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3. Velocity Structure and Its Tectonic Implications in the East china Sea and Yellow Sea

Acta Geologica Sinica(English Edition) 1993年第3期67卷 273-296页

作者： Feng Rui, Zhou Hainan, institute of geophysics, State {2. {3., Beijing Yao Zhengsheng, {2. institute of Lanzhou, Lanzhou Ma Guiming and Li Quanlin institute of geophysics, State {2. {3. Beijing Fei Zhenbi

3. structure of the crust and upper mantle in the studied area has been analyzed from surface wave tomography. The velocity distribution in the uppermost crust is symmetrical on two sides of the central line of the sea, and coincides with the structure of crystalline basement. The essential difference in tectonics between the East china Sea and the Yellow Sea mainly lies in that the velocity structures of their lower crust and upper mantle are identical to those of South china and North china respectively. In the upper mantle there exists a high-velocity zone with a nearly EW strike from the Hangzhou Bay, china, to the Tokara Channel, Japan, along about the latitude of 3.°N. It is found that between the East china Sea and the Yellow Sea there are systematical differences in geomorphology, geology, seismicity, heat flow, quality factor and gravity and aeromagnetic anomalies, which is related to both left-lateral shear dislocation and right-lateral tear of the Benioff zone from the Hangzhou Bay to the Tokara Channel.It is inferred that the East china Sea was formed by Cenozoic back-arc extension. The boundary between the North china and South china crustal blocks stretches along the southern piedmont of Mts. Daba-Dabie-Hangzhou Bay-Tokara Channel, and the subduction zone at the Okinawa trench is the eastern boundary of the South china crustal block. The movements of the Pacific plate, Indian plate and upper mantle rather than the Philippine plate subduction have played a dominant role for the modern tectonic movements in East Asia.

关键词： East china Sea and Yellow Sea 3. velocity structure surface wave tomography the Hang zhou Bay-Tokara Channel transform fault North china crustal block South china crustal block

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Estimating the Risk of Paired/Grouped Earthquakes and Strong Aftershocks for the Safety of Rescue Process and Post-Seismic Reconstruction

Estimating the Risk of Paired/Grouped Earthquakes and Strong...

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2.02.安全与科学技术国际会议

作者： WU Zhongliang (institute of geophysics {2. {3. bureau Beijing 100081 {2.)

＜正＞ Quite a few earthquakes tend to occur in pairs or groups. These paired or grouped earthquakes, as well as strong aftershocks following the main shock, threaten the safety of the rescue process and the on-going post-seismic reconstruction, increasing the seismic disasters and the economic/societal losses. One of the practical problems is whether or not the risk of paired/grouped earthquakes and strong aftershocks can he estimated by considering the physical properties of the preceding earthquake or the main shock. In this paper we reported two approaches to such an estimation based on the focal mechanism and apparent stress, respectively, of the preceding earthquake/main shock. We show that earthquakes with thrust mechanisms are more likely to occur in pairs or groups, while strike-slip earthquakes are more likely to be single. Meanwhile, strike-slip earthquakes with extremely low apparent stress or reduced energy tend to be single. These results are applied to the November 14, 2.01, Kunlunshan mountain pass, the Qinghai-Tibet border, china,MW7.8 earthquake.

关键词： earthquake strong aftershock focal mechanism reduced energy apparent stress

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The INSAR technique:its principle and applications to mapping the deformation field of earthquakes

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 103-113页

作者： XIN JIAN SHAN HONG YEinstitute of Geology, china seismological bureau, Beijing 10002.,{2.

The development, state of art and prospects of application of the radar remote sensing technique are presented. The principle of the INSAR (Interferometric Synthetic Aperture Radar) technique is expounded in more details. Some applications of this technique in measuring seismic dislocations are given. Finally, it is pointed out that INSAR has a non replaceable application potential in observing ground surface vertical deformations; it would provide an entirely new means and method for monitoring the dynamic field of earthquakes and give an extremely great impetus to the future earthquake prediction work.

关键词： radar remote sensing INSAR technique vertical deformation

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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 10002.,{2., E\|mail chenjie@*** 2.seismological bureau 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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RELATIONSHIP BETWEEN EARTHQUAKE MAGNITUDE AND EPICENTRAL INTENSITY IN china AND ITS APPLICATIONS

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Science in china,Ser.B 1985年第5期28卷 549-560页

作者：阎志德郭履灿 Lanzhou institute of Seismology State seismological bureau Institue of geophysics Beijing

This paper gives revised formulas for Chinese earthquakes, describing the relationship between earthquake magnitude, epicentral intensity and hypocentral depth, and these formulas have been derived from calculations of the data of M, I0 and h of 57 main shocks. Data have been analyzed of foreshocks and aftershocks of several major earthquakes in North china, from which the relationships between magnitude and epicentral intensity for foreshocks and aftershocks are derived. These relationships are also calculated for earthquakes of the Xinfengjiang reservoir. A comparison between these relations indicates that each of the foreshocks, aftershocks and reservoir earthquakes possesses a specific relationship between magnitude and epicentral intensity of itself, which is systematically different from that of the mainshocks.

