Spatial variations in seismic motions

1976 ◽  
Vol 3 (1) ◽  
pp. 32-46
Author(s):  
G. P. Nair ◽  
J. J. Emery
Keyword(s):  
Rayleigh Wave ◽  
Epicentral Distance ◽  
Soil Layer ◽  
Focal Depth ◽  
Spatial Variations ◽  
Angle Of Incidence ◽  
Layer System ◽  
Wave Amplification ◽  
Wave Phase Velocity ◽  
Rayleigh Wave Phase Velocity

A method for evaluating the spatial variations in strong seismic motions for a linear, homogeneous, and horizontally stratified soil layer system is presented. The procedure accounts for the focal depth and the epicentral distance, the corresponding angle of incidence, and the relative contributions of both shear and Rayleigh waves. The inclined propagation of shear waves is studied using the multiple reflection refraction theory. The range of possible values of Rayleigh wave phase velocity in the soil layer system is determined, and using an averaging procedure the Rayleigh wave amplification factors are computed. The influences of various factors on the spatial variations in seismic response are discussed. The method is general so that it can be used for various problems involving spatial motion computations. The application of the method in computing the responses of a soil–pile system is described and some typical results given.

scholarly journals Direct estimation of the Rayleigh wave phase velocity in microtremors

2006 ◽  
Vol 33 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Hidetaka Shiraishi ◽  
Tatsuro Matsuoka ◽  
Hiroshi Asanuma
Keyword(s):  
Phase Velocity ◽  
Rayleigh Wave ◽  
Direct Estimation ◽  
Wave Phase ◽  
Wave Phase Velocity ◽  
Rayleigh Wave Phase Velocity

scholarly journals Rayleigh wave phase velocity analysis of the Ross Sea, Transantarctic Mountains, and East Antarctica from a temporary seismograph array

2006 ◽  
Vol 111 (B6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jesse F. Lawrence ◽  
Douglas A. Wiens ◽  
Andrew A. Nyblade ◽  
Sridhar Anandakrishnan ◽  
Patrick J. Shore ◽  
...  
Keyword(s):  
Phase Velocity ◽  
Rayleigh Wave ◽  
Ross Sea ◽  
East Antarctica ◽  
Velocity Analysis ◽  
Wave Phase ◽  
Wave Phase Velocity ◽  
Transantarctic Mountains ◽  
Rayleigh Wave Phase Velocity

scholarly journals Deformation of the Crust and Upper Mantle beneath the North China Craton and Its Adjacent Areas Constrained by Rayleigh Wave Phase Velocity and Azimuthal Anisotropy

2021 ◽  
Vol 14 (1) ◽  
pp. 110
Author(s):  
Xiaoming Xu ◽  
Dazhou Zhang ◽  
Xiang Huang ◽  
Xiaoman Cao
Keyword(s):  
Phase Velocity ◽  
Rayleigh Wave ◽  
Azimuthal Anisotropy ◽  
The Tibetan Plateau ◽  
Low Velocity ◽  
Crust And Upper Mantle ◽  
Fast Axis ◽  
Wave Phase ◽  
Wave Phase Velocity ◽  
Rayleigh Wave Phase Velocity

The North China Craton (NCC) has experienced strong tectonic deformation and lithospheric thinning since the Cenozoic. To better constrain the geodynamic processes and mechanisms of the lithospheric deformation, we used a linear damped least squares method to invert simultaneously Rayleigh wave phase velocity and azimuthal anisotropy at periods of 10–80 s with teleseismic data recorded by 388 permanent stations in the NCC and its adjacent areas. The results reveal that the anomalies of Rayleigh wave phase velocity and azimuthal anisotropy are in good agreement with the tectonic domains in the study area. Low-phase velocities appear in the rift grabens and sedimentary basins at short periods. A rotation pattern of the fast axis direction of the Rayleigh wave together with a distinct low-velocity anomaly occurs around the Datong volcano. A NW–SE trending azimuthal anisotropy and a low-velocity anomaly at periods of 60–80 s are observed subparallel to the Zhangbo fault zone. The whole lithosphere domain of the Ordos block shows a high-phase velocity and counterclockwise rotated fast axis. The northeastern margin of the Tibetan plateau is dominated by a low-velocity and coherent NW–SE fast axis direction. We infer that the subduction of the Paleo-Pacific plate and eastward material escape of the Tibetan plateau mainly contribute to the deformation of the crust and upper mantle in the NCC.

Rayleigh wave phase velocity models for gravitational wave detectors using an array of nodal sensors

First Break ◽  
2017 ◽  
Vol 35 (6) ◽  
Author(s):  
Soumen Koley ◽  
Henk Jan Bulten ◽  
Jo van den Brand ◽  
Maria Bader ◽  
Xander Campman ◽  
...  
Keyword(s):  
Phase Velocity ◽  
Rayleigh Wave ◽  
Gravitational Wave ◽  
Velocity Models ◽  
Wave Phase ◽  
Wave Phase Velocity ◽  
Gravitational Wave Detectors ◽  
Rayleigh Wave Phase Velocity
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