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Co-seismic ground deformation and source parameters of Mani M7.9 earthquake inferred from spaceborne D-InSAR observation data

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Science china Earth Sciences 2004年第6期47卷 481-488页

作者： SHAN Xinjian1,MA Jin1,WANG Changlin2,LIU Jiahang1,SONG Xiaoyu1 & ZHANG Guifang1 1.institute of Geology and Laboratory of Tectonophysics,china seismological bureau,Beijing 100029,china 2.institute of Remote Sensing Application,Chinese Academy of Sciences,Beijing 100101,china 1. institute of Geology and Laboratory of Tectonophysics China Seismological Bureau 100029 Beijing China 2. institute of Remote Sensing Application Chinese Academy of Sciences 100101 Beijing China

We obtain the co-seismic ground deformation field of the Mani M7.9 earthquake on November 8, 1997 through three-pass differential interferometric processing. Then we get the geometric and kinematics parameters of this event by the elastic half-space model and forward modeling with the InSAR data. The following results have been obtained: (i) The deformation fields on both sides of the seismogenic fault are affected by the co-seismic deformation field even in 110 km away from the fault. The loss of phase coherence belt caused by the zone of ground rupture crosses the image from east to west with a length of an area 110 km. (ii) The maximum horizontal displacement caused by the earthquake reaches 7.96 m. (iii) The earthquake fault can be divided into four parts, and the deformation field of the middle two parts is bigger than that of the other two, with lengths of 27 km and 37 km, respectively. And their average sliding values on the rupture surface are 6500 mm and 6000 mm, respectively, and their depths both are 35 km. The segment of 27 km length is the major rupture surface of this earthquake. The west part and the east part of the fault have lengths of 23 km and 26 km, respectively. The sliding value of the west one is 4.00 mm and that of the east one is 5800 mm. They extend to depths of 20 km and 18 km, respectively.

关键词： D-InSAR, surface deformation field in sight direction, Mani earthquake, characteristics of earthquake fault.

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ACCURACY ESTIMATION OF DZR-Ⅱ HIGH PRECISION SLR SYSTEM DEVELOPED BY institute OF seismology

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Chinese Science Bulletin 1988年第12期33卷 1018-1022页

作者：潘明 institute of seismology State Seismological Bureau Wuhan

Crustal deformation and continental plate motion are investigated by high accu- rate measurement of distance to the LAGEOS satellite to offer broad prospects for the studies of earthquake predictions and geodynamics. ... 详细信息

关键词： instrument continental spherical aberration hasbeen correction automatically coordinate fitting Number

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SEISMICITY TENDENCY PREDICTION BEFORE 2020 IN china MAINLAND FROM ASTRONOMIC PERIODICITIES

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地震地质 1990年第1期 6-11页

作者： Du Pin-ren (institute of Geology,State seismological bureau)

The correlations between large earthquakes in china continent and periodicities of the Moon’s movement and the solar activity are statistically analysed and the following points are revealed:1. The earthquakes with ≥7.5 in Qing-Zang fault-block region have 18.6-yr periodicity of the Moon’s nodes motion.2. The earthquakes with M≥7.1 in Xinjiang fault-block region have 8.85-yr periodicity of the Moon’s perigee motion.3. The earthquakes with M≥7.0 in china mainland have the tendency to cluster around times of minima of sunspot cycles and in the even solar cycles.4. The earthquakes with M≥8.0 in china continent have the tendency to cluster around the valley times of the secular cycles of the solar *** to above correlations, the prediction of seismicity tendency can be given as follows: In china continent, especially Western china, the current active seismic period should continue up to the end of this century. The next active period would be 2006-2015.

