Generally, seismic interferometry refers to a method of extracting the wavefield responses between two receivers as if we had replaced one of those receivers by a source (van Manen et al., 2005; Wapenaar and Fokkema, 2006). This is done by a process of cross-correlation and summation of wavefields observed at those receivers. These recorded wavefields can be excited by active sources (earthquakes, dynamite, air guns, vibroseis, and others) or passive sources (oceanic microseisms, traffic on roads, industrial machinery, and others). When applying seismic interferometry using surface sources and surface receivers, the recovered inter-receiver response is dominated by surface waves. This phenomenon is observed in both global and regional seismology where passive seismic energy is used, and in exploration seismology, where active sources are used.

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