3-D rheologic model of earthquake preparation (II): Strain field and its applications     

宋治平  尹祥础  梅世蓉 《地震学报(英文版)》2004,17(2):131-143

Introduction Based on the elastic theory of the hard inclusion (Dobrovolskii, 1991), we developed an inclusion theory of rheologic medium, and applied the results of bulk-strain field of a rheologic inclusion model to explain the spatial-temporal evolution process of earthquake precursors (SONG, et al, 2000). In the former paper (SONG, et al, 2003), we derived the viscoelastic displacement field of the rheologic inclusion model on the basis of the analytic expression of displacement field o…  相似文献   

黄渤海大风的客观相似预报   总被引：8，自引：1，他引：8  

颜梅  范宝东满柯郑永光  陶祖钰 《气象科技》2004,32(6):467-470

以MICAPS资料为基础，海平面气压资料为指标，设计了一种通过计算相似系数查找相似形势，制作黄、渤海地区24h大风的客观预报方法，并建立了包括109个大风历史个例资料库。试验结果表明，风速预报的平均误差在20％以下，满足大风预报业务的要求。相似法具有不需依赖国外资料及计算简单迅速的特点，它不仅是现在日常业务的一个补充，更重要的是，它是一种可以在战争等非常情况下使用的预报方法。  相似文献   

近红外反射光谱学在岩石矿物研究中的应用Ⅱ.快速测定地质样品中有机质     

龙梅  裴世桥 《岩矿测试》2004,23(1):6-10

利用偏最小二乘法回归的多变量校正方式,建立了应用近红外反射光谱学方法无损快速测定各种地质样品中有机质的模型.设计了多重散射光校正、标准正常变量转换及导数光谱,扣除额外基线和重叠信号的影响,分离出与有机质含量有关的光谱信息.大多数地质样品的有机质近红外反射光谱估算结果与化学法符合.  相似文献   

从全国水环境数据库看中国水环境状况          下载免费PDF全文

徐美  李纪人  黄诗峰  庞治国 《水科学进展》2004,15(5):543-548

以全国水环境数据库的监测记录为第一手资料,以各大流域片为单位,从宏观上介绍了各大流域片的水质总体概况,包括各类水质所占比例、污染水质的超标物类型等,基本反映了我国各大流域在20世纪90年代的水质状况以及水环境的时空变化特征.总的来说,我国的水环境状况不容乐观,水质污染比较严重,尤其是我国北方的流域片.  相似文献   

云南省兰坪县石登—兔峨地区火山岩岩石学特征   总被引：1，自引：0，他引：1       下载免费PDF全文

李玫 《中国地质》2004,31(1):64-69

石登—兔峨地区上三叠统小定西组火山岩属云南西部澜沧江沿岸三叠系火山岩带的一部分，本文从岩相学、岩石化学和地球化学等多方面对该火山岩特征进行了系统、全面分析，并从理论角度对其形成的大地构造环境进行了判别。结果表明：该火山岩以安山岩为主，玄武岩为次，属钙碱性系列，形成于岛弧大地构造环境。  相似文献   

城市典型房屋屋顶构网及可视化研究   总被引：1，自引：0，他引：1  

柳晶辉  樊红  杨坤 《测绘信息与工程》2004,29(3):3-5

介绍了房屋屋顶构网及其三维显示的方法,给出了具体的数据结构及相应的算法流程以及房屋屋顶构网的三维显示结果.  相似文献   

山西临汾盆地近期地震活动性分析   总被引：1，自引：0，他引：1  

张红秀  张梅 《山西地震》2005,(1):4-5,17

通过对临汾盆地内近期地震活动频度和地震活动图像的分析，认为未来中强地震最有可能发生在近期地震活动较稀少的地段，能量积累的优势层位为5km～15km。  相似文献   

Estimating severity of liquefaction-induced damage near foundation   总被引：1，自引：2，他引：1  

C. Hsein Juang  Haiming Yuan  David Kun Li  Susan Hui Yang  Raymond A. Christopher 《Soil Dynamics and Earthquake Engineering》2005,25(5):403-411

An empirical procedure for estimating the severity of liquefaction-induced ground damage at or near foundations of existing buildings is established. The procedure is based on an examination of 30 case histories from recent earthquakes. The data for these case histories consist of observations of the damage that resulted from liquefaction, and the subsurface soil conditions as revealed by cone penetration tests. These field observations are used to classify these cases into one of three damaging effect categories, ‘no damage’, ‘minor to moderate damage’, and ‘major damage’. The potential for liquefaction-induced ground failure at each site is calculated and expressed as the probability of ground failure. The relationship between the probability of ground failure and the damage class is established, which allows for the evaluation of the severity of liquefaction-induced ground damage at or near foundations. The procedure presented herein represents a significant attempt to address the issue of liquefaction effect. Caution must be exercised, however, when using the proposed model and procedure for estimating liquefaction damage severity, because they are developed based on limited number of case histories.  相似文献   

DJY-2000B型地震电磁脉冲观测系统     

阎计明  赵琨  王春和 《山西地震》2005,(Z1):11-12

DJY-2000B型地震电磁脉冲观测系统主要由一对LES低频电磁传感器、DJY-2000B型电磁脉冲记录仪、通信单元、计算机系统及配套设施组成.  相似文献   

Thermodynamic conditions of framework grain dissolution of clastic rocks and its application in Kela 2 gas field   总被引：2，自引：2，他引：2  

LAI Xingyun  YU Bingsong  CHEN Junyuan  CHEN Xiaolin  LIU Jianqing  MEI Mingxiang  JING Weiguang & CHENG Suhua School of Earth Sciences  Mineral Resources  China University of Geosciences  Beijing  China  Key Laboratory of Lithospheric Tectonics  Deep-level Process  Exploration of Ministry of Education  Beijing  China 《中国科学D辑(英文版)》2005,48(1):21-31

Feldspar and clastic debris are the most important constituent framework grains of sedimentary clastic rocks and their chemical dissolution plays an essential role in the formation and evolution of the secondary pore in the reservoir rocks. On the basis of thermodynamic phase equilibrium, this study investigates the chemical equilibrium relationships between fluid and various plagioclase and K-feldspar in diagenesis of the sediments, particularly, the impact of temperature and fluid compositions (pH, activity of K+, Na+, Ca2+ and so on) on precipitation and dissolution equilibria of feldspars. Feldspar is extremely easily dissolved in the acid pore water with a low salinity when temperature decreases. The dissolution of anorthite end-member of plagioclase is related to the Ca content of the mineral and the fluid, higher Ca either in the mineral or in the fluid, easier dissolution of the feldspar. Moreover, the dissolution of albite end-member of plagioclase is related to Na of both the mineral and fluid,  相似文献