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U. S. GEOLOGICAL SURVEY FEDERAL CENTER, DENVER, COLORADO
Abstract
The GNOME underground nuclear explosion was recorded at 11 locations ranging from 31 to 431 km north of ground zero near Carlsbad, New Mexico. The seismograms are characterized by the arrival of many phases within a few seconds of the first arrivals. Interpretation of the first arrivals and the more prominent later arrivals indicates that the earth's crust is about 50 km thick in eastern New Mexico. Several arrivals have been tentatively identified as reflections from crustal layers and from the base of the crust. A prominent later arrival has been identified as a mantle shear phase with a velocity of 4.45 km/sec.
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