than that in the 1st year of the *** to the above-mentioned facts, the author puts forth the medium-range prediction method and principle of great earthquakes by the drought-earthquake relation: (ⅰ) the magnitude is defined in accordnce with the area of the drought regious; (ⅱ) the possible risk area is defined on the basis of the location of the droug

关键词： DROUGHT-EARTHQUAKE RELATION AND MEDIUM-RANGE prediction OF GREAT EARTHQUAKES

Contemporary crustal movement of continental China obtained by global positioning system(GPS) measurements

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Chinese Science Bulletin 2001年第18期46卷 1552-1554,1588页

作者： MA Zongjin, CHEN Xinlian, YE Shuhua, LAI Xian, WEI Ziqing, CHEN Junrong, NING Jinsheng, XU Huoze & DING Guoyu1. Insitute of Geology, China seismological bureau, Beijing 100029, China (e-mail: disgroup@***)2. center for analysis and prediction, China seismological bureau, Beijing 10003., China 3. Shanghai Astronomic Observatory, Chinese Academy of Sciences, Shanghai 20003., China 4. Institute of Seismology, China seismological bureau, Wuhan 43.077, China 5. Institute of Survey and Mapping, Xi’an 710054, China 6. National bureau of Survey and Mapping, Beijing 10083., China 7. Wuhan University, Wuhan 43.077, China 8. Institute of Geodesy and Geophysics, Wuhan 43.077, China 9. China seismological bureau, Beijing 10003., China Insitute of Geology China Seismological Bureau Beijing China center for analysis and prediction China Seismological Bureau Beijing China Shanghai Astronomic Observatory Chinese Academy of Sciences Shanghai China Institute of Seismology China Seismological Bureau Wuhan China Institute of Survey and Mapping Xi’an China National bureau of Survey and Mapping Beijing China Wuhan University Wuhan China Institute of Geodesy and Geophysics Wuhan China China seismological bureau Beijing China

We obtain a unified horizontal velocity field of continental China and vicinity through measurements at 81 GPS stations provided by the National Key Infrastructure Project, Crustal Movement Observation Network of China. The velocity field delineates patterns of movements and deformation of active crustal blocks in continental China under the Eurasia-fixed reference frame. The space-based geodesy also clearly shows for the first time the horizontal movementand deformation of continental China induced by indentation of the Indian plate. The data provide kinematic constraints for simulating dynamic process of continental litho-spheric deformation.

关键词： crustal movement velocity field tectonic deformation.

THE SELF-RHYTHM PHENOMENA IN EARTHQUAKE ACTIVITY

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Science China Chemistry 1989年第6期32卷 749-756页

作者：刘德富黎令仪 center for analysis and prediction State Seismological Bureau Beijing

The structure of earthquake series on the Chinese mainland and in the main seismic provinces has a very good rhythm of nature. Strong earthquakes take 8 times of passing hrough the mid-strong earthquake as a section and occur on section points in this way (or multiple 8). The rhythmic activities of strong earthquakes indifferent provinces are both similar and independent, and are not related to the time of occurrence. These phenomena indicate that the earthquake activities are a regular behaviour of self-organization with self-rhythm.

关键词： earthquake self-rhythm.

Earthquake damage and loss estimation with Geographic Information System

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 95-102页

作者： YONG CHEN GE PING LI QI FU CHEN LING CHEN MIN FENG LI center for analysis and prediction, China seismological bureau, Beijing {3., China 1. center for analysis and prediction China Seismological Bureau 100036 Beijing China

The present paper first includes a brief discussion of GIS technology. Next, the various steps in a regional earthquake damage and loss analysis are discussed, with emphasis on their implementation in the GIS environment. Lastly, a software of WorldRisk which was completed recently are presented to illustrate GIS based global earthquake damage and loss estimation.

关键词： GIS earthquake damage loss estimation

On the Large Scale Spatial Heterogeneity of Great Shallow Earthquakes and Plate Coupling Mechanism in Chinese Mainland and Its Adjacent Areas

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Earthquake Research in China 1997年第3期11卷 7-15页

作者： Fu Zhengxiang and Jiang Lixincenter for analysis and prediction,State seismological bureau,Beijing {3.,China

Research on the large scale spatial heterogeneity of great intraplate shallow earthquakes on the Chinese mainland and adjacent areas discussed in this paper shows that(1)there are four main high seismicity areas:the North China seismic area in the eastern part of China(3.°-42°N),the Southeastern Coast seismic area in the eastern part of China(19°-25°N),the North-South seismic area in the western part of China and its adjacent areas(Burma-China-Mongolia),and the Central Asian seismic area in the western part of China and its adjacent areas(Pamir-Tianshan Mountains-Baikal);(2)the four intraplate seismic areas that are approximately perpendicular to those sections of the Eurasia plate boundary that surrounds the Chinese mainland and its adjacent areas,where the Eurasia plate has a strong seismic coupling with the North America-Pacific Ocean-Philippine Sea plate and the India plate; and(3.the large scale spatial heterogeneity of intraplate seismicity in China and its adjacent areas that might be

关键词： Heterogeneous seismicity Coupling mechanism Chinese mainland

Pull-apart Basins and the Total Lateral Displacement Along the Haiyuan Fault Zone in Cenozoic

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Earthquake Research in China 2001年第4期15卷 390-398页

作者： Tian Qinjian, Ding Guoyu, and Shen Xuhuicenter for analysis and prediction, China seismological bureau, Beijing {3., China center for analysis and prediction China Seismological Bureau Beijing 100036 China

Pull-apart basins of three scales were found along the Haiyuan fault zone. The largest one is more than 50km long, named Laolongwan basin developed in Miocene. A model was built to calculate the amount of pull-apart of an extensional basin. Parameters used in calculation include thickness and length of deposition and depth of detachment. The results of calculation show that the amount of pull-apart of the Laolongwan Basin is about 3. km. Based on previous studies and calculating by using the average slip rate method, amount of pull-apart of the other two smaller basins are 22 km and 8 km, respectively. Thus, the total displacement of strike-slip along the Haiyuan fault zone is about 60 km, which is close to the offset of the Yellow River from Jingtai to Jingyuan.

关键词： Lateral displacement Pull-apart basin Haiyuan fault zone

Advances on Active Tectonics Research

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Earthquake Research in China 2001年第4期15卷 346-353页

作者： Chen Yong, Chen Qifu, and Li Juancenter for analysis and prediction, China seismological bureau, Beijing {3., China center for analysis and prediction China Seismological Bureau Beijing 100036 China

The tectonic movement at human scale has not been fully understood yet, especially for active tectonics, although it is the basis to study natural hazards and environmental variations. Many national and international scientific plans related closely to active tectonics research have been made in the past ten years. This paper briefly summarized the background of the undertaking of active tectonics research, its advances and existing problems, and the key points in its future studies are also pointed out. The emerging of new technologies like the Earth Observing System, Digital Seismology and so on provides unusual opportunities for tectonic research. It is emphasized, however, that careful analyses and building up of new theoretical frame are sill the key problems for studies of active tectonics, especially for active tectonics in China’s continent.

关键词： Active tectonics