Phase-weighted slant stacking for surface wave dispersion measurement

SUMMARY Surface wave retrieval from ambient noise records using seismic interferometry techniques has been widely used for multiscale shear velocity (Vs) imaging. One key step during Vs imaging is the generation of dispersion spectra and extraction a reliable curve retrieved surface waves. However, sparse array geometry usually affects ability high-frequency (>1 Hz) signals’ acquisition. Dispersion measurements are degraded by response due to sampling often present smeared with sidelobe artefacts. Previous studies focus on interferograms’ domain (e.g. cross-correlation function) attempt enhance coherent signals before measurement. We propose an alternative technique explicitly deblur through use phase-weighted slant-stacking algorithm. Numerical examples demonstrate strength proposed attenuate responses as well incoherent noise. Three different field prove flexibility superiority technique: first data set consists acquired nodal seismometer array; second utilizes distributed acoustic sensing (DAS) marine fibre-optic cable acquire similar set; last vibrator-based active-source data. The enhanced provide cleaner higher-resolution without distortions which will assist both human interpreters ML algorithms in efficiently picking curves subsequent inversion.