关键词： Ascending node Perigee Solar activity Seismicity

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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 Austrialia

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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Ecological response to the climate change on the northern slope of the Tianshan Mountains in Xinjiang

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Science china Earth Sciences 2005年第6期48卷 765-777页

作者： CHEN Xi1, LUO Geping1, XIA Jun2, ZHOU Kefa1, LOU Shaoping3 & YE Minquan4.1. Xinjiang institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, china 2. institute of Geographical and Resources Sciences, Chinese Academy of Sciences, Beijing 100101, china 3. Urumqi Meteorological-satellite Land Station, Urumqi 830011, china 4. seismological bureau of Xinjiang Uygur Autonomous Region, Urümqi 830011, china Correspondence should be addressed to Chen Xi 1. Xinjiang institute of Ecology and Geography Chinese Academy of Sciences 830011 Urumqi China 2. institute of Geographical and Resources Sciences Chinese Academy of Sciences 100101 Beijing China 3. Urumqi Meteorological-satellite Land Station 830011 Urumqi China 4. seismological bureau of Xinjiang Uygur Autonomous Region 830011 Urümqi China

The Tianshan Mountains is a high and huge mountain body lying across the central part of Xinjiang, china, and is also the main area where the runoff forms in Xinjiang. In this paper, a set of RS-based study methods is put forward for deriving the information about the natural change of the ecology in arid areas, and the relationship between the climate change trend and the corresponding ecological response on the northern slope of the Tianshan Mountains since recent 4. years is analyzed from the scales of the land cover ecosystems and landscapes based on the observed data of climate, hydrology, modern glaciers and lakes on the northern slopes of the Tianshan Mountains since recent 4. years and the satellite RS data since recent 10 years by using the RS and GIS technologies. The results are as follows: (1) The overall trend of climate change on the northern slope of the Tianshan Mountains since recent 4. years is that both air temperature and precipitation are increased, especially the increase amplitudes of air tempera-ture, precipitation and annual runoff volume are high since the decade of the 1990s; (2) the in-tegrated indexes of the vegetation in all the geographical divisions on the northern slope of the Tianshan Mountains are obviously increased since recent 10 years, especially in the artificial oases and the foothill belts, such a change trend is advantageous for improving the vegetation ecology; and (3) the vegetation ecology in the arid areas is extremely sensitive to the climate change, the vegetation coverage and the biomass on the northern slope of the Tianshan Moun-tains are continuously increased because of the climate change since recent 10 years, their in-crease amplitudes in the plains and during the late stage are obviously higher than that in the mountainous regions and during the early stage.

关键词： north slope of the Tianshan Mountains, climate change, hydrological change, natural change of ecology,RS and GIS, vegetation index.

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VOLUMETRIC CHANGES IN ROCK SUBJECTED TO DIFFERENT STRESS PATHS

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地震工程学报 1985年第4期 87-93页

作者： Geng Naiguang(institute, of Geophysics, State seismological bureau, Beijing, china)

The volumetric changes in Jinan gabbro and Changping granite subject ed to three different stress paths have been studied. In all cases the rockwas first loaded to a pre-determined stress state below that which would be conducive to fracture. This was then followed by three different cases of loading. Case A: The maximum principal stress was continuously increased to induce fracture. Case B: The minimum principal stress was decreased to induce fracture. Case C. The minimum principal stress was increased to prevent fracture. The experiments showed that for the same rock dilatant behaviour was different along different stress paths. When compared with the dilatant behaviour during case A experiments(i.e. the conventional triaxial experiments) the rocks were found to be in a superdense state for a case B stress path and in an ultra-dilatant state for a case C stress path.

关键词： rock VOLUMETRIC CHANGES IN ROCK SUBJECTED TO DIFFERENT STRESS PATHS ROCK Case

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Tectonic Interpretation of the Earthquake istribution in the Contiguous Continent of the United States

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Acta Geologica Sinica(English Edition) 1993年第2期67卷 151-165页

作者： Ma Zongjin, Gao Xianglin, institute of Geology, State seismological bureau, china Wang Qi, seismological bureau of Shandong Province, china L. Seeber and J. Armbruster Lamont-Doherty Geological Observatory, Columbia University, USA Jiang Minxi

