Broad-band Rayleigh wave phase velocity maps (10-150 s) across the United States from ambient noise data

In this study, we demonstrate the feasibility of imaging broad-band (10-150 s) Rayleigh wave phase velocity maps on a continental scale using ambient noise tomography (ANT). We obtain broad-band Rayleigh waves from cross-correlations of ambient noise data between all station pairs of USArray and measure the dispersion curves from these cross-correlations at a period band of 10-150 s. The large-scale dense USArray enables us to obtain over 500 000 surface wave paths which cover the contiguous United States densely. Using these paths, we generate Rayleigh wave phase velocity maps at 10-150 s periods. Our phase velocity maps are similar to other reported phase velocity maps based on ambient noise data at short periods (< 50 s) and based on earthquake data at intermediate/long periods (50-90 s). This study extends ANT from short/intermediate periods (< 50 s) to long periods up to 150 s in a continental scale of the USA. These broad-band phase velocity maps from ANT can be used to construct 3-D lithospheric and asthenospheric velocity structures.