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s-wave velocity and Poisson's ratio structure of crust in Yunnan and its implication

science China Earth sciences 2005年第2期48卷 210-218页

作者： HU Jiafu, sU Youjin, ZHU Xiongguan & CHEN Yun Geophysical Department of Yunnan University, Kunming 650091, China seismological Bureau of Yunnan Province, Kunming 650041, China Institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100101, China 1. Geophysical Department of Yunnan University 650091 Kunming China 2. seismological Bureau of Yunnan Province 650041 Kunming China 3. Institute of Geology and Geophysics Chinese Academy of Sciences 100101 Beijing China

Receiver function of body wave under the 23 stations in Yunnan was extracted from 3-component broadband digital recording of teleseismic event. Thus, the s-wave velocity structure and distribution characteristics of Poisson's ratio in crust of Yunnan are obtained by inversion. The results show that the crustal thickness is gradually thinned from north to south. The crustal thickness in Zhongdian of northwest reaches as many as 62.0 km and the one in Jinghong of further south end is only 30.2 km. What should be especially noted is that there exists a Moho upheaval running in Ns in the Chuxiong region and a Moho concave is generally parallel to it in Dongchuan. In addition, there exists an obvious transversal inhomogeneity for the s-wave velocity structure in upper mantle and crust in the Yunnan region. The low velocity layer exists not only in 10.0-15.0 km in upper crust in some regions, but also in 30.0-40.0 km in lower crust. Generally, the Poisson's ratio is on the high side, however it has a better corresponding relation to the crustal velocity structure. An obvious block distribution feature is still shown on such a high background of Poisson's ratio. It is discovered by synthetically analyzing the velocity structure and Poisson's ratio distribution that there are high Poisson's ratio and complicated crust-mantle velocity structure feature in the sichuan-Yunnan Diamond Block with Xiaojiang fault to be the east boundary and Yulong snow Mountain fault to be the west boundary besides the frequent seismicity. This feature differs obviously from that of surrounding areas, which would provide geophysical evidence to deeply study the eastwardly flowage of lithospheric substances in the Qinghai-Tibet Plateau.

关键词： Yunnan, s-wave velocity, Poisson's ratio, sichuan-Yunnan Diamond Block.

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Validation of the Wiedemann–Franz law in a granular s-wave superconductor in the nanometer scale

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Chinese Physics B 2017年第3期26卷 506-514页

作者： A Yousefvand H salehi M Zargar shoushtari Department of Physics Shahid Chamran University of Ahvaz Ahvaz Iran

The present study tries to evaluate the validity of the Wiedemann-Franz law in a granular s-wave superconductor in the presence of concentrated impurities. By using Green＇s function method and the Kubo formula technique, three distinct contributions of the Aslamazov-Larkin, the Maid-Thompson and, the density of states are calculated for both the electrical conductivity and the thermal conductivity in a granular s-wave superconductor. It is demonstrated that these different con- tributions to the fluctuation conductivity depend differently on the tunneling because of their different natures. This study examines the transport in a granular superconductor system in three dimensions in the limit of large tunneling conductance, which makes it possible to ignore all localization effects and the Coulomb interaction. We find that the tunneling is efficient near the critical temperature and that there is a crossover to the characteristic behavior of a homogeneous system. When it is far from the critical temperature, the tunneling is not effective and the system behaves as an ensemble of real zero-dimensional grains. The results show that the Wiedemann-Franz law is violated in both temperature regions.

关键词： granular superconductor s-wave impurity vertex fluctuation propagator

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Localization of s-wave and Quantum Effective Potential of a Quasi-free Particle with Position-Dependent Mass

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Communications in Theoretical Physics 2006年第5X期46卷 819-825页

作者： JU Guo-Xing XIANG Yang REN Zhong-Zhou Department of Physics Nanjing University Nanjing 210093 China

The properties of the 8-wave for a quasl-free partide with position-dependent mass （PDM） have been discussed in details. Differed from the system with constant mass in which the localization of the s-wave for the free quantum particle around the origin only occurs in two dimensions, the quasi-free particle with PDM can experience attractive forces in D dimensions except D = 1 when its mass function satisfies some conditions. The effective mass of a particle varying with its position can induce effective interaction, which may be attractive in some cases. The analytical expressions of the eigenfunctions and the corresponding probability densities for the 8-waves of the two- and three-dimensional systems with a special PDM are given, and the existences of localization around the origin for these systems are shown.

