scholarly journals Disturbance of SH-type waves due to moving stress discontinuity in an anisotropic soil layer overlying an inhomogeneous elastic half-space

Sadhana ◽  
2014 ◽  
Vol 39 (2) ◽  
pp. 451-465 ◽  
Author(s):  
D MANDAL ◽  
P C PAL ◽  
S KUMAR
Keyword(s):  
Half Space ◽  
Soil Layer ◽  
Elastic Half Space ◽  
Anisotropic Soil ◽  
Stress Discontinuity

Seismic waves from a horizontal stress discontinuity in a layered solid

1982 ◽  
Vol 72 (5) ◽  
pp. 1483-1498
Author(s):  
F. Abramovici ◽  
E. R. Kanasewich ◽  
P. G. Kelamis
Keyword(s):  
Half Space ◽  
Seismic Waves ◽  
Horizontal Stress ◽  
Radial Component ◽  
Elastic Half Space ◽  
Homogeneous Layer ◽  
Approximate Methods ◽  
Crustal Layer ◽  
Finite Fault ◽  
Stress Discontinuity

abstract The displacement components for a horizontal stress discontinuity along a buried finite fault in an elastic homogeneous layer on top of an elastic half-space are given analytically in terms of generalized rays. For a particular case of a concentrated horizontal force pointing in an arbitrary direction, detailed time-dependent expressions are given. For a simple model of a “crustal” layer over a “mantle” half-space, the numerical seismograms in the near- and intermediate-field show some interesting features. These include a prominent group of compressional waves whose radial component is substantial at distances four times the crustal thickness. All the dominant shear arrivals (s, SS, and sSS) are important and show large variations of amplitude as the source depth and receiver distance are varied. Some of the prominent individual generalized rays are shown, and it is found that they can be grouped naturally into families based on the number of interactions with the boundaries. The subdivision into individual generalized rays is useful for analysis and for checks on the numerical stability of the synthetic seismograms. Since the solution is analytic and the numerical evaluation is complete up to any desired time, the results are useful in comparing other approximate methods for the computation of seismograms.

An Explanation on Mechanism of Local Amplification in Attenuation of Ground Vibration from Rail Traffic in Urban Area

2012 ◽  
Vol 226-228 ◽  
pp. 392-395 ◽  
Author(s):  
Hai Ming Liu ◽  
Xia Xin Tao ◽  
Xin Zheng ◽  
Fu Tong Wang
Keyword(s):  
Half Space ◽  
Damping Ratio ◽  
Soil Layer ◽  
Ground Vibration ◽  
Elastic Half Space ◽  
Soil Layers ◽  
Urban Rail ◽  
Vertical Vibrations ◽  
Refracted Waves ◽  
Rail Traffic

The mechanism of local amplifying on attenuation of ground vibration from urban rail traffic is deal with by Zheng et al (2011). The vertical vibrations on ground points of a model with single soil layer overlaid on elastic half-space is calculated with transfer matrix method in frequency domain. The results show that the amplification could be simulated well by the calculation, and the location and degree of the amplification are governed by the ratio between shear modulus of the the overburden layer and the half space , the thickness and damping ratio of soil layers. It is further pointed out in this paper that the most significant factor is the impedance ratio at the buried velocity interface. Then the mechanics is explained as the meeting of the directly arriving surface wave and the reflected and refracted waves from the interface.

The efficiency of application of virtual cross-sections method and hypotheses MELS in problems of wave signal propagation in elastic waveguides with rough surfaces

2016 ◽  
pp. 3564-3575 ◽  
Author(s):  
Ara Sergey Avetisyan
Keyword(s):  
Half Space ◽  
Cross Sections ◽  
Classical Method ◽  
Signal Propagation ◽  
Elastic Half Space ◽  
Layered Systems ◽  
Surface Layers ◽  
Inhomogeneous Surface ◽  
Wave Signal ◽  
The Impact

The efficiency of virtual cross sections method and MELS (Magneto Elastic Layered Systems) hypotheses application is shown on model problem about distribution of wave field in thin surface layers of waveguide when plane wave signal is propagating in it. The impact of surface non-smoothness on characteristics of propagation of high-frequency horizontally polarized wave signal in isotropic elastic half-space is studied. It is shown that the non-smoothness leads to strong distortion of the wave signal over the waveguide thickness and along wave signal propagation direction as well.  Numerical comparative analysis of change in amplitude and phase characteristics of obtained wave fields against roughness of weakly inhomogeneous surface of homogeneous elastic half-space surface is done by classical method and by proposed approach for different kind of non-smoothness.

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