检索结果-南通市图书馆

DEEP TECTONOTHERMAL MECHANISM FOR THE TECTONIC EXTENSION OF THE EASTERN ASIAN CONTINENTAL MARGIN

在线全文

学校读者我要写书评

暂无评论

Geotectonica et Metallogenia 2003年第1期27卷 156-164页

作者： ZHANG Jian and shi yaolin(laboratory of computational geodynamics, graduate school of the chinese academy of sciences,beijing 100039, china) laboratory of computational geodynamics Graduate School of the Chinese Academy of Sciences Betjing 100039 China

The continental marginal extension concept developed by chinese geologists recently may be applied to the explanation about the Cenozoic extension and divergent movement of the Eastern Asian continental margin. From the viewpoint of continental marginal extension, this paper discusses the deep tectonothermal mechanism of the tectonic extension of the Eastern Asian continental *** Eastern Asian continental margin is an extensional belt with intensive magmatism and structural deformation, geophysically characterized by continual earthquakes and obvious geothermal *** tomographical results about the Eastern Asian continental margin imply that the Pacific Plate is subducted toward the Eurasian Plate at a low angle and the diving Pacific Plate lies on the surface of the 670-km phase transitional zone. We interpret this feature to be resulted from retrogressive subduction followed by continental marginal extension. Our thermal modeling and geodynamical computation results suggest that the retrogressive subduction occurred at about 76Ma and the withdrawal of the trench served to supply the volume for the continental growth, which led to the formation of the growing front of the Eastern Asian continental margin. The growth width of the Eastern Asian continental margin is about 700 km.

关键词： the Eastern Asian continental margin tectonothermal modeling retrogressive subduction continental marginal growth

Virtual ChuanDian--A parallel numerical modeling of Sichuan-Yunnan regional strong earthquake activities: Model construction and parallel simulation

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2009年第10期52卷 1585-1598页

作者： ZHANG Huai1, WU ZhongLiang1,2, ZHANG DongNing2, LIU Jie2, WANG Hui2, YAN ZhenZhen1,2 & shi yaolin11 laboratory of computational geodynamics, graduate University of chinese academy of sciences, beijing 100049, china 2 Institute of Geophysics, chinese Earthquake Administration, beijing 100081, china laboratory of computational geodynamics Graduate University of Chinese Academy of Sciences Beijing China Institute of Geophysics Chinese Earthquake Administration Beijing China

Reasonable use of mathematical modeling and numerical simulation of regional earthquake activities has attracted more and more attentions in realistic seismicity studies in recent years. The inherent nature of their attendant multi-scale properties, from either the temporal or the spatial direction, necessitates the use of the cutting-edge massive parallel data processing techniques. Our study here is focused on the model construction and numerical simulation of the regional stress evolution after large earthquake sequences along the fault zones in Sichuan and Yunnan areas, using large-scale parallel finite element approximations with tens of millions of unstructured meshes on the distributed systems. The objective of our study is to provide a state-of-the-art model and a large-scale numerical simulation platform, on which estimation of the risk of large earthquake triggering sequences can be carried out in a middle or long-term time scale with realistic data and constrains inputted from field observation and geological survey.

关键词： Sichuan-Yunan area seismic processing parallel simulation initial stress field

Convergence analysis of the adaptive finite element method with the red-green refinement

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2010年第2期53卷 499-512页

作者： ZHAO XuYing 1, 3 , HU Jun 2,? & shi ZhongCi 1 1 State Key laboratory of Scientific and Engineering Computing, Institute of computational Mathematics and Scientific/Engineering Computing, academy of Mathematics and Systems Science, chinese academy of sciences, beijing 100190, china 2 Key laboratory of Mathematics and Applied Mathematics (Peking University), Ministry of Education and school of Mathematical sciences, Peking University, beijing 100871, china 3 graduate University of chinese academy of sciences, beijing 100190, china State Key laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing China graduate University of chinese academy of sciences Beijing China Key laboratory of Mathematics and Applied Mathematics (Peking University) Ministry of Education and School of Mathematical Sciences Peking University Beijing China

In this paper, we analyze the convergence of the adaptive conforming P 1 element method with the red-green refinement. Since the mesh after refining is not nested into the one before, the Galerkin-orthogonality does not hold for this case. To overcome such a difficulty, we prove some quasi-orthogonality instead under some mild condition on the initial mesh (Condition A). Consequently, we show convergence of the adaptive method by establishing the reduction of some total error. To weaken the condition on the initial mesh, we propose a modified red-green refinement and prove the convergence of the associated adaptive method under a much weaker condition on the initial mesh (Condition B).

