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This map, the fourth in a series of 1:50,000-scale maps of the Wasatch fault zone, depicts the surficial deposits and faults along the Weber segment and part of the adjacent Salt Lake City segment of the Wasatch fault zone in northern Utah (fig. 1). This is the first map that is sufficiently detailed to be useful for interpreting the paleoseismic history of this part of the Wasatch fault zone. The map is also a guide to the best sites for future detailed studies of paleoearthquake magnitude and recurrence on the segment. These types of geologic studies will form a quantitative basis for earthquake hazard assessment along the Wasatch Front. One of the main objectives of our mapping of the Weber segment was to determine if the distribution of deposits and fault scarps between North Ogden and Bountiful indicated that this part of the fault has behaved as a single fault segment during the latest Pleistocene and Holocene, or whether it consisted of two or more segments. Most major normal and strikeslip fault zones are thought to be composed of several seismically independent segments (Zoback, 1983; Schwartz and Coppersmith, 1986; Doser, 1989; Thenhans and Barnhard, 1989). Segments are often bounded by "non-conservative barriers" to fault-rupture propagation (Crone and others, 1987; Fonseca, 1988; dePolo and others, 1989; Thatcher and Bonilla, 1989). Nonconservative barriers are regions along a fault where the orientation of the slip vector changes between adjacent parts of a fault; these regions have been observed to mark the location of the initiation and termination of fault ruptures (King and Nabelek, 1985). The concept of fault segmentation is important to paleoseismic analysis of active fault zones because during a major earthquake, surface faulting is commonly restricted to one or two segments of the fault and the length of surface rupture is roughly proportional to the size of the earthquake. Initial work on segmentation of the Wasatch fault zone, summarized in Swan and others (1980) and

Surficial geologic map of the Weber segment, Wasatch Fault zone, Weber and Davis counties, Utah