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National 2000' GPS control network of china

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 prediction,china seismological bureau,beijing 100036,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 300180,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

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Heart failure in china:epidemiology and current management

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Journal of Geriatric Cardiology 2024年第6期21卷 631-641页

作者： Sheng-Shou HU the Writing Committee of the Report on Cardiovascular Health and Diseases in china Fuwai Hospital National Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

The Annual Report on Cardiovascular Health and Diseases in china(2022)intricate landscape of cardiovascularhealth in *** connection with the previous section,this sixth section of the report offers a comprehensive analysis of heart failure(HF)in *** is one of the most important cardiovascular disease in the 21st *** mortality is equivalent to that of *** is an important public health problem that seriously affects the health of Chinese *** recent years,with the deepeningof understanding,the change of treatment principles,the innovation of treatment methods and the update of treatment guidelines,the in-hospital mortality of HF patients has declined,and the long-term prognosis is also ***,there are stilldifferences in the management level of HF among different hospitals in *** to improve the standardized diagnosis andtreatment level of HF in china remains an important challenge.

关键词： epidemiology diagnosis treatment

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Pulmonary embolism and deep venous thrombosis in china

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Journal of Geriatric Cardiology 2024年第8期21卷 775-778页

The Annual Report on Cardiovascular Health and Diseases in china(2022) intricate landscape of cardiovascular health in *** connection with the previous section,this eighth section of the report offers a comprehensive analysis of pulmonary embolism and deep venous *** recent years,research in the field of pulmonary vessel in china has made great progress.A number of nationwide multi-center registry research results have filled the gaps in the epidemiology,diagnosis and treatment of pulmonary hypertension and venous *** types of pulmonary hypertension still need attention to the identification of risk factors and/or risk stratification,and venous thromboembolism needs attention in the prevention and the overall management inside and outside *** the future,we look forward to the publication of more high-quality research in china,which could be able to improve relevant guidelines for pulmonary vascular diseases both domestically and inter-nationally.

关键词： epidemiology prevention diagnosis

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Tectonomechanical analysis of Listric Faults

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Acta Geologica Sinica(English Edition) 1988年第2期1卷 127-140页

作者： Chen Qiang center for analysis and prediction, State seismological bureau, beijing center for analysis and prediction State Seismological Bureau Beijing

Listric faults of different levels and scales are widely developed in the lithosphere. According to theirtectonomechanical geneses. the author divides listric faults into primary and secondary ones. and the formermay be subdivided into gravity-gliding listric faults, regional extensional listric normal faults. regionalcontractional reverse listric faults and deep-seated ductile listric faults, By means of the slip-line field theorydealing with Mohr’s criterion expressed by quadratic limiting curves. the author has preliminarily determinedthe occurrences. patterns and mechanical properties of various types of listric faults during their formation. andhas analyzed their tectonic evolution and related dynamic processes in the lithosphere.

关键词： Tectonomechanical analysis of Listric Faults

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Moment tensor analysis of the acoustic emission source in the rock damage process

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Progress in Natural Science:Materials International 2005年第7期15卷 609-613页

作者： YU Huaizhong, ZHU Qingyong, YIN Xiangchu and WANG Yucang ( State Key Laboratory of earthquake Dynamics, Institute of Geology, china earthquake Administration, beijing 100029, china State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, beijing 100080, china School of Mathematics and Computational Science, Zhongshan University, Guangzhou 510275, china center for analysis and prediction, china seismological bureau, beijing 100036, china Quakes, Department of Earth Science, University of Queensland, Brishbane, Austrialia) State Key Laboratory of earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China School of Mathematics and Computational Science Zhongshan University Guangzhou 510275 China center for analysis and prediction China Seismological Bureau Beijing 100036 China Quakes Department of Earth Science University of Queensland Brishbane Australia

To further investigate the mechanism of acoustic emission (AE) in the rock fracture experiment, moment tensor analysis was carried out. The AE sources characterized by crack sizes, orientations and fracture modes, are represented by a time-dependent moment tensor. Since the waveforms recorded by AE monitors correlate to the moment tensors, we prefer to select the P wave amplitude from the full-space Green's function of homogeneous and isotropic materials to determine the six independent components of the moment tensor. The moment tensor analysis was used to investigate the AE sources recorded in the experiment, and three types of micro-cracks were found, which are tensile mode, shear mode and mixture of the tensile and shear mode. In addition, the motion of micro-cracks was decided by eigenvectors of moment tensor. Results indicate that the moment tensor analysis may be used as a measurement to reflect the damage evolution of rock specimen.

关键词： moment tensor acoustic emission rock fracture.

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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 100036, 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

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DISPLACEMENT TIME SERIS AT FIDUCIAL STATIONS OBTAINED FROM GPS OBSERVATIONS IN CRUSTAL MOVEMENT OBSEREVATION NETWORK OF china

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大地测量与地球动力学 2003年第B12期23卷 54-61页

作者： Gu Guohua and Zhang Jing (center for analysis and prediction, CEA,beijing 100036,china) center for analysis and prediction CEABeijing 100036China

A preliminary analysis of the time series of displacements at fiducial stations obtained from continuous GPS observations during the period of Sept. 1998 to Oct. 2001 in the Crustal Movement Observation Network of china (CMONOC) is made. The selection of datum for producing displacement time series suitable for earthquake prediction is discussed. Time series of horizontal crustal displacements are obtained by using a datum of a stable group of 9 stations with very small relative horizontal displacements in eastern china as reference. Time series of vertical crustal displacements are obtained by using a stable group of 7 stations scattered in different regions with relatively small relative vertical displacements as reference. During the period of 2000 to 2001, anomalous horizontal and vertical displacements occurred twice at the fiducial stations in western china. These anomalies may be related to seismic activities of magnitudes about 6 in the Yunnan region on the North South seismic belt.