关键词： red-green refinement adaptive finite element method convergence non-nested local refinement

^(13)C NMR spectra of tectonic coals and the effects of stress on structural components

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2005年第9期48卷 1418-1437页

作者： JU Yiwen1,2, JIANG Bo1, HOU Quanlin2, WANG Guiliang1 & NI Shanqin2 1. College of Mineral Resource and Geosciences, china University of Mining and Technology, Xuzhou 221008, china 2. laboratory of computational geodynamics, College of Geosciences, graduate school of chinese academy of sciences, beijing 100049, china College of Mineral Resource and Geosciences China University of Mining and Technology Xuzhou China laboratory of computational geodynamics College of Geosciences Graduate School of Chinese Academy of Sciences Beijing China

High-resolution 13C Nuclear Magnetic Resonance (NMR) spectra of different kinds of tectonic coals were obtained using the NMR (CP/MAS+TOSS) method. On the basis of this, after simulation synthesis and division of spectra, the relative contents of carbon functional groups were calculated. Combined with results of Ro, max, XRD testing and element analysis, stress effects on the composition of macromolecular structures in tectonic coals were studied further. The results showed that Ro, max was not only the important index for describing coal rank, but was also effective for estimating the stress effect of tectonic coals. Under tectonic stress ac- tion, Ro, max was the most direct indicator of the coal structure and chemical components. Changes in the stacking Lc of the coal basic structure unit (BSU) and La/Lc parameters could distinguish the temperature and stress effects on metamorphic-deformed environments, and re- flected the degree of structural deformation. Therefore, on the whole, Lc and La/Lc can be used to index of the degree of structural deformation of tectonic coals. In different metamorphic and de- formed environments, different kinds of tectonic coals are formed under structural stress. The changes in characteristics of the macromolecular structure and chemical composition are such that as the increase in structural deformation becomes stronger, from the brittle deformation coal to ductile deformation coal, the ratio of width at the half height of the aromatic carbon and ali- phatic carbon peaks (Hfa/Hfal ) was increased. As carbon aromaticity was raised further, carbon aliphaticity reduced obviously and different compositions of macromolecular structure appeared as a jump and wave pattern except for in wrinkle structure coal, which might result chiefly from stress effects on the macromolecular structure of different kinds of tectonic coals. The macro- moecular changes of wrinkle structure coal are reflected mainly on physical structure. In the metamorphi

关键词： tectonic coal, NMR, macromolecular structure, chemical component, stress effect.

Three-dimensional thermal structure of the chinese continental crust and upper mantle

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2007年第10期50卷 1441-1451页

作者： AN MeiJian1,2? & shi yaolin1 1 laboratory of computational geodynamics, graduate University of chinese academy of sciences, beijing 100049, china 2 Key laboratory of Crust Deformation and Processes and Institute of Geomechanics, chinese academy of Geological sciences, beijing 100081, china laboratory of computational geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China Key laboratory of Crust Deformation and Processes and Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China laboratory of computational geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China

We invert S-wave velocities for the 3D upper-mantle temperatures, in which the position with a temperature crossing the 1300℃ adiabat is corresponding to the top of the seismic low velocity zone. The temperatures down to the depth of 80 km are then calculated by solving steady-state thermal conduction equation with the constraints of the inverted upper-mantle temperatures and the surface temperatures, and then surface heat flows are calculated from the crustal temperatures. The misfit between the calculated and observed surface heat flow is smaller than 20% for most regions. The result shows that, at a depth of 25 km, the crustal temperature of eastern china (500―600℃) is higher than that of western china ( china are higher than the adiabatic temperature of 1300℃, while that beneath west china is lower. The Tarim craton and the Sichuan basin show generally low temperature. At a depth of 150 km, temperatures beneath south china, eastern Yangtze craton, North china craton and around the Qiangtang terrane are higher than the adiabatic temperature of 1300℃, but is the lowest beneath the Sichuan basin and the regions near the Indian-Eurasian collision zone. At a depth of 200 km, very low temperature occurs beneath the Qinghai-Tibet Plateau and the south to the Tarim craton.

