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Science China(Technological Sciences) 2008年第S2期51卷 154-163页

作者： DONG ShaoPeng,HAN ZhuJun & AN YanFen national {1. of seismic fault study,Institute of Geology,China Earthquake Administration,Beijing 1.0029,China 1. national center of seismic fault study Institute of Geology China Earthquake Administration Beijing 100029 China

Surface deformation,along national Highway 21. at the epi{1. of Wenchuan M8 earthquake,at Yingxiu Town of Sichuan Province,China,is surveyed and measured in *** results show two distinct *** is that no horizontal displacement displays,or dextral strike-slip component at the observation point can not be found basically,the other is that uplift amount is 2.72 m,and the short-ening amount is 0.38 m,which reflects thrust shortening deformation is not *** crust uplift amount of 2.71.m is distributed in a belt with width of 60 *** model of lower crustal flow proposed by Royden et al.(1.97) about the dynamic process in eastern margin of the Tibetan Plateau seems more suitable to explain the seismic surface deformation characteristics at Yingxiu Town,the epi{1. of the May 1.,2008 Wenchuan M8 Earthquake.

关键词： Wenchuan M8 Earthquake Yingxiu Town surface deformation

Cascading multi-segment rupture process of the 2023 Turkish earthquake doublet on a complex fault system revealed by tele{1. P wave back projection method

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Earthquake Science 2024年第2期37卷 158-173页

作者： Bonan Cao Zengxi Ge Department of Geophysics School of Earth and Space SciencesPeking UniversityBeijing 100871China Hebei Hongshan national Geophysical Observatory for Thick Sediments and {1. Hazards Peking UniversityBeijing 100871China

In this study,the vertical components of broadband tele{1. P wave data recorded by China Earthquake Network are used to image the rupture processes of the February 6th,2023 Turkish earthquake doublet via back projection *** in two frequency bands(0.5-2 Hz and 1.3 Hz)are used in the imaging *** results show that the rupture of the first event extends about 200 km to the northeast and about 1.0 km to the southwest,lasting~90 s in *** southwestern rupture is triggered by the northeastern rupture,demonstrating a sequential bidirectional unilateral rupture *** rupture of the second event extends approximately 80 km in both northeast and west directions,lasting~35 s in total and demonstrates a typical bilateral rupture *** cascading ruptures on both sides also reflect the occurrence of selective rupture behaviors on bifurcated *** addition,we observe super-shear ruptures on certain fault sections with relatively straight fault structures and sparse aftershocks.

关键词： 2023 Turkish earthquake doublet back projection method cascading segmented rupture process coseismic triggering super-shear ruptures

Differences in both the structure and interaction of the crust and mantle on the eastern and western sides of the Ordos Block

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Science China Earth Sciences 2024年

作者： Yong CHEN Yifang CHEN Jiuhui CHEN Biao GUO Yu LI Panpan ZHAO State Key Laboratory of seismic Dynamics Institute of GeologyChina Earthquake Administration national Field Scientific Observatory for Continental Rift Valley Dynamics in Taiyuan Institute of Earthquake Forecasting China Earthquake AdministrationKey Laboratory for Earthquake Prediction

The Ordos Block, the western part of the North China Craton (NCC), has preserved most of its cratonic lithospheric roots during the destruction and modification of the NCC, and nowconnects two distinctly different tectonic units, i.e., the Tibetan Plateau (TP) to the west and the North China Plain to the east. It is important to studythe detailed crust-mantle structure of the Ordos Block and surroundings to understand the interactions between the Ordos and adjacent regions and the dynamics of the NCC evolution. In this study, the S-wave velocity structure at depths of 0–1.0 km along an E-W profile at around 36.5°N from the Qilian orogen (QLO) to the Trans-North China Orogen (TNCO) within the NCC was investigated by joint inversion of the receiver functions (RFs) and surface wave dispersion data from 1.4 broadband seismic stations deployed in the region under the ChinArray project (Phase Ⅱ and Phase Ⅲ). The image of discontinuity structures along the profile was further constructed by common conversion point stacking of RFs. The main results are as follows:(1. The depth of the Moho in the study region gradually decreases from west to east, being the deepest in the QLO, the second in the Ordos Block, and the shallowest in the TNCO. Local depression and uplift of the Moho are also identified beneath the Haiyuan fault zone and the Shanxi-Shaanxi rift system (SSR), respectively.(2) The crust-mantle structure displays obvious lateral heterogeneities among tectonic regions. A pronounced low-velocity anomaly is observed at depths of 20–40 km beneath the QLO and becomes weakened and thinned to the east, indicating that thickening of the mid-to-lower crust probably occurred in the QLO during the growth and lateral extrusion of the northeastern TP under the resistance of the NCC. The lithosphere-asthenosphere boundary beneath the TNCO is imaged at～90 km depth, which is significantly shallower than that beneath the Ordos *** observation suggests that the lithosphere of t

