Magnitude estimation for microseismic events is critical to microseismic mapping of hydraulic fracture stimulation, discrete fracture network (DFN) modeling, as well as accurate estimated stimulated rock volume (SRV). We estimate magnitudes of microseismic events based on the mean peak ground velocity (PGV) calibrated by a moment magnitude from moment tensor inversion of the calibrated event. For over 500 microseismic events recorded using a surface array and 260 events recorded using a near-surface (receivers buried at an approximate depth of 100m) array, the square of the correlation coefficient (R2) values are ≥0.95 between moment magnitudes and calibrated magnitudes based on mean PGV values. The high coefficient values suggest that reliable magnitude estimations for detected events from surface or near surface observations are obtainable.


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