Source-receiver seismic interferometry

Seismic (or more generally, wavefield) interferometry allows receivers to assume the role of sources, or vice versa. Recorded waveforms (theoretically, Green's functions) can be constructed from new ‘virtual’ source positions at which only receivers have been physically located. To-date, however, forms of interferometry have only been derived to provide inter-receiver or inter-source Green's functions. For the first time we derive a form of interferometry that provides Green's functions on real-source to real-receiver paths, using only energy that has propagated from surrounding sources or to surrounding receivers. This allows various useful interferometric methods to be applied to (more conventional) source-receiver configurations for the first time.