依据剖面资料求解断层的水平位移     

安晓文  李世成  周瑞琦  俞维贤  陈宇军 《地震研究》2002,25(4):369-373

提出依据开挖剖面中的楔形体在受到断层作用时其厚度的变化量求解断层水平位移的方法。分析表明断层水平位移量S与楔形体在断层两侧厚度变化量Δh满足关系式S＝Δh/ρsinβ。式中ρ为楔形体在断层走向上的尖灭系数，β为断层的倾角，该关系式不仅能满足纯走滑运动的断层，而且也满足一般斜滑断层，同时提出了在剖面上判断断层水平运动性质的方法。  相似文献   

The experimental studies on electrical con-ductivities and P-wave velocities of anortho-site at high pressure and high temperature   总被引：1，自引：0，他引：1  

白利平  杜建国  刘巍  周文戈 《地震学报(英文版)》2002,15(6):667-676

Introduction The measurements of the compressional wave velocity and electrical conductivity of minerals and rocks are of fundamental importance to look into the earths interior, including composition, geotherm, generation and distribution of fluids and melts. Hydrous minerals formed by metamatu-siom are abundant within the earth. Previous studies have been carried out on the dehydration effect on the electrical conductivity and wave velocity of rocks such as serpentine, amphibole, most of whi…  相似文献   

Seismic structural control using semi-active tuned mass dampers   总被引：8，自引：1，他引：8  

杨润林  周锡元  刘锡荟 《地震工程与工程振动(英文版)》2002,1(1):111-118

This paper focuses on how to determine the instantaneous damping of the semi-active tuned mass damper (SATMD) with continuously variable damping. An off-and-towards-equilibrium (OTE) algorithm is employed to examine the control performance of the structure/SATMD system by considering the damping as an assumptive control action. The damping modification of the SATMD is carried out according to the proposed OTE algorithm, which is formulated based on analysis of the structural movement under external excitations, and the measured responses of the structure at every time instant. As examples two numerical simulations of a five-storey and a ten-storey shear structures with a SATMD on the roof are conducted. The effectiveness on vibration reduction of MDOF systems subjected to seismic excitations is discussed. Analysis results show that the behavior of the structure with a SATMD is significantly improved and the feasibility of applying the OTE algorithm to the structural control design of SATMD is also verified.  相似文献   

极地冰雪氢氧同位素指标及其指示意义   总被引：1，自引：0，他引：1       下载免费PDF全文

张小伟  康建成  周尚哲 《极地研究》2002,14(1):73-80

本文综述了水汽来源状况、降水季节变化、火山喷发、太阳活动等气候环境因素对极地冰雪中同位素含量的可能影响及其程度 ,以及降水区域不均衡性、降水年际不均衡性、逆温层和同位素在冰雪中的扩散迁移作用等几种不稳定因素可能对冰雪同位素分析造成的干扰 ;在此基础上 ,综述了极地冰雪中δ1 8O、δD和其差值d(d =δD - 8δ1 8O)与局部或全球气温之间的一些线性关系 (包括全球尺度 ,格陵兰地区 ,南极地区等 )及它们在空间分布上的变化规律  相似文献   

南极GRV 99027陨石:火星陨石中的一个新成员   总被引：6，自引：4，他引：6       下载免费PDF全文

王鹤年  王汝成  张富生  林承毅  张文兰  周丽娅 《极地研究》2002,14(4):300-307

来自南极格罗夫山蓝冰地区的GRV 99027陨石为一无球粒陨石,主要由橄榄石及辉石组成。棕色橄榄石具堆晶结构及镶嵌结构等火成岩浆分异结晶的特征。陨石的矿物模式组成及化学成分显示与SNC族陨石特征相似,特别是与ALHA77005陨石十分接近。后者被确定为二辉橄榄岩质辉玻无球粒陨石类(Lherozolitic-Shergotty,L-S)火星陨石。GRV 99027陨石的矿物化学特征以及FeO/MnO比值也与L-S类相似。可以初步认为GRV 99027陨石为SNC族火星陨石一个新的成员。二辉橄榄岩相当于地球的上地幔成分。陨石来自火星探部,为世界上极为稀有的火星样品,极具研究价值。  相似文献   

On the spatial relationship between landslides and causative factors on Lantau Island, Hong Kong   总被引：8，自引：0，他引：8  