With increasing high-quality geological and geophysical data it becomes clear that seismicity of the continents is characterized by linear patterns which are closely associated with tectonic features. The aim of this paper is to give reasonable interpretation for the earthquake distribution in the contiguous continent of the United States. Seismic lines and earthquake concentrated zones are defined, which reflect the characteristics of the continental seismotectonics. Similarities and differences in seismotectonics between the continental part of china and the contiguous continent of US are analysed. It is demonstrated that the spatial distribution of earthquakes can provide the information of the active structures in the earth's crust. The authors consider that the patterns of continental seismotectonics are not only controlled by the pre—existing tectonic frameworks and the current boundary dynamic conditions, but also possibly affected by dynamic factors of global tectonics at a higher level.

关键词： patterns of earthquake epicenters seismic lines seismotectonic features

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The distribution characteristics of short period geomagnetic variations in Shaanxi region

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 64-72页

作者： GUO HUA FAN TONG QI YAO KE LI HAN KE JIA ZHU ZUO WEN GU institute of Geophysics, china seismological bureau, Beijing 100081, china 1. institute of Geophysics China Seismological Bureau 100081 Beijing China

In order to investigate the characteristics of short period geomagnetic variations in Shaanxi region, a temporary measurement profile from Shiquan in the southern part of Shaanxi to Ningxian in Gansu was set up in September of 1996 to carry out simultaneous observation of three component geomagnetic variations along the profile. The vertical transfer functions, the horizontal transfer functions and the spectral component′s relationship of each period segment at each site in the period range from 3 min to 2 h were statistically calculated. Random data theory was applied to the data processing for reference, which led to a relatively good result. Analysis of the data point out that short period geomagnetic variations are affected by the regional influence of underground anomalous inductive current concentration between Wugong and Qianling in the nearly E W direction and by the influence of local inductive current in nearby area of measurement site. The main distribution feature is that vertical transfer functions reverse between Wugong and Qianling and frequency responses of the transfer functions have maximum at period about 20 min.

关键词： geomagnetic vertical transfer function geomagnetic horizontal transfer function anomalous inductive current concentration

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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

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LATE CENOZOIC TECTONICS ALONG THE NORTHWESTERN MARGIN OF THE TARIM BASIN: INTERACTIONS BETWEEN THE TARIM BASIN AND THE SOUTHERN TIAN SHAN, WEST china

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地学前缘 2000年第S1期7卷 323-325页

作者： Chen Jie 1, Qu Guosheng 1, Shen Jun 2, Edward Sobel 3, Nan Ling 4. Tian Qinjian 5,Yin Jinhui 1 (1 institute of Geology, china seismological bureau, P.O.Box 9803, Beijing 100029,china, E\|mail chenjie@*** 2.seismological {4. of X

The Late Cenozoic fold\|and\|thrust zone along the northwestern margin of the Tarim Basin and the adjacent Tian Shan of Central Asia is an actively deforming part of the India\|Asia collision system. This deformation zone has two remarkable oppositely vergence arcuate fold\|and\|thrust systems (Kepingtage and Kashi\|Atushi fold\|and\|thrust belts) reaching from east of Keping to west of Kashi. This shape is manifested by structure, topography and seismicity. From north to south, this deformation zone is characterized by four main kinematic elements: (1) a hanging\|wall block (Maidan fault and Tuotegongbaizi\|Muziduke thrust system) that represents the Cenozoic reactivation of a late Paleozoic thrust system; (2) an imbricated thrust stack (Kepingtage\|Tashipeshake thrust system) where slices of Tarim platform sediments are thrust south toward the basin; (3) the Kashi\|Atushi fold\|and\|thrust system where thrusting and folding verge toward the Tian Shan; (4. a foot\|wall block (Tarim craton) that dips gently northwest below the sediment\|filled southern Tian Shan basin and generally has little internal deformation.

关键词： Late Cenozoic tectonics Northwestern Tarim basin Tian Shan folding and thrusting shortening rate

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