Coalescence microseismic mapping (CMM) is an established technique used for real-time detection and localization of microseismic events (Drew et al., 2005). It has historically been used for hydraulic fracture monitoring (HFM) where there is a downhole array located in a monitoring well. This paper presents a variation of CMM which is adapted for weak signals and its application to hydraulic fracture monitoring conducted using a surface seismic array. Data from a multi-well, multi-stage stimulation in the Marcellus Shale concurrently monitored using a surface array and a downhole array illustrate the effectiveness of this adapted CMM algorithm.


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