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Interseismic slip distribution and locking characteristics of the mid-southern segment of the Tanlu {1. zone

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Earthquake Research Advances 2024年第3期4卷 16-26页

作者： Shuyuan Yu Layue Li Jiaji Luo Yuanyuan Yang Anhui Earthquake Agency Hefei230031China Anhui Mengcheng national Geophysical Observatory MengCheng200527China China University of Mining and Technology Xuzhou221116China The First Monitoring and Application center Tianjin300180China

We employ the block negative dislocation model to invert the distribution of fault coupling and slip rate deficit on the different segments of the Tanlu(Tancheng-Lujiang) fault zone, according to the GPS horizontal velocity field from 1.91.to 2007(the first phase) and 201. to 201.(the second phase). By comparing the deformation characteristics results, we discuss the relationship between the deformation characteristics with the M earthquake in Japan. The results showed that the fault coupling rate of the northern section of Tancheng in the second phase reduced compared with that in the first phase. However, the results of the two phases showed that the northern section of Juxian still has a high coupling rate, a deep blocking depth, and a dextral compressive deficit, which is the enrapture section of the 1.68 Tancheng earthquake. At the same time, the area strain results show that the strain rate of the central and eastern regions of the second phase is obviously enhanced compared with that of the first phase. The occurrence of the great earthquake in Japan has played a specific role in alleviating the strain accumulation in the middle and south sections of the Tanlu fault zone. The results of the maximum shear strain show that the shear strain in the middle section of the Tanlu fault zone in the second phase is weaker than that in the first phase, and the maximum shear strain in the southern section is stronger than that in the first phase. The fault coupling coefficient of the south Sihong to Jiashan section is high, and it is also the unruptured section of historical earthquakes. At the same time, small earthquakes in this area are not active and accumulate stress easily, so the future earthquake risk deserves attention.

关键词： Tanlu fault Middle-southern segment GPS velocity field Inter-seismic slip fault couping Steepest descent method

Rapid report of source parameters of 2023 M6.2 Jishishan,Gansu earthquake sequence

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Earth and Planetary Physics 2024年第2期8卷 436-443页

作者： ZhiGao Yang Jie Liu YingYing Zhang Wen Yang XueMei Zhang China Earthquake Networks center Beijing 100045China

The M6.2 earthquake in Jishishan,Gansu Province,on December 1.,2023,caused extraordinary earthquake *** was located in the northern part of the north−south seismic zone,which is a key area for earthquake monitoring in *** newly built dense strong motion stations in this area provide unprecedented conditions for high-precision earthquake relocation,especially the earthquake focal *** paper uses the newly built strong motion and traditional broadband seismic networks to relocate the source locations of the M3.0 and above aftershocks and to invert their focal *** horizontal error of earthquake location is estimated to be 0.5−1.km,and the vertical error is 1.2 *** focal depth range of aftershocks is 9.6−1..6 km,distributed in a 1.-km-long strip with SSE *** in the south are more concentrated horizontally and vertically,while aftershocks in the north are more *** focal mechanisms of the main shock and aftershocks are relatively consistent,and the P-axis orientation is consistent with the regional strain *** is a seismic blank area of M3.0 and above,about 3−5 km between the main shock and *** is suggested that the energy released by the main shock rupture is concentrated in this *** on the earthquake location and focal mechanism of the main shock,it is inferred that the Northern Lajishan fault zone is the seismogenic structure of the main shock,and the main shock did not occur on the main fault,but on a secondary *** initial rupture depth and centroid depth of the main shock were 1..8 and 1..0 km,*** source rupture depth may not be the main reason for the severe earthquake disaster.

