A new method is presented for estimating the source location of an event, based on the assumption that the event creates a spherical wavefront which is recorded by a number of receivers with fixed locations. This method is suitable for locating microseismic events, mapping traveltimes that are computed along raypaths to gridded times, or for propagating first arrival times on a grid. Previous methods that computed traveltimes with spherical (or circular) wavefront assumptions used hyperbolic equations to estimate the location of the source. This method is based on the tangency of spheres (or circles) with radii defined by clock-times. Straightforward analytic solutions exist with two possible solutions, with the correct solution easily identified.
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