A method for estimating a fluid pressure required to stimulate a subsurfaceformationincludes using seismic signals detected by a plurality of seismic sensorsdisposedproximate the subsurface formation. Spatial positions and times of origin("hypocenters")of each of a plurality of microseismic events induced by pumping fluid intothesubsurface formation are estimated. Magnitudes and directions of principalstresses areestimated from the hypocenters and from amplitude and phase of the detectedseismicsignals for each of the microseismic events. Shear and normal stresses ofinducedfractures are from the estimated principal stresses. A fluid pressure requiredto causeformation failure on each fracture is estimated using the estimated shear andnormalstresses.
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