Processing Ambient Noise Data Using Phase Cross‐Correlation and Application Toward Understanding Spatiotemporal Environmental Effects

Abstract

Theoretical and experimental studies have shown that the empirical Green's functions (EGFs) can be extracted from cross-correlation of diffuse seismic wave-fields between station-pairs (

Ambient Seismic Noise Tomography Within the Floridan Aquifer System, Santa Fe River‐Sink Rise, Florida, US

“…Journal of Geophysical Research: Solid Earth 10.1029/2023JB027644 Additionally, we extend our analysis by performing an initial inversion of the network-wide array average group velocity curve after Woo et al (2023a), employing the evodcinv Python library (Luu, 2023). This process iteratively inverts the sensitivity kernel velocity model with the average group velocity curve, yielding a 1D shear wave velocity model as a function of depth (Figure S22 in Supporting Information S1).…”

“…Woo et al (2023a) provide further details on the data processing and dispersion measurement methodology described herein (Figure 2). We used the PCC and PS method after Woo et al (2023a) to estimate symmetrical station-pair empirical Green's functions. This method enables an amplitude-unbiased method of extracting phase-coherent signals (Schimmel, 1999;Schimmel et al, 2011;Woo et al, 2023a).…”

“…Seismic data collected are available through the IRIS Data Management Center under network code XS (https://doi.org/10.7914/SN/XS_2018; Bilek, 2018). The scripts required to reproduce the cross‐correlations, dispersion measurements, and the dispersion quality control for this material are available through the Zenodo Seismic Ambient Noise Measurement Repository (https://doi.org/10.5281/zenodo.7582572; Woo et al., 2023b). Additionally, the scripts to replicate the signal analysis and tomography, including complete results, are available through the Zenodo Seismic Ambient Noise Measurment Repository (https://doi.org/10.5281/zenodo.10944814; Gochenour et al., 2023).…”

“…We used the PCC and PS method after Woo et al (2023a) to estimate symmetrical station-pair empirical Green's functions. This method enables an amplitude-unbiased method of extracting phase-coherent signals (Schimmel, 1999;Schimmel et al, 2011;Woo et al, 2023a). PS is a non-linear method that weights the samples by the instantaneous phase (Schimmel & Paulssen, 1997;Schimmel et al, 2011;Woo et al, 2023a).…”

“…We employed these dispersion measurements in the subsequent inversion process to obtain 2D models of the subsurface velocity structure. Woo et al (2023a) provide further details on the data processing and dispersion measurement methodology described herein (Figure 2). We used the PCC and PS method after Woo et al (2023a) to estimate symmetrical station-pair empirical Green's functions.…”