关键词： crust, upper mantle, temperature, seismic velocity, china

Preconditioners for higher order edge finite element discretizations of Maxwell's equations

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2008年第8期51卷 1537-1548页

作者： ZHONG LiuQiang1,2,SHU shi1,2,SUN DuDu3&TAN Lin4 1school of Mathematical and computational sciences,Xiangtan University,Xiangtan 411105,china 2Hunan Key laboratory for Computation and Simulation in Science and Engineering,Xiangtan 411105,china 3Institute of computational Mathematics and Scientific/Engineering Computing,academy of Mathematicsand Systems Science,graduate University of chinese academy of sciences,chinese academy sciences,P.O.Box 2719,beijing 100190,china 4Department of Math-Physics,Nanhua University,Hengyang 421001,china school of Mathematical and computational sciences Xiangtan University Xiangtan China Hunan Key laboratory for Computation and Simulation in Science and Engineering Xiangtan China Institute of computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Graduate University of Chinese Academy of Sciences Chinese Academy Sciences Beijing China Department of Math-Physics Nanhua University Hengyang China

In this paper,we are concerned with the fast solvers for higher order edge finite element discretizations of Maxwell's *** present the preconditioners for the first family and second family of higher order N′ed′elec element equations,*** combining the stable decompositions of two kinds of edge finite element spaces with the abstract theory of auxiliary space preconditioning,we prove that the corresponding condition numbers of our preconditioners are uniformly bounded on quasi-uniform *** also present some numerical experiments to demonstrate the theoretical results.

关键词： preconditioner higher order edge finite element stable decomposition

Origin of tectonic stresses in the chinese continent and adjacent areas

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2007年第1期50卷 67-74页

作者： ZHU ShouBiao1,2& shi yaolin3 1 Institute of Crustal Dynamics, china Earthquake Administration, beijing 100085, china 2 Department of Geophysics, Peking University, beijing 100871, china 3 laboratory of computational geodynamics, graduate University of chinese academy of sciences, beijing 100049, china Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China Department of Geophysics Peking University Beijing 100871 China laboratory of computational geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China

Based on data of principal stress orientation from focal mechanism and of geological features in china, we made pseudo-3D genetic algorithm finite element (GA-FEM) inversion to investigate the main forces acting on the chinese continent and adjacent areas which form the chinese tectonic stress field. The results confirm that plate boundary forces play the dominant role in forming the stress field in china, as noticed by many previous researchers. However, we also find that topographic spreading forces, as well as basal drag forces of the lower crust to the upper crust, make significant contribution to stresses in regional scale. Forces acting on the chinese continent can be outlined as follows: the collision of the India plate to the NNE is the most important action, whereby forces oriented to the NW by the Philippine plate and forces oriented to the SWW by the Pacific plate are also important. Topographic spreading forces are not negligible at high topographic gradient zones, these forces are perpendicular to edges of the Tibetan Plateau and a topographic gradient belt running in the NNE direction across Eastern china. Basal drag forces applied by the ductile flow of the lower crust to the base of upper crust affect the regional stress field in the Tibetan Plateau remarkably, producing the clockwise rotation around the eastern Himalaya syntax.

关键词： genetic algorithm finite element method topographic spreading forces ductile lower crust chinese continent.

Preliminary analysis of earthquake probability based on the synthetic seismic catalog

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2020年第7期63卷 985-998页

作者： Yunqiang SUN Gang LUO Caibo HU yaolin shi school of Geodesy and Geomatics Wuhan UniversityWuhan 430079China Key laboratory of computational geodynamics of chinese academy of sciences College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China College of Transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China

The analysis of seismic hazards relies on the statistical analysis of historical seismic data and the instrumental seismic catalog to obtain the regional earthquake recurrence interval and earthquake *** accuracy of analysis thus depends strongly on the completeness of the seismic data ***,available seismic catalogs are too short or incomplete for the reliable analysis of the statistical characteristics of *** a long-term synthetic seismic catalog can be generated using a physics-based numerical simulation,and the simulation results match the crustal deformation,seismicity,and other observations,then such a synthetic catalog helps us to further understand the characteristics of seismic activity and analyze the regional seismic *** this paper,taking the northeastern Tibetan Plateau as a case study,we establish a three-dimensional visco-elastoplastic finite-element model to simulate earthquake cycles and the spatiotemporal evolution of earthquakes on the model fault system and obtain a seismic catalog on a time scale of tens of thousands of *** the basis that the model satisfies the regional geodynamics of the northeastern Tibetan Plateau,we analyze seismicity on the northeastern Tibetan Plateau using the simulated synthetic earthquake *** characteristics of earthquake recurrence at different locations and different magnitudes,and the long-term average probability of earthquake occurrence within the fault system on the northeastern Tibetan plateau are *** results are a reference for regional seismic hazard assessment and provide a basis for the physics-based numerical prediction of earthquakes.

关键词： Synthetic seismic catalog Seismic hazard Recurrence interval of earthquakes Earthquake probability Northeastern Tibetan Plateau

Correlation of Reservoir and Earthquake by Fluid Flow Driven Pore Network Crack Model under Parallel CPU and GPU Platforms:Zipingpu Reservoir and 2008 Wenchuan MS 8.0 Earthquake

在线全文

学校读者我要写书评

暂无评论

Correlation of Reservoir and Earthquake by Fluid Flow Driven...