An Educational Animation of the Propagation of Earthquake-Generated Seismic Shear Waves Across the Mantle

2002 ◽  
Vol 50 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Michael E. Wysession ◽  
Saadia Baker
Keyword(s):  
Shear Waves ◽  
Seismic Shear

scholarly journals Effects of Underground Cavities on the Frequency Spectrum of Seismic Shear Waves

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
G. Lancioni ◽  
R. Bernetti ◽  
E. Quagliarini ◽  
L. Tonti
Keyword(s):  
Frequency Spectrum ◽  
Ad Hoc ◽  
Parametric Design ◽  
Shear Waves ◽  
Scattering Problem ◽  
Ground Surface ◽  
Ground Level ◽  
Seismic Shear ◽  
Underground Cavities ◽  
Free Wave Propagation

A numerical method is proposed to study the scattering of seismic shear waves induced by the presence of underground cavities in homogeneous soils. The method is based on the superposition of two solutions: the solution of the free-wave propagation problem in a uniform half-space, easily determined analytically, and the solution of the wave scattering problem due to the cave presence, evaluated numerically by means of an ad hoc code implemented by using the ANSYS Parametric Design Language. In the two-dimensional setting, this technique is applied to the case of a single cave, placed at a certain depth from the ground level. The frequency spectrum of the seismic shear oscillation on the ground surface is determined for different dimensions and depths of the cave and compared with the spectrum registered without caves. The influence of the cave dimensions and depth on the spectrum amplification is analyzed and discussed.

THE USE OF SEISMIC SHEAR WAVES AND COMPRESSIONAL WAVES FOR LITHOLOGICAL PROBLEMS OF SHALLOW SEDIMENTS*

1984 ◽  
Vol 32 (4) ◽  
pp. 662-675 ◽  
Author(s):  
H. STUMPEL ◽  
S. KAHLER ◽  
R. MEISSNER ◽  
B. MILKEREIT
Keyword(s):  
Shear Waves ◽  
Compressional Waves ◽  
Seismic Shear ◽  
Shallow Sediments

scholarly journals Seismic shear waves as Foucault pendulum

2016 ◽  
Vol 43 (6) ◽  
pp. 2576-2581 ◽  
Author(s):  
Roel Snieder ◽  
Christoph Sens‐Schönfelder ◽  
Elmer Ruigrok ◽  
Katsuhiko Shiomi
Keyword(s):  
Shear Waves ◽  
Foucault Pendulum ◽  
Seismic Shear

Seismic Shear Waves in Engineering

1974 ◽  
Vol 100 (8) ◽  
pp. 905-923
Author(s):  
Harold M. Mooney
Keyword(s):  
Shear Waves ◽  
Seismic Shear

Reflection seismology over azimuthally anisotropic media

Geophysics ◽  
1988 ◽  
Vol 53 (3) ◽  
pp. 304-313 ◽  
Author(s):  
Leon Thomsen
Keyword(s):  
Field Data ◽  
Shear Waves ◽  
Azimuthal Anisotropy ◽  
Reflection Seismology ◽  
Reflection Amplitude ◽  
Seismic Shear ◽  
Fracture Intensity ◽  
Survey Line ◽  
Vsp Data ◽  
High Vertical Resolution

Recent surveys have shown that azimuthal anisotropy (due most plausibly to aligned fractures) has an important effect on seismic shear waves. Previous work had discussed these effects on VSP data; the same effects are seen in surface recording of reflections at small to moderate angles of incidence. The anisotropic effects on different polarization components of vertically traveling shear waves permit the recognition and estimation of very small degrees of azimuthal anisotropy (of order ⩾1 percent), as in an interferometer. Anisotropic effects on traveltime yield estimates of anisotropy which are averages over large depth intervals. Often, raw field data must be corrected for these effects before the reflectors may be imaged; two variations of a rotational algorithm to determine the “principal time series” are derived. Anisotropic effects on moveout lead to abnormal moveout unless the survey line is parallel to the fractures. Anisotropic effects on reflection amplitude permit the recognition and estimation of anisotropy (hence fracture intensity) differences at the reflecting horizon, i.e., with high vertical resolution.

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