Recent advances in seismic methods use coherent signals, recorded at a pair of stations, to image the underlying structure without using earthquakes or explosions.
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Full waveform inversion (FWI) is a seismic imaging technique pioneered by Patrick Lailly and Albert Tarantola in the early 1980s.
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Passive Seismic Tomography (PST) is a technique developed in the early 80s by K. Aki and students at MIT to image the subsurface of the earth.
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