A stochastic approach to model bottom boundary conditions and compute efficiency in a settling tank     

J. Ph. Chancelier  M. Cohen de Lara  F. Pacard 《Stochastic Environmental Research and Risk Assessment (SERRA)》1997,11(6):449-457

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Study on crust-mantle tectonics and its velocity structure along the Beijing-Huailai-Fengzhen profile   总被引：2，自引：0，他引：2  

祝治平  张先康  张建狮  张成科  赵金仁  徐朝凡 《地震学报(英文版)》1997,10(5):615-623

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喜马拉雅和青藏高原深剖面研究的进展   总被引：1，自引：0，他引：1       下载免费PDF全文

赵文津  黄立言  熊嘉育 《地球物理学报》1997,40(Z1):140-152

概述了1992─1996年中、美、德合作开展“喜马拉雅和青藏高原深剖面及综合研究”的主要进展，包括研究项目的提出、工作进展概况和取得的主要科学、技术成果；并对今后的工作提出了建议．  相似文献   

低应变反射波法桩基完整性检测波形分析   总被引：1，自引：0，他引：1  

曹俊昌 《华东地质学院学报》1997,20(4):358-361

本文简述了反射波法检测波形的分析方法，并通过工程实例说明其应用效果。  相似文献   

X射线管辐射谱线分析   总被引：1，自引：0，他引：1  

宓锦校  沈今川 《矿物学报》1997,17(2):164-168

经Ni滤波片过滤的CuKa射线，并非为真正的单色X射线，其中含部分白色X射线和非CuKa特征谱线。用石英分析晶体（101）衍射面网将混入CuKa射线中的各种波长的谱线分离开，并测定其波长的范围，确定在CuKa射线中含有铁、镍、钴、铬四种元素的K系列谱线和钨的L系列谱线。发现在X射线粉末图谱中用CuKa（或Kβ）无法解释的弱衍射线却是由铁、镍等元素的特征谱线混入引起的。  相似文献   

地震反射层析成像方法的研究及其在工程中的应用     

田宗勇  吴建成  刘家琦  喻振华 《物探与化探》1997,21(5):394-398

本文提出的地震反射层析成像方法,基于射线原理,应用叠前反射波的走时资料,逐层反演地下介质结构。它是在局部范围内,将地层各界面视为平面,求取界面、速度参数,全剖面的成像只需反复进行局部反演。用该方法处理了三板溪水电站工区的两个地震剖面,处理结果与钻孔资料对比,一致性较好。  相似文献   

Kirchhoff synthetics for seismic reflections and diving waves in two dimensions and application to the D" layer     

Jürgen Neuberg  Leonard Lisapaly 《Geophysical Journal International》1997,129(3):587-596

The Kirchhoff-Helmholtz (KH) integration has been used to model the reflected and the diving waves from an interface with a positive velocity gradient. The modelling is carried out for a spherical boundary and for a sinusoidal topography with a long-scale wavelength.
An artefact, which is a major problem in modelling the seismic response using the KH integration, has been reduced by introducing a Hilbert transform sign manipulation. Cleaner synthetic seismograms with correct amplitudes have been produced by this method. A discretization in larger surface elements has been made possible by introducing a smoothing factor that suppresses the noise that normally follows the constructed signal if a large element size is taken.  相似文献   

Reweighting strategies in seismic deconvolution   总被引：2，自引：0，他引：2  

Mauricio D. Sacchi 《Geophysical Journal International》1997,129(3):651-656

Reweighting strategies have been widely used to diminish the influence of outliers in inverse problems. In a similar fashion, they can be used to design the regularization term that must be incorporated to solve an inverse problem successfully. Zero-order quadratic regularization, or damped least squares (pre-whitening) is a common procedure used to regularize the deconvolution problem. This procedure entails the definition of a constant damping term which is used to control the roughness of the deconvolved trace. In this paper I examine two different regularization criteria that lead to an algorithm where the damping term is adapted to successfully retrieve a broad-band reflectivity.
Synthetic and field data examples are used to illustrate the ability of the algorithm to deconvolve seismic traces.  相似文献   

The mean transmission properties of a fault with imperfect facial contact   总被引：1，自引：0，他引：1  

J. A. Hudson  Enru Liu  Stuart Crampin 《Geophysical Journal International》1997,129(3):720-726

A model of a fault where the two faces do not exactly conform is characterized by a distribution of approximately circular contacts; elsewhere, the faces are stress-free. This contrasts with most earlier models, which have assumed the contact geometry to be equivalent to a plane distribution of approximately circular cracks. The contact regions in the present model are taken to be sparsely distributed, and averaged interface conditions are derived that are accurate to second order. At lowest order they agree with established formulae for the normal stiffness of non-conforming surfaces. These averaged, or mean, conditions are expected to hold at wavelengths long compared with the radii and spacing distance of the contact points. Unsurprisingly, they are equivalent to the continuity conditions for a thin elastic layer whose properties are given here in terms of the parameters of the contact surface.  相似文献   

济源盆地下第三系济源群划分对比新认识     

王斌  王天佐 《地层学杂志》1995,19(4):264-273

以地震资料为主要依据进行了综合研究，完善了下第三系济源群的地层层序，将它重新划分为韩庄组、聂庄组、泽峪组、丁庄组和冢头组；纠正了以往钻井地层的错误对比，将济２井的济源群叠置于济３井的济源群之上；证实下第三系济源群的厚度不止３０００ｍ，最大厚度可能达８５００ｍ。  相似文献