We developed a method that enables computing focal mechanisms with only a few sensors. This method is based on a non-linear inversion of the P, SV and SH amplitudes of microseisms recorded on a set of sensors. Information brought by the focal mechanism enables determining the direction of the mechanism and the associated geological structure. Moreover, the computation of the mechanism enables a better estimate of the conventional source parameters. This full analysis has been performed on two microseismic clusters in the Arkema-Vauvert site in the south-East of France. Results of the focal mechanism study highlight that the two clusters are totally different in terms of source behaviour: one is characterized by the occurrence of the seismicity along an important identified thrust fault; the other is characterized by the reactivation of a well-known listric fault.


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