This is a Preprint and has not been peer reviewed. This is version 1 of this Preprint.
Downloads
Authors
Abstract
Rayleigh waves are prevalent in the ambient seismic noise wavefield and
are thus often exploited in passive seismic methods to characterise the near
subsurface. In fractured or faulted media, Rayleigh waves show azimuthal
anisotropy that could provide information on the fault properties. However,
the exact relationship between Rayleigh wave anisotropy and true anisotropic
structures is not well known. This study used a three-component (3C) beam-
forming toolbox to analyse numerical full waveform seismic wave propagation
from conceptual models of fractured media. We identify Rayleigh waves in
the synthetic data, compare observed Rayleigh wave anisotropy to structural
anisotropy, and assess the effect array design and source locations have on
Rayleigh wave analysis and observed anisotropy. Numerical analysis shows
that the smaller the velocity contrast between fault and surrounding rock,
the more complex the anisotropic response. We find that the slow directions
of Rayleigh wave propagation can be a better indicator of fault strike than
the fastest direction, when the velocity contrast between the two media are
small.
DOI
https://doi.org/10.31223/X5DD7X
Subjects
Physical Sciences and Mathematics
Keywords
numerical modelling, fractured media, Three-component beamforming, geothermal application, Rayleigh wave anisotropy, fractured media, Three-component beamforming, geothermal application, Rayleigh wave anisotropy
Dates
Published: 2024-09-03 14:07
Last Updated: 2024-09-03 18:07
License
CC BY Attribution 4.0 International
Additional Metadata
Conflict of interest statement:
None
There are no comments or no comments have been made public for this article.