Broad-band synthetic seismograms for a spherical inhomogeneity in a many-layered elastic half-space     

Anders Boström  ers Karlsson 《Geophysical Journal International》1987,89(2):527-547

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Sp phases from the Australian upper mantle     

Günter Bock 《Geophysical Journal International》1988,94(1):73-81

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Multi-Source, Multi-Receiver Synthetic Seismograms For Laterally Heterogeneous Media Using F-K Domain Propagators   总被引：1，自引：0，他引：1  

A. J. Haines 《Geophysical Journal International》1988,95(2):237-260

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Computation of body-wave seismograms in absorbing 2-D media using the Gaussian beam method: comparison with exact methods   总被引：1，自引：0，他引：1  

Michael Weber 《Geophysical Journal International》1988,92(1):9-24

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Waveform modelling using locked-mode synthetic and differential seismograms: application to determination of the structure of Mexico     

Joan S. Gomberg  T. Guy Masters† 《Geophysical Journal International》1988,94(2):193-218

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Regional m_b:M_s, Lg/Pg amplitude ratios and Lg spectral ratios as criteria for distinguishing between earthquakes and explosions: a theoretical study     

R. C. Lilwall 《Geophysical Journal International》1988,93(1):137-147

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理论地理学的内涵认知   总被引：7，自引：1，他引：6  

牛文元 《地理研究》1988,7(1):1-11

本文从理论地理学的科学地位出发,介绍了近代理论地理学发展过程中形成的一些主要观点和其所具备的特点,最后对理论地理学的基本内容进行了归纳。  相似文献   

Neo-deterministic definition of seismic input for residential seismically isolated buildings   总被引：1，自引：1，他引：0  

Elisa Zuccolo  Franco Vaccari  Antonella Peresan  Alberto Dusi  Alessandro Martelli  Giuliano F. Panza   《Engineering Geology》2008,101(3-4):89-95

This paper deals with the neo-deterministic definition of the seismic input in the municipality of Nimis (Italy), aimed at the design of residential seismically isolated buildings. The seismic input is defined by the computation of realistic synthetic seismograms considering different levels of detail for the earthquake source, both for a bedrock model and taking into account the specific site conditions. The horizontal response spectrum, calculated in the centre of the municipality by modelling the most dangerous source, advises against the construction of a building with a fixed base, but it is compatible with the seismic isolation, and it has been, therefore, used for the design of a residential seismically isolated building. The maximum displacement for the isolation system has been estimated about 17 cm, a value much lower than that provided by the code design response spectrum (28 cm). The importance of the realistic modelling, which permits the generalization of empirical observations by means of, physically sound, theoretical considerations, is evident, as it allows for the optimisation of the structural design with respect to the site of interest.  相似文献   

Box fractal dimension as a measure of statistical homogeneity of jointed rock masses   总被引：2，自引：0，他引：2  

Pinnaduwa H. S. W. Kulatilake  Reno Fiedler  Bibhuti B. Panda 《Engineering Geology》1997,48(3-4):217-229

A written computer programme to estimate the box fractal dimension (D_B) is verified by estimating D_B of the triadic Koch curve for which the theoretical D is known. The influence of a number of input parameters of the box-counting method on the accuracy of estimated D_B is evaluated using the same Koch curve. The employed size range of the applied box networks was found to be the parameter which has the strongest influence on the accuracy of estimated D_B. This indicated the importance of finding the range of self-similarity or self-affinity for the object considered to select the proper range for the box sizes and, in turn, to obtain accurate estimates of D_B. By calculating D_B for different block sizes sampled from three generated two-dimensional joint patterns, it is shown that D_B can capture the combined effect of joint-size distribution and joint density on the statistical homogeneity of rock masses. The spatial variation of D_B along a 350 m stretch of a tunnel in the shiplock area of the Three Gorges dam site is computed using the joint data mapped on the walls and the roof of the tunnel. This spatial variation of D_B is used, along with the visual geological evaluation of the joint trace maps of the tunnel, in making decisions about statistical homogeneity of the rock mass around the tunnel. The results obtained on statistically homogeneous regions were found to be quite similar to the results obtained from a previous statistical homogeneity investigation which incorporated the effect of number of joint sets and their orientation distributions, but not the spatial variation of D_B. It is recommended that the spatial variation of D_B is used, along with the results of other methods such as contingency table analysis and equal area plots, which incorporate the effect of joint orientation distribution, in addition to the geology of the site, in determining the statistically homogeneous regions of jointed rock masses.  相似文献   

Elastic-wave velocities for porous media with power-law distribution of pore sizes     

M. Kupková  M. Kupka 《International Journal of Earth Sciences》1997,86(1):156-159

 A system consisting of an elastic matrix with randomly distributed pores of uniform shapes but with sizes governed by a power-law distribution is investigated in a theoretical way. The velocities of elastic waves propagating through such a system are calculated. The obtained results are that the velocities decrease with increasing total porosity and for a given porosity velocities moderately decrease with increasing absolute value of the exponent D in a power-law distribution of pore sizes. Received: 3 July 1995 / Accepted: 2 August 1996  相似文献