C. H. Zhou  C. F. Lee  J. Li  Z. W. Xu 《Geomorphology》2002,43(3-4)

This paper presents a statistical approach to study the spatial relationship between landslides and their causative factors at the regional level. The approach is based on digital databases, and incorporates such methods as statistics, spatial pattern analysis, and interactive mapping. Firstly, the authors propose an object-oriented conceptual model for describing a landslide event, and a combined database of landslides and environmental factors is constructed by integrating the various databases within such a conceptual framework. The statistical histogram, spatial overlay, and dynamic mapping methods are linked together to interactively evaluate the spatial pattern of the relationship between landslides and their causative factors. A case study of an extreme event in 1993 on Lantau Island indicates that rainfall intensity and the migration of the center of the rainstorm greatly influence the occurrence of landslides on Lantau Island. A regional difference in the relationship between landslides and topography is identified. Most of the landslides in the middle and western parts of the island occurred on slopes with slope angles of 25–35°, while in the eastern part, the corresponding range is 30–35°. Overlaying landslide data with land cover reveals that a large number of landslides occurred in the bareland and shrub-covered area, and in the transition zones between different vegetation types. The proposed approach can be used not only to analyze the general characteristics of such a relationship, but also to depict its spatial distribution and variation, thereby providing a sound basis for regional landslide prediction.  相似文献   

基于遥感的黄河三角洲蒸散的动态分析     

潘志强  刘高焕  周成虎 《地理学报(英文版)》2003,13(4):408-415

Evapotranspiration (ET) is an important parameter for water resource management. Compared to the traditional ET computation and measurement methods, the ET computation method based on remote sensing has the advantages of quickness, precision, raster mapping and regional scale. SEBAL, an ET computation model using remote sensing method is based on the surface energy balance equation which is a function of net radiance flux, soil heat flux, sensible heat flux and latent heat flux. The former three fluxes can be computed through the parameters retrieved from remote sensing image, then the latent heat flux can be obtained to provide energy for ET. Finally we can obtain the daily ET. In this study SEBAL was applied to compute ET in the Yellow River Delta of China where water resource faces a rigorous situation. Three Landsat TM images and meteorology data of 1999 were used for ET computation, and spatial and temporal change patterns of ET in the Yellow River Delta were analysed.  相似文献   

云南滇池微生物对磷循环与沉积作用的实验研究   总被引：6，自引：0，他引：6  

东野脉兴  樊竹青  张灼  夏学惠  田升平  周建民 《化工矿产地质》2003,25(2):65-75

对滇池磷的现代沉积作用的研究中发现,滇池微生物种群和数量繁多,但能对磷溶解、转化、迁移、聚集、沉积的微生物主要有解磷菌和聚磷菌两类。在底泥磷高含量区域,解磷菌的种群和数量与底泥磷含量成负相关关系,与水体磷含量成正相关关系,而聚磷菌的种群和数量与底泥磷含量成正相关关系,与水体磷含量成负相关关系;在底泥磷低含量区域,上述相关性则相反。表明当解磷菌的种群与繁衍量大于聚磷菌的种群和繁衍量时,底泥中的磷向水体迁移,反之,水体中的磷向底质迁移、聚集。这个事实令人信服的证明了微生物对磷循环的重要作用。滇池这种活着的微生物在自然环境条件下对磷的溶解、转化、迁移、聚集和沉积的作用,对古磷块岩微生物成矿说提供了可靠的证据,且对以磷为限制性因子的湖、海、江河环境污染的防治提供了理论资料。  相似文献   

Geology, Geochemistry and Genesis of the Hongshijing Gold Deposit in Ruoqiang,Xinjiang     

肖惠良  周济元  王鹤年  崔炳芳  陈世忠 《中国地球化学学报》2003,22(3):280-288

1IntroductionTheHongshijinggolddepositislocatedinthenorthofLuobupouLakeofRuoqiang ,about 30 0kmsouthwestofHamiCity ,Xinjiang .ItwasdiscoveredbytheSixthGeologicalTeamofXinjiangduringgeo chemicalexploration .TheHongshijinggolddeposit,whichoccursinthegold bearingformationcomposedofMiddleandLateCarboniferousvolcanicandpyroclasticrocks ,isabrittle ductileshearzonetypegolddepositcontrolledbyariftbelt.TheHongshijinggolddepositislocatedinthesouthwestoftheHongshi jing -Maotoushanmineralizationb…  相似文献   

碳酸盐岩潜山储层垂向分带及油气藏流体分布规律   总被引：8，自引：1，他引：8  

王俊明  肖建玲  周宗良  梁宝琴 《新疆地质》2003,21(2):210-213

从古岩溶形成的基本条件出发，提出可溶性岩石和具溶蚀性的流动水是岩溶发育的基本条件，古岩溶与古风化壳常共生．受储层结构的非均质性、构造圈闭分割性、流体分布不完善性及高地温场等因素影响，流体在古潜山奥陶系储层的分布很复杂，孔、洞、缝发育程度及搭配好坏是决定油气产量的核心，圈闭条件与流体分布也密切相关．  相似文献