Correlation of near surface fractures with seismic radial anisotropy: An approach for near surface fracture identification

Laboratory Measurements of the Impact of Fracture and Fluid Properties on the Propagation of Krauklis Waves

“…Trad et al, 2003). This method has been used in surface wave studies to obtain the phase velocities of Rayleigh and Love waves (Jeng et al, 2020;Luo et al, 2009).…”

Rayleigh‐Love Discrepancy Highlights Temporal Changes in Near‐Surface Radial Anisotropy After the 2004 Great Sumatra Earthquake

“…It is also understood that strong anisotropy, either in the form of azimuthal anisotropy (L. W. Chen et al., 2017; T. Y. Huang et al., 2015; Mordret et al., 2013) or radial anisotropy (Jeng et al., 2020; Naghavi et al., 2019; Shirzad et al., 2017; Tomar et al., 2017) have been detected in the near surface. Typically, azimuthal anisotropy describes the azimuthal dependence of S ‐wave velocity (denoted as V S or β ) and particle motion within the horizontal plane, assuming a horizontal symmetry axis (i.e., horizontal transverse isotropy, abbreviated as “HTI”) (Crampin, 1975).…”

“…Early observations of the “Rayleigh‐Love discrepancy” typically referred to the fact that the phase (or group) velocity of Rayleigh and Love waves cannot be reconciled by a simple isotropic velocity model (Anderson, 1961; Babuska & Cara, 1991; Maupin & Cara, 1992), indicative of radial anisotropy. While crustal radial anisotropy was extensively investigated (Hu et al., 2020; H. Huang et al., 2010; Jaxybulatov et al., 2014; Moschetti et al., 2010; Shapiro et al., 2004), only a handful of studies investigated near‐surface radial anisotropy (Jeng et al., 2020; Shirzad et al., 2017; Tomar et al., 2017). To our knowledge, no reports documented key observations indicative of changes in radial anisotropy in the near surface.…”

“…While crustal radial anisotropy was extensively investigated (Hu et al, 2020;H. Huang et al, 2010;Jaxybulatov et al, 2014;Moschetti et al, 2010;Shapiro et al, 2004), only a handful of studies investigated near-surface radial anisotropy (Jeng et al, 2020;Shirzad et al, 2017;Tomar et al, 2017). To our knowledge, no reports documented key observations indicative of changes in radial anisotropy in the near surface.…”

Physical Modeling of the Krauklis Waves: Insights From Two Experimental Apparatuses

“…To obtain the phase velocity of the Krauklis wave, we utilized the high-resolution linear Radon transform (HRLRT), which is advantageous over the conventional transformations such as the phase shift method (Park et al, 1998) as it provides a higher resolution of dispersion curve images particularly when there is a limited number of traces (Trad et al, 2003). This method has been used in surface wave studies to obtain the phase velocities of Rayleigh and Love waves (Jeng et al, 2020).…”