盆地地史模拟述评   总被引：9，自引：0，他引：9  

叶加仁  陆明德 《地质科技情报》1995,14(2):45-51

论述了盆地地史模拟的一般研究方法，认为回剥法是现今重建盆地沉积史与构造史最精确的方法详细讨论了地坟实校正、不整合处理和构造沉隆分析等主要数学模型及其适用范围；并在介绍地史模拟研究历史和研究现状的基础上，指出了地史模拟的发展方向。  相似文献   

疏勒河断裂中段VLF响应特点及地质解释     

莫撼  熊章强 《华东地质学院学报》1995,18(3):249-251

疏勒河断裂带中段为一隐伏基底断裂。由于规模较大，并且充填了低阻的构造角砾岩，因此对ＶＬＦ有很好的响应。本文分析了该构造的ＶＬＦ响应特点，指出在本区用ＶＬＦ方法寻找隐伏构造的有效性和局限性。  相似文献   

Multispectral remote sensing of biomass burning in West Africa     

J. Ricardo  A. De França  J. -M. Brustet  J. Fontan 《Journal of Atmospheric Chemistry》1995,22(1-2):81-110

Remote sensing measurements provide a vauable means of determining the extent of burning areas and of estimating the overall distribution of pollutant sources (identified from experimental studies) in time and space. This distribution has to be taken into account in the boundary conditions of chemistry atmospheric models.Recent methods developed for the remote sensing of active fires in tropical or temperated forest zones, have been found to be completely inadequate for fire detection on West African savannas. In order to accurately estimate the active fire distribution in the function of different sorts of West African savannas (Sahelian, Sudanian and Guinean) and forests, a multispectral methodology has been developed based on NOAA/11-AVHRR satellite data, with the purpose of eliminating as much as possible the problems related to large surface heterogeneity, confusion and bias, produced by clouds, smoke, haze, background emissivities, etc.Unlike other methods, the results show that the multispectral method, in spite of its selectivity, provides realistic results, and does not under- or over-estimate the number of fires that can be sensed by the satellite. Consequently, this methodology is more appropriate than the simplest ones for a systematic sensing of this phenomenon.  相似文献   

夜间气象能见度的测量研究   总被引：3，自引：0，他引：3  

胡江华  周建勋 《南京气象学院学报》1995,18(4):584-587

运用能见度理论和双止偏光能见度测定仪原理，讨论了夜间气象能见度的测量原理和一种新的测量方法，并完成了初步的野外对比试验，得出了比较结论。  相似文献   

Investigation of electrical anisotropy in the deep borehole KTB     

Armin Rauen  Marcela Lastovickova 《Surveys in Geophysics》1995,16(1):37-46

Information about electrical anisotropy in and around the deep borehole of the German Continental Deep Drilling Program (KTB) has been acquired using three different methods: (1) Under surface temperature and pressure conditions, the azimuthal dependence of resistivity has been measured in horizontal planes perpendicular to the axes of drill cores. (2) Simulated in-situ conditions (high temperature and pressure) have been applied to mini cores drilled at different orientations to structural features such as foliation. The resistivity was then measured in the direction of the mini cores' long axes. (3) Under quasi-in-situ (downhole) conditions, the azimuthal dependence of resistivity has been measured in horizontal planes using the Azimuthal Resistivity Imager (ARI), a down hole logging tool.These investigations have shown that electrical anisotropy is strongly related to structural features. The anisotropy of gneisses is the highest due to the strong foliation (averaged anisotropy factor 2.8). Lamprophyres are most isotropic (factor 1.2). Most rocks from KTB are amphibolites with intermediate anisotropies (factor 1.3). The anisotropies measured under surface temperature and pressure conditions and quasi-in-situ conditions on amphibolites are approximately the same, whereas anisotropies under simulated in-situ conditions are partially higher.Furthermore, the anisotropies measured on the cm to m scale using the various methods outlined above shall be compared with large scale anisotropies of the km scale measured around KTB using Magneto Tellurics.  相似文献   

