Synthetic seismic source location using a 2D time reversal implementation

@inproceedings{RENAT_RM2020,
 abstract = { Time-reversal allows us locating earthquakes by back-propagating seismic waveforms recorded at a set of receivers in depth. Doing so, the seismic energy focuses, pointing out the actual seismic source. Interestingly, this method can handle noisy recordings and complex geological settings. From a theoretical point of view, it requires the receivers to form a closed surface at depth, known as time-reversal mirror. Obviously, this condition cannot be satisfied in practice, but this is not our purpose to discuss this limitation here. Placing ourselves in the ideal framework, we implement a perfect time-reversal mirror to study the effects of the two force-terms which generate the back-propagated wavefield. One force-term is the traction at the mirror; the other is a dipole derived from the displacement at the mirror. The implementation of these two terms is performed in SpecFEM2d. We show that the two force-terms are not necessary to genereate the wavefield. With only one, the wavefield still focuses but also moves appart outside the closed surface. This result is encouraging because the traction is difficult to measure in practice. },
 author = { Renat, Zoé AND Caumon, Guillaume AND Cupillard, Paul },
 booktitle = { 2020 RING Meeting },
 publisher = { ASGA },
 title = { Synthetic seismic source location using a 2D time reversal implementation },
 year = { 2020 }
}