A method for inversion of layered shear wavespeed azimuthal anisotropy from Rayleigh wave dispersion using the Neighborhood Algorithm

Measurements of Shear-wave Azimuthal Anisotropy with Cross-dipole Logs

Three methods for analyzing azimuthal anisotropy from cross-dipole logs are applied to data from the Powder River Basin in Wyoming. These techniques are based on the phenomena of flexural wave splitting in anisotropic materials and are analogous to the techniques used for VSP data processing. The four-component cross-dipole logging data obtained with a Schumberger tool from a vertically-fractur...

On the relationship between azimuthal anisotropy from shear wave splitting and surface wave tomography

[1] Seismic anisotropy provides essential constraints on mantle dynamics and continental evolution. One particular question concerns the depth distribution and coherence of azimuthal anisotropy, which is key for understanding force transmission between the lithosphere and asthenosphere. Here, we reevaluate the degree of coherence between the predicted shear wave splitting derived from tomograph...

Comparison of Rayleigh wave dispersion relations from three surface wave measurements in a complex-layered system

Three widely-available surface wave measurement techniques, including two active-source methods, the Spectral Analysis of Surface Waves (SASW) method and the Multi-channel Analysis of Surface Waves (MASW) method, and one passive-source method, the Refraction Microtremor (ReMi) method, were applied at a complex-layered site. Dispersion relations were compared to one another. Outcomes from the MA...

Rayleigh Wave Dispersion Curve Inversion: Occam Versus the L1-Norm

Joint inversion of ReMi dispersion curves and refraction travel times using particle swarm optimization algorithm

Shear-wave velocity ( ) is an important parameter used for site characterization in geotechnical engineering. However, dispersion curve inversion is challenging for most inversion methods due to its high non-linearity and mix-determined trait. In order to overcome these problems, in this study, a joint inversion strategy is proposed based on the particle swarm optimization (PSO) algorithm. The ...