冬季平流层波动模型的分岔特性          下载免费PDF全文

胡雄  张训械  黄信榆 《地球物理学报》1995,(4)

从描述波流相互作用的Ｈｏｌｔｏｎ－Ｄｕｎｋｅｒｔｏｎ简称Ｈ－Ｄ）模型出发，应用延拓方法求解常微分方程的分岔问题，研究冬季平流层波动模型的分岔特性．给出了大气行星波２与流相互作用的底部边界强迫波、底部边界平均纬向风场、风切变等参数的分岔特性，同时给出了波１与流相互作用的底部边界强迫波的分岔特性的结果．  相似文献   

裂隙各向异性介质波场VSP多分量记录的数值模拟   总被引：5，自引：2，他引：5       下载免费PDF全文

牛滨华  何樵登 《地球物理学报》1995,38(4):519-527

从各向异性介质中最为普遍的裂隙各向异性介质出发，推导了同零井源距ＶＳＰ三分量观测方式相一致的一维三分量波动方程．为了更符合实际观测，引入了坐标旋转，可以模拟井中任意方位的多层各向异性介质的波场响应．用有限元方法进行了波场数值模拟，重点突出了获得凡Ｒ_３×３矩阵剖面的方法，同时对Ｒ_３×３，矩阵剖面进行了一般性的分析解释，事实证明，Ｒ_３×３矩阵剖面含有介质丰富的各向异性信息．  相似文献   

1911年红海湾6级地震前珠江三角洲及其邻区的区域构造应力场          下载免费PDF全文

孙荀英  黄新辉 《地球物理学报》1995,38(5):618-626

本文包括：（１）通过拟合区内断层错动方式确定区域边界上作用的远场构造应力；（２）根据发震前震中所在断层段要进入塑性状态，确定１９１１年红海湾地震前区内构造应力场．两个应力场均采用正交设计法与弹塑性有限元方法快捷地得到．结果表明：该区远场最大主压应力σ３的方向为Ｎ６８°Ｗ，σ３＝－２００ＭＰａ，最小主压应力σ１＝－８０ＭＰａ；算得的红海湾地震前区内应力场的特点是除滨海断裂的红海湾段已进入屈服状态外，其余断裂均处于弹性状态．  相似文献   

大地电磁一维连续介质反演的曲线对比法   总被引：13，自引：3，他引：13       下载免费PDF全文

徐世浙  刘斌 《地球物理学报》1995,38(5):676-682

根据电磁波的传播特性，把视电阻率随周期变化的曲线转化为电阻率随深度变化的曲线，并以此作为初始反演的地电模型．通过初始地电模型得到的视电阻率曲线与真实模型的视电阻率曲线的对比，对初始地电模型的电阻率值进行校正．校正后的反演模型的视电阻率曲线与真实模型的视电阻曲线的拟合程度有所提高．然后如此反复进行多次校正，获得与真实模型更为接近的反演模型，反演的拟合误差一般小于ｌ％．模型试验和实际例子表明，该方法的拟合程度优于Ｂｏｓｔｉｃｋ法．  相似文献   

华北地区人工地震测深震相与地壳结构研究   总被引：27，自引：1，他引：27  

嘉世旭  刘昌铨 《地震地质》1995,17(2):97-105

主要讨论了华北地区人工地震测深中的４个（Ｐ＿ｇ，Ｐ＿ｃ，Ｐ＿ｍ，Ｐ＿ｎ）常规震相以及它所反映的构造和物性特征，这些震相反映了地壳上地幔不同层位的构造形态以及速度和速度梯度结构在纵横向的变化。还重点研究了华北地区的奇异震相以及反映在构造上的特殊性和重要意义，一些剖面局部区域的某些震相显示在视速度、振幅和出现区间等方面的异常，反映了该区域在构造上的特殊性，而这些特殊性往往与地震的孕育、发生以及矿产资源的潜在构造背景有着密切的关系  相似文献