A technique is discussed for the possible use of the Lg phase for magnitude determination for regional and near regional events. Data used in this study was obtained from several test shots at the Nevada Test Site recorded by Long Range Seismic Measurements stations. The comparison of magnitudes determined by this method appear to give better results for epicentral distances up to about 2000 km than the body wave technique presently in use. This research is the result of a preliminary investigation to determine the feasibility of the method and further study is continuing.

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