关键词： position-dependent mass s-wave schrodinger equation dimensionality of the space localization eigenfunction probability density

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3D s-wave Velocity structure of the Crust and Upper Mantle

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science China Chemistry 1994年第1期37卷 104-116页

作者：宋仲和安昌强陈国英陈立华庄真傅竹武吕梓龄胡家富 Institute of Geophysics State Seismological Bureau Beijing 100081 PRC Department of Geophysics Yunnan University Kunming 650091 PRC

In this paper, 238 Rayleigh wave path data are selected and processed by the matched-filtering frequency-time analysis technique and the grid dispersion inversion method to obtain the 3D s-wave velocity structure of China mainland and its adjacent sea regions. The results show that the velocity structure relates to geotectonic division, Bouguer gravity anomaly is basically controlled by the relief of Moho discontinuity, the buried depth of LVL in upper mantle concerns the surface heat flow deeply. In this paper, authors indicate the main characteristics of the velocity structure in tectonic active and stable regions.

关键词： dispersion curve of Rayleigh wave group velocity matched-filtering frequency-time analysis technique grid dispersion inversion 3D s-wave velocity structure geotectonic division.

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An evaluation of numerical approaches for s-wave component simulation in rock blasting

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第5期9卷 830-842页

作者： Qidong Gao Wenbo Lu Yingguo Hu Zhaowei Yang Peng Yan Ming Chen state Key Laboratory of Water Resources and Hydropower Engineering science Wuhan University Wuhan 430072 China Key Laboratory of Rock Mechanics in Hydraulic structural Engineering Ministry of Education Wuhan University Wuhan 430072 China

The shear wave(s-wave) component of the total blast vibration always plays an important role in damage to rock or adjacent *** approach has been considered as an economical and effective tool in predicting blast ***,s-wave has not yet attracted enough attention in previous numerical *** this paper,three typical numerical models,*** continuum-based elastic model,the continuum-based damage model,and the coupled smooth particle hydrodynamics(sPH)-finite element method(FEM) model,were first introduced and developed to simulate the blasting of a single cylindrical ***,the numerical results from different models were evaluated based on a review on the generation mechanisms of s-wave during ***,some suggestions on the selection of numerical approaches for simulating generation of the blast-induced s-wave were put *** indicate that different numerical models produce different results of *** coupled numerical model was the best,for its outstanding capacity in producing s-wave *** is suggested that the model that can describe the cracking,sliding or heaving of rock mass,and the movement of fragments near the borehole should be selected preferentially,and priority should be given to the material constitutive law that could record the nonlinear mechanical behavior of rock mass near the borehole.

关键词： Rock blasting Blast vibration s-wave Numerical approach

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Crustal s-wave velocity structure across the northeastern south China sea continental margin: implications for lithology and mantle exhumation

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Earth and Planetary Physics 2019年第4期3卷 314-329页

作者： WenAi Hou Chun-Feng Li XiaoLi Wan MingHui Zhao XueLin Qiu Institute of Marine Geology and Resources Zhejiang University Zhoushan Zhejiang 316021 China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 China state Key Laboratory of Marine Geology Tongji University Shanghai 200092 China south China sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The northeastern margin of the south China sea (sCs), developed from continental rifting and breakup, is usually thought of as a non-volcanic margin. However, post-spreading volcanism is massive and lower crustal high-velocity anomalies are widespread, which complicate the nature of the margin here. To better understand crustal seismic velocities, lithology, and geophysical properties, we present an s-wave velocity (Vs) model and a VP/Vs model for the northeastern margin by using an existing P-wave velocity (VP) model as the starting model for 2-D kinematic s-wave forward ray tracing. The Mesozoic sedimentary sequence has lower VP/Vs ratios than the Cenozoic sequence;in between is a main interface of P-s conversion. Two isolated high-velocity zones (HVZ) are found in the lower crust of the continental slope, showing s-wave velocities of 4.0–4.2 km/s and VP/Vs ratios of 1.73–1.78. These values indicate a mafic composition, most likely of amphibolite facies. Also, a VP/Vs versus VP plot indicates a magnesium-rich gabbro facies from post-spreading mantle melting at temperatures higher than normal. A third high-velocity zone (VP : 7.0–7.8 km/s;VP/Vs: 1.85–1.96), 70-km wide and 4-km thick in the continent-ocean transition zone, is most likely to be a consequence of serpentinization of upwelled upper mantle. seismic velocity structures and also gravity anomalies indicate that mantle upwelling/ serpentinization could be the most severe in the northeasternmost continent-ocean boundary of the sCs. Empirical relationships between seismic velocity and degree of serpentinization suggest that serpentinite content decreases with depth, from 43% in the lower crust to 37% into the mantle.

