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Research on dynamics patterns and parameter characters of crustal deformation field before and after strong earthquake

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Acta Seismologica Sinica(English Edition) 1998年第1期11卷 47-55页

作者：周硕愚施顺英吴云杨国华李正媛王若柏 1. Institute of Seismology State Seismological Bureau 430071 Wuhan China 2. The First Crustal Deformation Monitoring center State Seismological Bureau 300180 Tianjin China

Based on the dynamic monitoring data of crustal deformation, the parameter evolution for the dynamics pattern and fractal dimension of crustal deformation field and the integral activity level of many faults etc. before and after the Tangshan (1.76) and Lijiang (1.96) strong earthquakes and others are studied by using the method of pattern dynamics. It is exposed that two time space characters, the ordered dimension drop of the deformation field and the accelerated motion of multi fault before an earthquake, are probably caused by the deformation localization and fault softening after the seismogenic process enters the nonlinear stage. They could be an important seismic precursor if they occurred repeatedly before strong earthquakes.

关键词： crustal deformation dynamic pattern process of dimension drop accelerative motion of fault seismic precursor

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

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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 YaoLin1. Laboratory of Computational Geodynamics, Graduate University of Chinese Academy of Sciences, Beijing 1.0049, China 2 Institute of Geophysics, Chinese Earthquake Administration, Beijing 1.0081. China 1. Laboratory of Computational Geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China 2. Institute of Geophysics Chinese Earthquake Administration Beijing 100081 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 {1. 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 {1. 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

The Lithosphere Structure and its Implication for Different Metallogenic Belts beneath the Eastern South China Block

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Acta Geologica Sinica(English Edition) 2024年第S1期 2-5页

作者： CHEN Changxin Lü Qingtian CHEN Ling SHI Danian YAN Jiayong AI Yinshuang Chinese Academy of Geological Sciences SinoProbe center Chinese Academy of Geological Sciences and China Geological Survey China MNR Lab of Deep Earth Science and Technology State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences CAS center for Excellence in Deep Earth Science University of Chinese Academy of Sciences Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

The South China Block(SCB) was formed through the Neoproterozoic amalgamation of the Yangtze Block(YB), the Cathaysia Block(CB), and the accreted components of the Jiangnan orogenic belt(JNO), it is bounded by the Jiangshan–Shaoxing–Pingxiang fault(JSPF) and the Jiujiang–Shitai–Jishou fault(JSJF)(Yao et al., 201.). The SCB has undergone a series of complex geological events, including Paleozoic orogeny, Mesozoic collisions with the North China Craton(NCC) and the Indochina Block, as well as the intracontinental orogeny, leading to extensive lithospheric modifications and magmatic activities(Zhang H J et al., 2023; Fig. 1..

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seismicity changes and numerical simulation of coseismic deformation following the 2022 M_(s)6.8 Luding earthquake in Sichuan,China

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Science China Earth Sciences 2024年第8期67卷 2507-2521页

作者： Qiu MENG Zitao WANG Huai ZHANG Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Beijing Yanshan Earth Critical Zone national Research Station Beijing 101408China

The Xianshuihe fault is a major tectonic boundary between the Sichuan-Yunnan rhombic and Bayanhar blocks in Southwest *** an average left-lateral strike-slip movement of 1.–1. mm/yr,it is a fast-moving strike-slip co... 详细信息

The Xianshuihe fault is a major tectonic boundary between the Sichuan-Yunnan rhombic and Bayanhar blocks in Southwest *** an average left-lateral strike-slip movement of 10–15 mm/yr,it is a fast-moving strike-slip continental *** September 5,2022,the Ms6.8 Luding earthquake occurred along the Moxi segment of the Xianshuihe fault,reaching a maximum intensity of IX and resulting in a significant number of casualties and severe property *** earthquake broke the long-standing seismic quiescence of the Xianshuihe fault,which lasted for more than 40 years,and was followed by a significant number of *** outstanding question is how the behavior of the Xianshuihe fault and major earthquakes changed following this *** this study,we examined the changes in regional seismicity following the Luding earthquake and identified the potential for future strong earthquakes along the Xianshuihe *** used a finite element numerical method to simulate the environment of the seismogenic fault and its adjacent *** addition,we used the coseismic slip model of the Luding earthquake with the split-node method to calculate how the stress and strain fields in the surrounding area were affected by the2022 *** stress changes were resolved in the main faults,and the seismicity of adjacent faults was analyzed in conjunction with the observed seismic *** results indicate that regional tectonic movement primarily occurred to the southeast along the Moxi *** stress field is approximately north-south in tension and east-west in *** in the stress field in the epicentral region of the Luding earthquake exceeded 1 *** maximum displacement of the coseismic deformation field was concentrated between Moxi town and Tuanjie village,and the Coulomb stress of the fault zone in this region experienced the largest ***,the b-value of the Gutenberg-Richter magnitude-frequency relationship at the epicenter a

关键词： Luding earthquake seismicity Coulomb failure stress change Finite element numerical simulation