关键词： RELATIONSHIP BETWEEN EARTHQUAKE MAGNITUDE AND EPICENTRAL INTENSITY IN china AND ITS APPLICATIONS

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Research on Earthquakes in Cities of china

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Earthquake Research in china 2003年第3期17卷 248-255页

作者： Shi Zhenliang, Cao Xuefeng and Yan Xiujieinstitute of geophysics,{2., Beijing 100081,{3. institute of geophysics.{2. Beijing 100081 China

In this paper, we briefly describe the general destruction caused by historic earthquakes in major cities of china, preliminarily analyze the heaviness and widespread occurrence of earthquakes in cities of china, and suggest that research on scenario earthquakes in cities should be developed as a part urban disaster reduction research.

关键词： City Earthquake disaster Scenario earthquake

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Mesozoic-Cenozoic thermal history of Turpan-Hami Basin: apatite fission track constraints

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Progress in Natural Science:Materials International 2005年第4期 44-49页

作者： ZHU Wenbin 1*, WAN Jinglin 2. SHU Liangshu, SUN Yan 1, GUO Jichun 1 and WANG Feng 1(1. Department of Earth Sciences, Nanjing University, Nanjing 2.0093. china 2. institute of Geology,{2., Beijing 10002., china) Department of Earth Sciences Nanjing University Nanjing 210093 China institute of Geology China Seismological BureauBeijing 100029 China

Apatite fission track dating is carried out on nine samples collected from the central part (Lianmuqin section) and from both northern and southern margins of Turpan Hami Basin. The fission track ages of seven Jurassic samples are distinctly younger than depositional ages. In contrast, the fission track ages of two Cretaceous samples are older than, or as old as depositional ages. These observations indicate that the Jurassic samples have been annealed or partially annealed, whereas the Cretaceous samples have not been annealed. The further thermal modelling results show that Turpan Hami Basin experienced a Late Cretaceous period (12.-100 Ma) of tectonic uplift with rapid cooling and exhumation of sediments. The samples underwent a Cenozoic period of reburial and re heating and were exhumed again at 10-8 Ma.

关键词： Turpan-Hami Basin apatite fission track exhumation cooling.

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The Geoscience Transect from Xiangshui,Jiangsu Province to Mandal,Inner Mongolia

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Acta Geologica Sinica(English Edition) 1992年第1期66卷 1-21页

作者： Ma Xingyuan Liu Changyuan Liu Guodong Jiang Minxi institute of Geology,State seismological {2.,Beijing Geophysical Exploration Pafrty,State seismological {2.,Zhengzhou. 2.0} of Geology State Seismological Bureau Beijing. 3.eophysical Exploration Party State Seismological Bureau Zhengzhou.

The Xiangshui to Mandal geoscience transect, which has a total length of 1,2.0 km, extends diagonally,from SE to NW, across the Sino-Korean plate and its ancient continental margin, passing through nine tectonicunits: the Subei-Jiaonan terrane, West Shandong block, North china rift basin, Taihang-Wutai block, Ordosblock, Hu-Bao (Hohhot-Baotou) Basin, Yinshan block and Inner Mongolian fold system. The graphic display of the transect is compiled according to the Guidelines for the Global GeoscienceTransect (GGT) Project on the basis of an integrated study of all available geological, geochemical andgeophysical data, thus bringing light to the process of cratonization of the Sino-Korean plate and its relation-ship with the transitional zone of the ancient continental margin, and the features of intraplate structures pro-duced by subsequent tectonic modifications and intraplate dynamics.

关键词： The Geoscience Transect from Xiangshui Jiangsu Province to Mandal Inner Mongolia

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Magnetic Fabric of Cuizhao Pluton and ItsEmplacement Significance

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Journal of Earth Science 1999年第3期18卷 274-279页

作者： Zhou Weixin(institute of Geology, china seismological bureau, Beijing 10002.)Wan Tianfeng(Department of Geology and Mineral Resources,{2. University of Geosciences, Beijing 100083. institute of Geology China Seismological Bureau Beijing 100029 Department of Geology and Mineral Resources China University of Geosciences Beijing 100083

The new micro-structural and magnetic fabric data on Cuizhao plutou and their emplacement implications are demonstrated in this peper. The magnetic foliations develop better and the degree of magnetic susceptibility anlsotropy is larger in the margin of the pluton than that in the center,which reveals mainly horizontal compression or magma during emplacement- The mapnetic lineations are not very well developed. The magnetic fabrics in the Cuizhao pluton reveal horizontal compression like the bollooning model during emplacement near the Earth surrace. This feature was fixed in later tectonic events.

关键词： granitoid pluton magnetic fabric foliation lineation emplacement mechanism

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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 10002., 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 5102.5, china Center for Analysis and Prediction, china seismological bureau, Beijing 10003., 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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