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seismic modelling of tracked-vehicle signals for monitoring and verifi cation

Applied Geophysics 2021年第2期18卷 252-263,274页

作者： Mathias Pilch Jürgen Altmann Experimentelle PhyskⅢ TU Dortmund University44221 DortmundGermany

To better understand characteristics of seismic signals of tracked vehicles measured when passing a sensor line,we numerically modelled force-pulse responses of a layered soil that is similar in its seismic properties to that found at the original measurement *** vertical-force pulses from the road wheels rolling over the track elements are fitted to the measured ***-pulse seismic waves vary with distance due to diff erent wave types,refl ections at layer boundaries,vehicle velocity and relative position of the left and right track *** are computed by a modelling program and superposed at sensor positions with the appropriate slant distance and time shift for each track *** sum signals are in qualitative agreement with those from the original ***,they are several magnitudes weaker and much ***,higher frequencies are damped much less at larger *** to the large variability of the sum signals,recognition of tracked-vehicle types exclusively through their seismic signals seems diffi cult.

关键词： seismic modelling seismic classification tracked vehicles monitoring verifi cation

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Parallel 3-D simulation of seismic wave propagation nheterogeneous anisotropic media:a grid method approach

Parallel 3-D simulation of seismic wave propagation nheterog...

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中国科学院地质与地球物理研究所2006学术年会

作者： Hongwei Gao and Jianfeng Zhang Institute of Geology and Geophysics,State Key Laboratory of Lithosphere Evolution, Chinese Academy of Sciences,Beijing 100029,China.

This paper presents a parallel numerical technique for modelling wave propagation in 3-D heterogeneous anisotropic *** scheme is developed by following a so-called 3-D grid method of the elastic-isotropic *** proposed parallel algorithm needs small data exchanges between subdomains in contrast to that developed based on other numerical techniques;therefore, it is more suitable for a *** algorithm is implemented on a mesh of mixed tetrahedrons and parallelepipedons,thus providing an accurate description of arbitrary 3-D surface and interface topographies and an easy generation of a non-uniform,unstructured *** unstructured mesh means that the proposed algorithm can reduce the memory requirement by flexibly assigning small grid spacing in regions with lowvelocities and larger grid spacing in regions with higher *** the 3-D grid method,the resulting anisotropic scheme naturally satisfies the free-surface boundary conditions of arbitrary surface *** a result, the near-surface scattering effects can be more accurately *** proposed scheme can handle a general anisotropy without any *** this paper,the transversely isotropic medium with a tilted symmetry axis,as typically caused by a system of parallel cracks or fine layers,is discussed in detail.A paraxial absorbing boundary condition in a 3-D general anisotropic case is also *** with analytical solutions demonstrate the accuracy of the parallel *** 3-D radiation patterns illustrate shear-wave splitting,as predicted by the *** show the generality and flexibility of the algorithm by modelling wave propagation in an anisotropic half-space with a hemispherical crater on the surface and in mixed isotropic/anisotropic models with horizontal and inclined interfaces.

关键词： numerical techniques seismic anisotropy seismic modelling synthetic seismograms seismic wave propagation topography

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