关键词： Jishishan earthquake earthquake relocation focal mechanism strong motion data

Deep-large faults controlling on the distribution of the venting gas hydrate system in the middle of the Qiongdongnan Basin, South China Sea

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China Geology 2024年第1期7卷 36-50页

作者： Jin-feng Ren Hai-jun Qiu Zeng-gui Kuang Ting-wei Li Yu-lin He Meng-jie Xu Xiao-xue Wang Hong-fei Lai Jin Liang national Engineering Research {1. of Gas Hydrate Exploration and Development Guangzhou 511458China Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 511458China China Geological Survey Ministtry of Natural ResourcesBeijing 100037China

Many locations with concentrated hydrates at vents have confirmed the presence of abundant thermogenic gas in the middle of the Qiongdongnan Basin(QDNB).However,the impact of deep structures on gasbearing fluids migration and gas hydrates distribution in tectonically inactive regions is still *** this study,the authors apply high-resolution 3D {1. and logging while drilling(LWD)data from the middle of the QDNB to investigate the influence of deep-large faults on gas chimneys and preferred gasescape *** findings reveal the following:(1.Two significant deep-large faults,F1.and F2,developed on the edge of the Songnan Low Uplift,control the dominant migration of thermogenic hydrocarbons and determine the initial locations of gas chimneys.(2)The formation of gas chimneys is likely related to fault activation and *** chimney 1.is primarily arises from convergent fluid migration resulting from the intersection of the two faults,while the gas chimney 2 benefits from a steeper fault plane and shorter migration distance of fault F2.(3)Most gas-escape pipes are situated near the apex of the two *** reactivations facilitate free gas flow into the GHSZ and contribute to the formation of fracture‐filling hydrates.

关键词： Venting gas hydrates Deep-large faults Gas chimney Gas-escape pipes High-resolution 3D seismic Logging while drilling Qiongdongnan Basin South China Sea

The numerical method of Fourier eigen transform and its application in seismicity analysis

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Acta Seismologica Sinica(English Edition) 1997年第6期10卷 59-65页

作者：陈兵郑治真江在森 1. The Second Crustal Deformation Monitoring center SSB 710054 Xi’an China2. National Center for Seismic Data and Information SSB 100045 Beijing China

This paper′s aim is to study the numerical method of Fourier eigen transform. The characteristics of eigen bases, the Hermite function are analyzed. And a valuable result of eigen coefficients a n by means of Gauss Hermite integral is gotten. Through talking about amplitude frequency peculiarities of basic signals, we prove that the method applied in this paper possesses higher precision and smaller computation quantity. Finally, we conducted quasi real time FET analysis in {1.ity, tentatively probed into the feasibility of FET in {1. prediction, obtained something of practical value.

关键词： Fourier eigen transform earthquake sequence Gauss Hermite integral off point quasi real time spectrum

The application of resistivity tomography to hydrogeological exploration

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Acta Seismologica Sinica(English Edition) 1997年第6期10卷 110-119页

作者：冯锐李晓芹陶裕录孙次昌刘晓芹郝锦绮 1. national {1. for seismic Data and Information 100045 Beijing China 2. Institute of Geophysics State Seismological Bureau 100081 Beijing China

Resistivity tomography, an advanced technique reconstructing resistivity image from a series of potential survey of electrode arrays is quite different from the non linear inversion of wave problems. The main problem in the resistivity reconstruction is how to solve the Poisson′s equation of direct current fields in voluminous media and to complete the inversion iteration efficiently. A mathematical idea of cascade algorithm proposed by Shima (1.92), as an example, is introduced briefly in this paper. The emergence of water flood in tunnels in Wennan Coal Mine, Shandong Province, gave us chances to carry out hydrogeological exploration twice using resistivity tomography in 1.95～1.96. Three profiles with a total length of 5832 m and a maximum depth of 1.0 m in tomograms are completed. The series of resulting tomograms distinctly reveal the distributions of stratigraphic structure, mined out areas, fracture zones, crack belts and piping water loss zones. These results from tomograms are verified by drill records and then successfully adopted in the followed hydrogeological engineering in the coal mine. Finally, the authors discussed the technical method and existing problems in resistivity tomography.

