Many efforts of geophysical processing have traditionally been devoted to the separation, attenuation, and elimination of noise from seismic acquisition data. However, one geophysicist’s noise is another geophysicist’s signal. Aki (1957) formulated the spatial autocorrelation method, which became a widely used tool in site investigations for determining surface-wave phase velocities from microtremors. Later, Claerbout (1968) proposed to correlate passive seismic recordings to simulate seismic reflection data.

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Since the early 2000s, noise crosscorrelations have revolutionized the way global seismologists probe the earth’s interior. Crosscorrelations of seismic noise yield body and surface-wave traveltimes that are routinely used to image the earth’s crust...

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