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Scaling of Reduced Energy or Apparent Stress and Its seismological Significance

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Earthquake Research in china 2002年第1期16卷 20-26页

作者： Wu Zhonglianginstitute of Geophysics, china seismological bureau, beijing 100081, china institute of Geophysics China Seismological Bureau Beijing 100081 China

Comparison between the NEIC broadband radiated energy catalogue and the Harvard CMT catalogue provides information about apparent stress. In spite of its significant uncertainties and limited reliability, the clues obtained from this comparison seem interesting in the physics of earthquakes. Scaling of apparent stress provides information about the dynamic friction along an earthquake fault. Relation between reduced energy and seismic moment implies that for strike-slip earthquakes, velocity-dependent friction plays a predominant role, while for non-strike-slip earthquakes, slip-dependent friction is predominant. It is also found that strike-slip events with extremely low apparent stress tend to occur “in single”, which is applied to the prediction of the seismic tendency following the 2001 Qinghai-Xizang (Tibet) border M W7.8 earthquake.

关键词： Broadband radiated energy Seismic moment Apparent stress Reduced energy

THE PRESSURE TRANSIENT ANALYSIS OF DEFORMATION OF FRACTAL MEDIUM

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Journal of Hydrodynamics 2008年第3期20卷 306-313页

作者： ZHANG Yi-gen TONG Deng-ke institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Research institute of geological Sciences Shengli Oilfield Company Sinopec Dongying 257015 China School of Mathematics and Computational Sciences China University of Petroleum （East China） Dongying257061 China

The assumption of constant rock properties in pressure-transient analysis of stress-sensitive reservoirs can cause significant errors in the estimation of temporal and spatial variation of pressure. In this article, the pressure transient response of the fractal medium in stress-sensitive reservoirs was studied by using the self-similarity solution method and the regular perturbation method. The dependence of permeability on pore pressure makes the flow equation strongly nonlinear. The nonlinearities associated with the governing equation become weaker by using the logarithm transformation. The perturbation solutions for a constant pressure production and a constant rate production of a linear-source well were obtained by using the self-similarity solution method and the regular perturbation method in an infinitely large system, and inquire into the changing rule of pressure when the fractal and deformation parameters change. The plots of typical pressure curves were given in a few cases, and the results can be applied to well test analysis.

关键词： stress-sensitive reservoir fractal permeability modulus pressure analysis

A New SHRIMP Age of the Xiamaling Formation in the North china Plate and Its geological Significance

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Acta Geologica Sinica(English Edition) 2007年第6期81卷 1103-1109页

作者： GAO Linzhi~(1,*)ZHANG Chuanheng~2 SHI Xiaoying~2 ZHOU Hongrui~2 WANG Ziqiang~2 SONG Biao~(1,3) 1 institute of Geology,Chinese Academy of geological Sciences,beijing 100037,china 2{4. University of Geosciences(beijing),beijing 100083,china 3 beijing SHRIMP Central,100037 beijing,china Chinese Acas Geol Sci Inst Geol Beijing 100037 Peoples R China beijing SHRIMP Cent Beijing 100037 Peoples R China china Univ Geosci Beijing 100083 Peoples R China

Setting up the hypostratotype of late Precambrian is the main aim of the research on the Meso-and Neoproterozoic in North *** chronostratigraphic position is the key in this study. However,many key horizons have not been calibrated with the high-quality isotopic *** the reported new U-Pb age with the Sensitive High-Resolution Ion Microprobe（SHRIMPⅡ）,a zircon U- Pb age was obtained of the ash bed in the Xiamaling Formation in North china Plate,yielding a weighted mean;Pb/;U age of 1368±12 *** is the first SHRIMP U-Pb age from the Xiamaling Formation in the North china Plate,and represents the depositing time of the middle part of the Xiamaling *** zircon age plays an important role to understanding geological evolution of the North china Plate during Meso-and Neoproterozoic.

