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Bulletin of the Seismological Society of America; October 1987; v. 77; no. 5; p. 1626-1634
© 1987 Seismological Society of America
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Constraints on relative earthquake locations from cross-correlation of waveforms

BERGTHORA S. THORBJARNARDOTTIR and JAMES C. PECHMANN

DEPARTMENT OF GEOLOGY AND GEOPHYSICS UNIVERSITY OF UTAH, SALT LAKE CITY, UTAH 84112-1183

Abstract

Cross-correlations of filtered waveforms can be used to place strong constraints on relative locations of local earthquakes under the assumption that events producing very similar waveforms occur within a distance of one-quarter of the shortest wavelength for which the similarity is observed. Tests using digital seismograms of mine blasts with known locations, recorded by the University of Utah seismic network, support this "quarter wavelength" hypothesis. Application of this method can yield information on relative locations of earthquakes within source volumes of 1 km3 or smaller, which is seldom possible using arrival time data alone.




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