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Abstract

In a migration-based approach used for detection and location of weak microseismic activity, a key issue to look at is the expected focusing pattern of the network, with respect to a given velocity model and according to selected phases (e.g., first arrivals). Such focusing patterns can be estimated by so-called Point-Spread Functions (PSFs), as adapted from similar technology used in active seismic. The PSFs will represent the 3D spatial resolution of the location problem, independently of any data and their errors. It can thus be used prior to any recording, to design the most optimal network, then during recording to better analyse the location of the measured seismicity. PSFs are very efficiently estimated by ray-based methods or similar (e.g., eikonal solvers), this also in a flexible manner allowing playing with many parameters. It could also help setting the parameters of the migration-based location process itself.