We present a new and efficient method to measure Rayleigh‐ and Love‐wave group velocity over a broad frequency range. This technique starts in a similar fashion to the traditional frequency‐time analysis, but instead of making measurements for all frequencies for a single source–station pair, we apply cluster analysis to make measurements for all recordings from a single event at a single target frequency. We also develop an inversion method with laterally varying smoothnesses to generate 2D group velocity maps with uniform errors. These maps match large scale geologic features and fit our data very well. This dataset will be used to constrain lithospheric structure globally.

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