关键词： SHRIMP U-Pb Dating Mesoproterozoic Xiamaling Formation North china Plate

Review on Deep Geophysical Exploration and Research in china

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Earthquake Research in china 2002年第3期16卷 283-292页

作者： Wang Chunyonginstitute of Geophysics, china seismological bureau, beijing 100081, china institute of Geophysics China Seismological Bureau Beijing 100081 China

The status of deep geophysical exploration and research in china is summarized in this paper. New achievements in the study of the velocity structure, seismotectonics and geodynamics of the crust and upper mantle are ... 详细信息

关键词： Deep geophysical exploration Velocity structure Seismotectonics Geodynamics Crust and mantle

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

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

Earthquake Science and Technology as Well as Preparedness and Reduction of Earthquake Disaster in china

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Earthquake Research in china 1999年第2期13卷 3-16页

作者： He Yongnianchina seismological bureau, beijing 100036,{4.

This paper systematically presents the state-of-the-art of preparedness and reduction of earthquake disasters in china. It contains abundant information on the goal, policy, working links, administrative organizations, and main scientific and technological approaches for earthquake disaster reduction in this country. The focus is placed on "taking science and technology as the foundation" and "management based on legal system."

关键词： Preparedness and reduction of earthquake disaster Scientific and technological foundation Management based on legal system china seismological bureau.

Kinematics and dynamics of the Mesozoic orogeny and late-orogenic extensional collapse in the Sino-Mongolian border areas

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Science china Earth Sciences 2005年第7期48卷 849-862页

作者： ZHENG Yadong 1 & WANG Tao2 1. Key Laboratory of Orogenic Belts and Crustal Evolution (Peking University), Ministry of Education, beijing 100871, china 2. institute of Geology, Chinese Academy of geological Sciences, beijing 100037, china Key Laboratory of Orogenic Belts and Crustal Evolution (Peking University) Ministry of Education Beijing 100871 China institute of Geology Chinese Academy of Geological Sciences Beijinq 100037 China

The Sino-Mongolian border areas underwent two important tectonic events during Mesozoic time after late Paleozoic orogeny: a late Triassic to earlier Jurassic contractional event that resulted in a large-scale south-vergent thrust during the orogeny and a late Jurassic-earlier Cretaceous extensional event in a north-south direction that formed a metamorphic core complex. The kinematic and dynamic analyses show that the thrust sheet moved southwards with a kinematic vorticity number of ca. -0.10 and sub-horizontal maximum compressive stress axis that belongs to a contraction-thickening shear. The upper plate of the late-orogenic detachment relatively moved in a 165°direction. The average kinematic vorticity in its earlier stage was 0.74.that belongs to simple shear dominated shearing and related to the maximum compressive stress axes dipping at ～66°, while the later average kinematic vorticity was ～0.55°that belongs to pure shear dominated shearing with sub-vertical maximum compressive stress axes. This suggests that the thrusting led to the crust thickened and the lower plate rocks that were originally located in the upper crust depressed through a brittle-ductile transition zone into the lower crust and became warmer. The heated rocks trended to uplift since their increasing volume and decreasing density while the loading of the upper-plate rocks increased due to the structural thickening. Under the combined effect of the loading and the thermal-uplifting, the ductile shear zone in between increased in its component of vertical pure shear. Once its pure-shear component exceeded its simple-shear one the ductile shear zone became an extension-thinned shear zone. This progressive transitional process reflects internal and essential temporal and spatial relationships: the extensional factor nucleated during the crust thickening by thrusting and increase of the extensional factor finally led to late-orogenic collapse.

关键词： Mesozoic thrusting,late-orogenic collapse,kinematic vorticity number,stress state.

The Characteristics of Earthquake Disasters and Countermeasures for Their Mitigation in Metropolitans

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Earthquake Research in china 2003年第4期17卷 297-304页

作者： Gao Mengtaninstitute of Geophysics, china seismological bureau, beijing 100081, china institute of Geophysics China Seismological Bureau Beijing 100081 China

Metropolitans are a result of fast economic development in china. Many metropolitans have emerged in the eastern part of china. Earthquake disasters in metropolitans are more complicated and serious than those in a smaller city, and the impact of earthquake disaster on the economy and society is large. The characteristics of earthquake disasters and countermeasures to protect against and mitigate disaster in the metropolitan, as well as some key research fields in the earthquake disaster protection and mitigation, are discussed.

关键词： Metropolitan Earthquake disaster Seismic hazard Countermeasure of disaster mitigation