The Moab Fault, near Moab, Utah, United States, is an extensional fault that runs approximately NW-SE, passing to the west of the Arches National Park. It is about long and has a maximum displacement of about . The fault connects with the Tenmile Graben in the north and extends through the Moab-Spanish Valley to the south. The fault outcrop has a well-defined fault zone bordered by a damage zone of minor faults and fractures. The Moab Fault has been the focus of a number of studies, covering a range of topics including fault zone architecture, fault cementation, and fault seal prediction. Geological Setting The Moab Fault was active during a period between the Triassic and early Tertiary, with a break from mid-Jurassic until at least mid-Cretaceous. It is associated with two salt anticlines formed within the Fold and Fault Belt of the Paradox Basin in east-central Utah. The Paradox Basin is part of the Colorado Plateau that formed during the Late Paleozoic. Movement on the basement faults began in the Proterozoic and was greatest during mid-Pennsylvanian Rocky Mountain tectonism. The fault was reactivated at ~60 Ma, likely due to reinitiated salt movement during the Laramide Orogeny. Following its deposition, the salt was deformed to form a series of salt anticlines that were ultimately buried by 1–2 km of Jurassic to Tertiary sediments. Fault Geometry The architecture of the Moab fault zone is highly variable, and has been studied by several authors. The first systematic study was conducted by Foxford et al. in 1998, which classified architectural elements into slip band zones, shaley gouge zones and sandstone cataclastics and breccias. Thirty-seven transect exposures within the Moab fault zone were described. These exposures provide excellent data on lateral variation and structure features within the fault zone. The most studied transects include the Moab Canyon, R191 Canyon, Corral Canyon, Courthouse Mine, Bartlett Wash, and Waterfall Canyon. The Moab Fault is a sharply defined brittle shear zone (1–10 m wide). The overall geometry of the southern fault segment is that of a faulted anticline, modified by a minor component of normal drag adjacent to the fault. The fault is composed of three main components: a poorly exposed southern section, a central section (where the greatest throws are found), and a complex branching northern section that tips out to the northwest. At the north end of the Moab valley, there is a fault transfer zone,