Gravity measurements show that, regionally, the Llano Estacado of Texas and New Mexico is in isostatic equilibrium. Thicknesses calculated from Bouguer gravity anomalies indicate that the crust thins from northwest to southeast. The Bouguer anomalies indicate an average crustal thickness of 40 to 46 km. The travel time of Pn from the Gnome nuclear explosion to Lubbock, Texas, indicates approximately the same average crustal thickness.

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