Rio Grande RIft Seismic TRAnsect (RISTRA) is designed to image and interpret crust and mantle structures beneath the southwestern United States, including the nature of the Colorado Plateau and Rio Grande rift (Figure 1). Key questions include the nature of crustal and mantle structures and thermal conditions beneath one of the more dramatic continental rifts on earth, and clues to understanding the anomalously unextended Colorado Plateau, which is currently surrounded by the predominantly extensional deformation of the western United States.

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The data collecting stage of RISTRA provided an exceptional 18 months (1999–2001) of broadband (Streckheisen STS-2 120 s...

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