关键词：地壳运动 GPS观测与数据处理基准站位移时间序列分析位移结果

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Deformation in the Three Gorges Reservoir after the first impoundment determined by GPS measurements

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Progress in Natural Science:Materials International 2005年第6期15卷 515-522页

作者： DU Ruilin 1,2 , QIAO Xuejun 1,2 *, WANG Qi 1,2 , XING Canfei 1,2 and YOU Xinzhao 1,3 (1. Institute of Seismology, CEA, Wuhan 430071, china 2. Laboratory of Crustal Movement and Earth Observation, Wuhan 430071, china 3. center for analysis and prediction, CEA, beijing 100036, china) Institute of Seismology CEA Wuhan 430071 China Laboratory of Crustal Movement and Earth Observation Wuhan 430071 China center for analysis and prediction CEA Beijing 100036 China

A 6-year long GPS observation (1998—2003) indicates that crustal deformation in the Three Gorges area is less active at a marginally measurable rate of 0—5 mm/a relative to stable South china block. However, the impounding water in June 2003 has induced transient displacement at the Three Gorges dam and the emerging reservoir. GPS measurements after the first stage of water filling of the reservoir demonstrate that vertical subsidence close by Yangtze River is about 10—40 mm, and the horizontal displacement is less than 5—10 mm. The maximum subsidence induced by the impoundment is located in the segment of the reservoir from Maoping to Xiangxi. The water loading-induced deformation diminishes rapidly with the distance from banks of the reservoir. The overall pattern of transient deformation is consistent with the simulation result of Farrell, and is attributed to the elastic response of upper lithosphere crust to overlying water reservoir.

关键词： Three Gorges GPS impoundment deformation.

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Research on Algorithm M8 Applying to TIP prediction of china's Strong earthquake Cases in the Past Decades

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earthquake Research in china 1994年第4期8卷 4-10页

作者： Huang Deyu and Chen Yongcenter for analysis and prediction,SSB,beijing 100036,china State seismological bureau,beijing 100036,china

This paper offers a positive research result of TIP before 16 strong earthquakes in North and Southwest china and their nearby areas since 1979 by using improved algorithm *** result showed that 14 of them were determined to occur within the times of increased *** precaution occupies about 37% of the total space-time *** means we have made quite good results of intermediate-term prediction of strong *** the method could be used as one of the useful means of the intermediate-term prediction of strong earthquakes.

关键词： M8 algorithm Intermediate-term earthquake prediction

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Joint exploration of crustal structure in Fuzhou basin and its vicinities by deep seismic reflection and high-resolution refraction as well as wide-angle reflection/refraction

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Science china Earth Sciences 2005年第7期48卷 925-938页

作者： ZHU Jinfang1, XU Xiwei2, ZHANG Xiankang3, HUANG Zonglin1, CHEN Xiangxiong1, FANG Shengming3, LIU Baojin3, ZHENG Rongzhang2,4 1. seismological bureau of Fujian Province,Fuzhou 350003,china 2. Institute of Geology,china earthquake Administration,beijing 100029,china 3. Research center for Exploration Geophysics,china earthquake Administration,Zhengzhou 450002,china 4. State Key Laboratory of earthquake Dynamics,Institute of Geology,china earthquake Administration,beijing 100029,china seismological bureau of Fujian Province Fuzhou 350003 China Institute of Geology China Earthquake Administration Beijing 100029 China Research center for Exploration Geophysics China Earthquake Administration Zhengzhou 450002 China State Key Laboratory of earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China

The Fuzhou basin and its vicinities are located at the northern end of the southeastern coastal seismic zone of the mainland of china. By the joint explorations of high-resolution seismic refraction and wide-angle reflection/refraction as well as deep seismic reflection in the region, which is the first synthetic profile in china, its fine velocity structure and geometric structure from the ground to Moho discontinuity is obtained. The result shows that the crust is obviously layered with a thickness of about 32 km. Basically, it consists of two parts: upper crust and lower crust. The velocity of the upper crust is 5.9-6.2 km/s in which there is a 3-4-km-thick weak low-velocity layer between the depths of 10-15 km, while the velocity of the lower crust in the range of 6.3-7.2 km/s. There exists a strong velocity gradient layer about 3 km thick above the Moho discontinuity whose velocity increases from 6.5 to 7.27 km/s. There exist high-angle normal faults that are small in size and extend only in the shallow crust. These faults are the secondary developed on the hanging wall of westward dipping low-angle normal faults. Thus, their seismogenic ability is limited, however, there exists a high-angle deep fault in the crust from Changle-Zaoan fault zone to seashore fault zone. This deep fault has cut the interface between the upper and lower crusts and Moho discontinuity, and may be the deep structure to trigger destructive earthquake source in future to affect Fuzhou City. These results have advanced the detecting precision of the deep structure in the southeastern coastal seismic zone of the mainland of china. In the aspect of the combined feature of the deep and shallow extensional structures that consist of the westward dipping low-angle normal faults and secondary normal faults on their hanging walls in the upper crust, it is firstly obtained that a united structural interpretation has deepened the knowledge about the deep dynamic process in the southeastern coasta

关键词： deep seismic reflection high-resolution seismic refraction wide-angle.

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