This 43-page report presents new data from the Willow Creek site that provides well-defined and narrow bounds on the times of the three youngest earthquakes on the southern strand of the Nephi segment, Wasatch Fault zone, and refines the time of the youngest earthquake to about 200 years ago. This is the youngest surface rupture on the entire Wasatch fault zone, which occurred about a century or less before European settles arrived in Utah. Two trenches at the Willow Creek site exposed three scarp-derived colluvial wedges that are evidence of three paleoearthquakes. OxCal modeling of ages from Willow Creek indicate that paleoearthquake WC1 occurred at 0.2 ± 0.1 ka, WC2 occurred at 1.2 ± 0.1 ka, and WC3 occurred at 1.9 ± 0.6 ka. Stratigraphic constraints on the time of paleoearthquake WC4 are extremely poor, so OxCal modeling only yields a broadly constrained age of 4.7 ± 1.8 ka. Results from the Willow Creek site significantly refine the times of late Holocene earthquakes on the Southern strand of the Nephi segment, and this result, when combined with a reanalysis of the stratigraphic and chronologic information from previous investigations at North Creek and Red Canyon, yield a stronger basis of correlating individual earthquakes between all three sites.
Hylland, M.D., DuRoss, C.B., McDonald, G.N., Olig, S.S., Oviatt, C.G., Mahan, S.A., Crone, A.J., and Personius, S.F., 2012, Basin-floor Lake ... Janda, R.J., Scott, K.M., Nolan, K.M., and Martinson, H.A., 1981, 146 Utah Geological Survey.
This CD contains a 33 page report, appendix, and plate.
Hunt, C.B., 1988, Geology of the Henry Mountains, Utah, as recorded in the notebooks of G.K. Gilbert, 1875–76: Geological Society of America Memoir 167, 229 p. Jackson, M.D., and Pollard, D.D., 1988, The laccolith-stock controversy: New ...
The purpose of the review was to (1) critically evaluate the accuracy and completeness of the paleoseismictrenching data, particularly regarding earthquake timing and displacement, (2) where the data permit, assign consensus, preferred ...
This publication presents probabilistic earthquake forecasts developed by the Working Group on Utah Earthquake Probabilities which developed 30,50, and 100 year forecasts that include combined time dependent probabilities of large ...
Overall, this book focuses on the current understanding of the dynamic interplay between surface processes and active tectonics.
Lake Bonneville was the last and probably the largest of these lakes. By 11,000 yr BP, Lake Bonneville had receded to approximately the size of the present Great Salt Lake.
A beautifully designed and easy to understand publication discussing the geologic history of the Wasatch Fault and possible dangers it poses to anyone living nearby. This is a perfect introduction to the fault for anyone of all ages.
Despite mining's multidimensional role in the history of Utah since Euro-american settlement, there has never been a book that surveyed and contextualized its impact. From the Ground Up fill that...
Rough-Hewn Land weaves these stories into the human history of the West.