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Tight gas-bearing formations are those which have limited permeability; hence gas does not readily flow through them to recovery wells. It has been well-established that production in these formations can be significantly increased by stimulating the rock using hydraulic fracture treatments. This report provides general guidelines by evaluating the effects of several key factors (velocity model, receiver coverage, receiver aperture, and the use of multiple phases) on the accuracy of location. To do this, we have elected to use a finite-difference-based location technique which is particularly well-suited to the microseism location problem. The test data set comes from the well-characterized GRI (Gas Research Institute)/DOE M-Site, near Rifle, Colorado.