[MTT50-03] Surface-wave dispersion spectrum inversion method applied to Love and Rayleigh waves recorded by DAS
We propose to invert surface-wave dispersion spectra instead of dispersion curves. This inversion method can use mixed Rayleigh and Love waves recorded by DAS, even when the source and receiver array are not aligned. The new method not only improves the flexibility of the acquisition system design, but the Love wave data also provide additional constraints on the inversion. Our method is applied to active source and ambient noise datasets acquired at a geothermal site, providing consistent results for different datasets and acquisition geometries. The sensitivity of the data to layer thickness, density, and Vp are also discussed. Our method extends the usefulness of DAS datasets and improves data constraints that help to construct higher resolution models in practice.