关键词： south China sea continental margin crustal structure converted s-wave VP/Vs ratio lithology serpentinization

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Tomography for Q of the Eastern section of the Tianshan Area from High-frequency Attenuation of s-wave

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Earthquake Research in China 2018年第1期32卷 28-39页

作者： Li Jin Zhou Longquan Wang Huilin Xiang Yuan Earthquake Agency of Xinjiang Uygur Autonomous Region Urumqi 830011China China Earthquake Networks Center Beijing 100045China Hainan Earthquake Agency Haikou 570203China

Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital seismic Network,a data set of 19,140 attenuation factors t*is obtained by fitting the high-frequency attenuation of s-wave spectra with a genetic algorithm. The spatial distribution of Q_s is determined by inverting the t*data with seismic tomography. The results show that the average Q0 in eastern Tianshan is 520,and there is a significant correlation between the Q_s value distribution or attenuation characteristics it disclosed and the surface structure of the study area. The Q_s value is lower in the intersection area of the mountain basin which is located on the north and south sides of the Tianshan Mountains,and the high Q_s distribution is more concentrated inside the Tianshan orogenic belt. The M≥6. 0 earthquakes have been basically located in the Low-Q_s region since 1900. 24 high heat flow points in eastern Tianshan are located at the north and south of Tianshan Mountains where low Q_s exists,indicating a negative correlation. In addition,there is a positive correlation between the velocity structure and the attenuation structure in the study area,which reflects the consistency of the 2-D attenuation structure with the velocity structure and the two-dimensional density structure.

关键词： Eastern section of the Tianshan area High-frequency attenuation of s-wave Attenuation operator t* Q tomography

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study of s-wave ray elastic impedance for identifying lithology and fluid

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Applied Geophysics 2013年第2期10卷 145-156,235页

作者：龚雪萍张峰李向阳陈双全中国石油大学(北京)"油气资源与探测"国家重点实验室北京102249 中国石油大学(北京)CNPC物探重点实验室北京102249

In this paper, we derive an approximation of the ss-wave reflection coefficient and the expression of s-wave ray elastic impedance （sREI） in terms of the ray parameter. The sREI can be expressed by the s-wave incidence angle or P-wave reflection angle, referred to as sREIs and sREIP, respectively. Our study using elastic models derived from real log measurements shows that sREIP has better capability for lithology and fluid discrimination than sREIs and conventional s-wave elastic impedance （sEI）. We evaluate the sREIP feasibility using 25 groups of samples from Castagna and smith （1994）. Each sample group is constructed by using shale, brine-sand, and gas-sand. Theoretical evaluation also indicates that sRE1P at large incident angles is more sensitive to fluid than conventional fluid indicators. Real seismic data application also shows that sRE1P at large angles calculated using P-wave and s-wave impedance can efficiently characterize tight gas-sand.

关键词： s-wave impedance ray parameter lithology identification fluid indicator

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Interpretation of s-wave Data from Fanshi-Taipusiqi Dss Profile and Analysis of Correlation between Deep structural Characteristics and seismicity

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Earthquake Research in China 1998年第1期12卷 27-36页

作者： Zhou Xuesong,song songyan,Zhang Xiankang,Qiu shuyan,Gong Yi,and song JianliResearch Center of Exploration Geophysics,ssB,Zhengzhou 450003,China

By processing s-wave data from the Fanshi-Huai’an-Taipusiqi Dss profile,which is a three-component,wide-angle reflection/refraction profile,and in the light of the results from P-wave interpretation,two-dimensional(2-D)structures of the crust and upper mantle are presented,including s-wave velocity Vs and the physical parameter of medium-Poisson’s ratio *** other geological and geophysical information into account,and with reference to the results from petrophysical experiments at home and abroad,we carried out interpretation and inference with respect to deep crustal structure,tectonics,and lithologic *** has been concluded that in the upper and middle crust,a values are mostly not greater than 0.25,and rocks,which generally assume brittle,are mainly composed of granite; the rocks in the lower layer of the upper crust between Yangyuan-Huai’an containing inorganic CO2 itself releases carbon; for the rocks in the lower crust and crust-mantle transitional zone,which are comparatively

关键词： s-wave velocity Poisson’s ratio lithologic character ultra-crustal fault earthquakes.

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Miscibility of Binary Bose-Einstein Condensate Mixture with Competing s- and p-wave Interaction

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Transactions of Nanjing University of Aeronautics and Astronautics 2022年第S1期39卷 143-149页

作者： PANG Jinghan DENG Min XUE Ming LI Jinbin College of Physics Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China College of Advanced Interdisciplinary studies National University of Defense TechnologyChangsha 410073P.R.China MIIT Key Laboratory of Aerospace Information Materials and Physics Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China

Combining two Bose-Einstein condensates(BECs)may result in a miscible or immiscible *** this study,we investigate the miscibility-immiscibility transition of binary BEC mixture trapped in an isotropic harmonic potential,with both inter-species s-wave and p-wave scattering interaction *** mean-field Gross-Pitaevskii equations with p-wave interaction term are numerically solved to obtain the ground-state phase *** to the pwave interaction competing with isotropic s-wave interaction,the spatial density profile of binary BEC mixtures transforming from immiscible phase to miscible phase is *** p-wave interaction caused miscibility can be observed in current experiments of Bose-Bose mixture tuned near a p-wave Feshbach resonance.

关键词： Bose-Einstein condensate(BEC) p-wave s-wave miscibility-immiscibility transition

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