A fully-customized dataflow engine for 3D earthquake simulation with a complex topography

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Science China(Information Sciences) 2022年第5期65卷 65-80页

作者： Bingwei CHEN Haohuan FU Wayne LUK Guangwen YANG Department of Computer Science and Technology Beijing National Research Center for Information Science and Technology Tsinghua University national Supercomputer {1. in Wuxi Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua University Department of Computing Imperial College London

With HPC(high performance computing) evolving into the exascale era, improvements in computing performance and power efficiency have become increasingly more important. Based on our previous work on enabling earthquake simulations on a large scale on Sunway Taihu Light, we further explore other possibilities to improve the application through a fully-customized hardware design on reconfigurable FPGA(field programmable gate array) devices. We investigate the feasibility and the potential benefits of a complete fixed-point design. We first perform a coarse-resolution-based simulation to analyze the representation range and precision needed to capture both the total energy and the energy distribution of variables over space and time. We then derive a complete fixed-point design that identifies the suitable bitwidth for major categories of variables and dynamically represents the range through a dynamic scaling scheme. Finally, we use the optimized fixed-point design to run a case of the Wenchuan earthquake to demonstrate the potential of supporting large-scale scientific simulations on FPGA devices. The results demonstrate that an 1.-bit fixed-point design already provides an almost identical description of the seismic events in the Wenchuan scenario down to a single-precision floating-point version and provides sustainable performance equivalent to 1..1.Intel Xeon Gold 61.4 1.-core CPUs or 2.1. Sunway 260-core processors, with performance per watt(power efficiency) improved by 1..3 and 3.72 times compared with the Intel Xeon Gold 61.4 1.-core CPUs and the Sunway 260-core processors, respectively.

关键词： reconfigurable computing earthquake simulation FPGA hardware-software co-design architecture exploration

The Middle Miocene lobe-shaped and band-shaped submarine fans in the Lingshui Sag,Qiongdongnan Basin:source-to-sink system,genesis and implication

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Acta Oceanologica Sinica 2024年第4期43卷 61-79页

作者： Xingzong Yao Congjun Feng Hongjun Qu Min Zhang Daming Li State Key Laboratory of Continental Dynamics Northwest UniversityXi’an 710069China Department of Geology Northwest UniversityXi’an 710069China Exploration and Development Technology Research center of Yanchang Oilfield Co. Ltd.Yan’an 716000China Chexplor Resource Exploration Technology Co. Ltd.Huaibei 235000China

Deepwater oil and gas exploration is the key to sustainable breakthroughs in petroleum exploration *** Central Canyon gas field has confirmed the Lingshui Sag is a hydrocarbon-generating sag,and the deepwater reservoirs in the Lingshui Sag still have more fabulous oil and gas exploration *** on drilling data and three-dimensional(3D)seismic data,this paper uses seismic facies analysis,seismic attribute analysis,and coherence slice analysis to identify the types of submarine fans(lobe-shaped and band-shaped submarine fans)that developed in the Lingshui Sag during the Middle Miocene,clarify the source-to-sink system of the submarine fans and discuss the genesis mechanism of the submarine *** results show that:(1.the deepwater source-to-sink system of the Lingshui Sag in the Middle Miocene mainly consisted of a“delta(sediment supply)-submarine canyon(sediment transport channel)-submarine fan(deepwater sediment sink)”association;(2)the main factor controlling the formation of the submarine fans developed in the Lingshui Sag was on the relative sea level decline;and(3)the bottom current reworked the lobe-shaped submarine fan that developed in the northern Lingshui Sag and formed the band-shaped submarine fan with a greater sand *** paper aims to provide practical geological knowledge for subsequent petroleum exploration and development in the deepwater area of the Qiongdongnan Basin through a detailed analysis of the Middle Miocene submarine fan sedimentary system developed in the Lingshui Sag.

关键词： submarine fan source-to-sink system genesis mechanism Middle Miocene Lingshui Sag

The existence of saturated vapors in the deep source region of 201.Pohang earthquake evidenced from seismic tomography

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Earth and Planetary Physics 2024年第5期8卷 811-821页

作者： JiaWei Qian HaiJiang Zhang Lei Guo Uzonna Okenna Anyiam Changsoo Cho Kang Hyeun Ji HaoRan Ma School of Carbon Neutrality Science and Engineering Anhui University of Science and Technology College of Oceanography Hohai University Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space Sciences University of Science and Technology of China Hebei Earthquake Agency Geological and Environmental Science Hope College Earthquake Research center Korea Institute of Geoscience and Mineral Resources