关键词： resistivity tomography hydrogeological exploration fracture imaging karst

Beating the fault-Tolerance Bound and Security Loopholes for Byzantine Agreement with a Quantum Solution

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Research 2024年第3期2023卷 445-455页

作者： Chen-Xun Weng Rui-Qi Gao Yu Bao Bing-Hong Li Wen-Bo Liu Yuan-Mei Xie Yu-Shuo Lu Hua-Lei Yin Zeng-Bing Chen national Laboratory of Solid State Microstructures and School of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education)Renmin University of ChinaBeijing 100872China.

Byzantine agreement,the underlying core of blockchain,aims to make every node in a decentralized network reach *** Byzantine agreements unavoidably face two major *** is 1.3 fault-tolerance bound,which means that the system to tolerate f malicious players requires at least 3f+1.*** other is the security loopholes from its classical cryptography ***,we propose a Byzantine agreement framework with unconditional security to break this bound with nearly 1.2 fault tolerance due to multiparty correlation provided by quantum digital *** is intriguing that quantum entanglement is not necessary to break the 1.3 fault-tolerance bound,and we show that weaker correlation,such as asymmetric relationship of quantum digital signature,can also *** work strictly obeys two Byzantine conditions and can be extended to any number of players without requirements for multiparticle *** experimentally demonstrate three-party and five-party consensus for a digital *** work indicates the quantum advantage in terms of consensus problems and suggests an important avenue for quantum blockchain and quantum consensus networks.

关键词： methods. quantum signature

Deep seismic sounding data reveal the crustal structures beneath Zoigê basin and its surrounding folded orogenic belts

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Science China Earth Sciences 2010年第2期53卷 203-212页

作者： JIA ShiXu,ZHANG XianKang,ZHAO JinRen,WANG FuYun,ZHANG ChengKe,XU ZhaoFan,PAN JiShun,LIU Zhi,PAN SuZhen & SUN GuoWei Geophysical Exploration center,China Earthquake Administration,Zhengzhou 450002,China 1. Geophysical Exploration center China Earthquake Administration Zhengzhou 450002 China

Songpan-Garze massif is located at the turning position of tectonics from the nearly west-east direction to the nearly north-south direction in the northeastern margin of Tibetan Plateau,with Zoigê basin in the centre of the *** this paper,we build a crustal structure model of Zoigê basin and its surrounding folded orogenic belts using the deep seismic sounding data in this *** also discuss structures and properties of the basement in Zoigê basin,tectonic relations between Zoigê upland basin and its surrounding folded orogenic belts,crustal deformation and thickening in the northeastern margin of Tibetan Plateau,and decoupling and relaxing processes in the *** results indicate that a special "Mesozoic basement" is formed of Triassic rocks with high density (2.65-2.75 g/cm3) and high velocity (5.6 km/s) in Zoigê ***-Garze tectonic massif was transformed into two types of tectonic units with different crustal structures,i.e.,relatively stable Zoigê upland basin and active folded orogenic belts around the basin,in the course of the crustal material of Tibetan Plateau flowing eastward and obstructed by surrounding stable *** thickening of the crust in the northeastern margin of Tibetan Plateau mainly occurred in the mid and lower crust,and the structure characterized by low velocities and multiple reflectors obviously appears in the folded orogenic belts around Zoigê *** implies that the mid and lower crust underwent a strong tectonic deformation in the folded orogenic *** thickness of the crust is about 50 km in Zoigê basin and the folded orogenic belts at the both southern and northern sides of Zoigê *** "Mountain root" cannot be *** is inferred that during the later orogenic period the eastwards flowing deep materials moved clockwise along the relatively relaxing southern side around the eastern tectonic knot under the obstructing of surrounding rigid massifs,and it resulted in the strong stretching action

关键词： Zoigê basin folded orogenic belt deep seismic sounding basement structure crustal structure and tectonics