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- W64692350 abstract "The Rocky Mountain Front PASSCAL (Program for Array Studies of the Continental Lithosphere) experiment was designed to seismically image the transition from the stable craton in the eastern United States to the active tectonic west trough the use of travel times and waveforms of distant earthquakes. The Rocky Mountain Front experiment consisted of a two-phase deployment of broad band seismometers; a reconnaissance phase in 1991 consisting of eight broad band seismometers in an east-west line stretching across Colorado, and, in 1992, a deployment of 30 broad band seismometers throughout Colorado, eastern Utah, and western Kansas. Broad band receiver functions are examined in order to determine variations in crustal thickness from teleseismic P waveforms recorded with this array. For stations in the Great Plains, a strong P-to-S conversion interpreted to be from the Moho is observed from all azimuths. Within the Rocky Mountains, a weaker P-to-S conversion interpreted to be from the base of the Moho is observed. Based on the timing of these P-to-S conversions the crust does not appear to be thicker under the Rockies than under the Great Plains. Further west, in the Colorado Plateau, a weak Moho conversion is observed, which might be attributed to a smallermore » impedance contrast at the crust-mantle boundary or a transitional Moho. These results are in general agreement with refraction data, which indicate little change in crustal thickness between the Great Plains and the Rocky Mountains at these latitudes, and relatively thinner crust in the Colorado Plateau. These results suggest that the Rocky Mountains are not isostatically compensated by a simple Airy-type crustal root, as might be inferred solely from gravity data.« less" @default.
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- W64692350 date "1993-04-01" @default.
- W64692350 modified "2023-09-26" @default.
- W64692350 title "Crustal thickness variations across the Rocky Mountain Front from teleseismic receiver functions" @default.
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