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A seismic time reversal experiment based on Time Reversal Mirror (TRM)technique was conducted in the mesoscopically scaled medium at the LSBBLaboratory, France. Two sets of 50 Hz geophones were distributed at one meterintervals in two horizontal and parallel galleries 100 m apart, buried 250 mbelow the surface. The shot source used was a 4 kg sledgehammer. Analysis showsthat elastic seismic energy is refocused in space and time to the shotlocations with good accuracy. The refocusing ability of seismic energy to theshot locations is roughly achieved for the direct field, and with excellentquality, for the early and later coda. Hyper-focussing is achieved at the shotpoints as a consequence of the fine scale randomly heterogeneous medium betweenthe galleries. TRM experiment is sensitive to the roughness of the mirror used.Roughness induces a slight experimental discrepancy between recording andre-emitting directions degrading the quality of the reversal process.

Elastic Time Reversal Mirror Experiment in a Mesoscopic Natural Medium at the Low Noise Underground Laboratory of Rustrel, France