Seismic waves propagating through the earth's interior are important tools to study earth structure. Recently, large-scale seismic array deployments have promoted the development of new data analysis methods. Surface-wave tomography, which uses surface waves to determine crustal and upper mantle structure, and seismic interferometry, which extracts waves traveling between two stations by cross-correlating long duration noise signals, are among the many exciting research areas. In this presentation, I will demonstrate how high-resolution surface-wave phase velocity, amplification, and ellipticity maps can be determined based on array analysis and used to constrain crust and upper mantle velocity, anisotropy, attenuation, and density structure. Moreover, I will show how both surface waves and deep-propagating body waves, particularly core phases, can be extracted from seismic noise based on seismic interferometry. The application of seismic tomography and interferometry using USArray and various other regional arrays will be discussed, which reveals detailed earth structure that can be associated with surface geological features, plate tectonics, and core formation.
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