Geothermal resources are a promising approach to clean renewable energy; 90% of them are deep reservoirs of hot dry rock that require hydraulic fracturing to create a network of connections among wells to enable efficient heat exchange, known as an Enhanced Geothermal System（EGS）. The Pohang EGS project in south Korea led to a devasting Mw5.5 earthquake, triggered by the reservoir's EGS stimulation, the largest earthquake known to have been induced by EGS development. Detailed investigations have been conducted to understand the cause of the Pohang earthquake; the conclusion has been that overpressurized injected fluids migrated into an unknown fault triggering this large earthquake. Detailed velocity images for the source zone of the 201. Pohang earthquake,which could be helpful for further understanding its inducing mechanism, are unavailable. However, we have assembled detailed aftershock data recorded by 41.local stations installed within about three months after the Mw5.5 Pohang earthquake, and have then applied the Vp/Vsmodel's consistency-constrained double-difference {1. tomography method to determine the high-resolution three-dimensional Vp（compressional wave velocity）, Vs（shear wave velocity）, and Vp/Vsmodels of the source region that we report here,as well as earthquake locations within the source region. The velocity images reveal that the deep source area of the 201. Pohang earthquake is dominated by low Vp, high Vs, and low Vp/Vsanomalies, a pattern that can be caused by overpressurized vapors due to high temperatures at these depths. Based on aftershock locations and velocity features, our studies support the conclusion that the 201.Pohang earthquake was triggered by injected EGS fluids that migrated into a blind fault.

关键词： Pohang earthquake tomoDDMC low Vp/Vs saturated vapors EGS

Crust and uppermost mantle structure of the Ailaoshan-Red River fault from receiver function analysis

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Science China Earth Sciences 2006年第10期49卷 1043-1052页

作者： XU Mingjie1. WANG Liangshu1. LIU Jianhua2, ZHONG Kai1. LI Hua1. HU Dezhao1.& XU Zhen1.1. Department of Earth Sciences, Nanjing University, Nanjing 21.093, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 1.0029, China 1. Department of Earth Sciences Nanjing University Nanjing 210093 China 2. Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

S-wave velocity structure beneath the Ailaoshan-Red River fault was obtained from receiver functions by using tele{1. body wave records of broadband digital {1. stations. The average crustal thickness, Vp/Vs ratio and Poisson’s ratio were also estimated. The results indicate that the interface of crust and mantle beneath the Ailaoshan-Red River fault is not a sharp velocity discontinuity but a characteristic transition zone. The velocity increases relatively fast at the depth of Moho and then increases slowly in the uppermost mantle. The average crustal thickness across the fault is 36―37 km on the southwest side and 40―42 km on the northeast side, indicating that the fault cuts the crust. The relatively high Poisson’s ratio (0.26―0.28) of the crust implies a high content of mafic materials in the lower crust. Moreover, the lower crust with low velocity could be an ideal position for decoupling between the crust and upper mantle.

关键词： receiver function, Ailaoshan-Red River fault, velocity structure, Poisson's ratio, crust and upper mantle.

Mesozoic subduction-accretion zone in northeastern South China Sea inferred from geophysical interpretations

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Science China Earth Sciences 2006年第5期49卷 471-482页

作者： ZHOU Di1. WANG Wanyin2, WANG Jialin3, PANG Xiong4, CAI Dongsheng5 & SUN Zhen1.1. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guang- zhou 51.301. China 2. College of Geological and Topographical Engineering, Chang’an University, Xi’an 71.054, China 3. Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China 4. China national Offshore Oil Co. Limited – Shenzhen Branch, Shenzhen 51.067, China 5. China national Offshore Oil Co. Limited – Research center, Beijing 1.0027, China 1. Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China 2. College of Geological and Topographical Engineering Chang’an University Xi’an 710054 China 3. Key Laboratory of Marine Geology Tongji University Shanghai 200092 China 4. China national Offshore Oil Co. Limited — Shenzhen Branch Shenzhen 518067 China 5. China national Offshore Oil Co. Limited — Research {1. Beijing 100027 China

A segment of Mesozoic subduction-accretion zone was inferred across thenortheastern South China Sea at approximately NE450 orientation. Basic evidence includes thefollowing: A belt of peek gross horizontal Bouguer gravity gradient (PGHGBA) is comparable in sizeand intensity to that of the Manila subduction-accretion zone. A belt of high positive magneticanomalies appears to the north and sub-parallel to the PGHGBA, representing the volcanic arcassociated to the subduction zone. The PGHGBA crosses obliquely both Cenozoic structures and presentseafloor topography, indicating a pre-Cenozoic age. The segment is offset left-laterally byNW-running strike-slip faults, in concord with the Mesozoic stress field of South China. Inaddition, the existence of the subduction zone is supported by wide-angle {1. data obtained indifferent years by different institutions. At approximate localities, a north-dipping ramp of Mohosurface is indicated by records of ocean-bottom seismometers, and a strong reflector about 8 kmbeneath the Moho reflector is indicated by both OBS and long-cable {1. records. Theidentification of a segment of Mesozoic subduction zone in NE South China Sea fills nicely the gapof the Great Late Mesozoic Circum SE Asia Subduction-acrretion Zone, which extended from Sumatra,Java, SE Kalimantan to N Palawan, and from Taiwan, Ryukyu to SW Japan.

关键词： Mesozoic, subduction zone, SE Asia, NE South China Sea, geophysics.