LATE HOLOCENE EARTHQUAKE HISTORY OF THE BRIGHAM CITY SEGMENT OF THE WASATCH FAULT ZONE AT THE HANSEN CANYON, KOTTER CANYON, AND PEARSONS CANYON TRENCH SITES, BOX ELDER COUNTY, UTAH
By Christopher B. DuRoss, Stephen F. Personius, Anthony J. Crone, Greg N. McDonald, and Richard W. Briggs
This report (28 p. + 5 appendices, and 3 plates) presents new information on the timing and displacement of late Holocene surface-faulting earthquakes on the Brigham City segment of the Wasatch fault zone, collected as part of a joint Utah Geological Survey and U.S. Geological Survey seismic-hazard evaluation. Paleoseismic data from two trench sites on the northern Brigham City segment (Hansen Canyon and Kotter Canyon sites) confirm the timing of the youngest surface-faulting earthquake, and results from a trench site on the previously unstudied southern part of the segment (Pearsons Canyon site) have important fault-segmentation implications. These results help clarify the timing, recurrence, and extent of large-magnitude earthquakes on the Brigham City segment, which will help improve seismic-hazard evaluations of the region. This study was partially funded by the National Earthquake Hazards Reduction Program.
Special Study 142 $19.95
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GREAT SALT LAKE BRINE CHEMISTRY DATABASE, 1966–2011
by Andrew Rupke and Ammon McDonald
This open-file release includes a brief 7-page report and the Great Salt Lake brine chemistry database in digital format. The report briefly describes the Great Salt Lake brine sampling program and database that the Utah Geological Survey has conducted and maintained since 1966. The Great Salt Lake brine chemistry database includes information on chemistry, salinity, and density of Great Salt Lake brine samples that have been collected from over 50 locations on Great Salt Lake. For this release the database has been reorganized into one Excel spreadsheet file for ease of use.
Open-File Report 596 $14.95
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MODERATELY SALINE GROUNDWATER IN THE UINTA BASIN, UTAH
By Paul B. Anderson, Michael D. Vanden Berg, Stephanie Carney, Craig Morgan, and Sonja Heuscher
The base of the moderately saline water (BMSW) (10,000 mg/L TDS transition) in the Uinta Basin was first mapped in 1987 and re-mapped in this study using similar methods. Water samples from primarily oil and gas activities through the basin’s history were compiled into a database (2788 records) and used as an aid in mapping. In addition, geophysical logs from 260 wells distributed throughout the basin were interpreted and used in mapping the BMSW. Regional groundwater flow paths, saline minerals, structural shape of the basin, and faults and fractures strongly influence the distribution of TDS levels. Both older and new data points were used to create an elevation contour map of the position of the shallowest occurrence of the BMSW below the surface. Depth-correlated water analysis data were mapped and compared to the log-derived BMSW. Mapped water analysis data indicate the northern portion of the basin has numerous occurrences of water fresher than 10,000 mg/L below the BMSW, indicating a complex stratification of salinity coincident with the area of primary recharge, whereas shallow saline waters dominate the central portion of the basin. 30-page report + 9 plates
Special Study 144 $24.95
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Interim Geologic Map of the Rush Valley 30′ x 60′ Quadrangle, Tooele, Utah, and Salt Lake Counties, Utah
By Donald L. Clark, Stefan M. Kirby, and Charles G. Oviatt
This CD contains two plates—the geologic map at 1:62,500 scale and the explanation sheet—plus a 62-page booklet, all in PDF format.
Open-File Report 593 $19.95
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