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We demonstrate a technique to enhance the ability of imaging the location of a microseismic event by improving both spatial and temporal focusing. The technique improves locating a microseismic event in a velocity model for which the interface boundaries are approximate but where it has the correct mean slowness. Our method designs a signal to be rebroadcasted from the receivers, using only the waves recorded at each receiver, such that the wave field has an optimal temporal focus at the source location. Additionally, this procedure leads to an improved spatial focus of the wave field. The numerical test shown include additive noise. This proposed technique only involves a simple preprocessing step to the recorded data and its cost is hence negligible compared to the total cost of microseismic imaging.

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