Tag Archive for: Paleoseismology of Utah
Holocene Surface-Faulting Earthquakes at the Spring Lake and North Creek Sites on the Wasatch Fault Zone: Evidence for Complex rupture of the Nephi Segment
By: Christopher B. DuRoss, Michael D. Hylland, Adam I. Hiscock, Stephen F. Personius, Richard W. Briggs, Ryan D. Gold, Gregg S. Beukelman, Greg N. McDonald, Ben A. Erickson, Adam P. McKean, Stephen J. Angster, Roselyn King, Anthony J. Crone, and Shannon A. Mahan
This 44-page report presents new data from the Spring Lake and North Creek trench sites on the Nephi segment of the Wasatch fault zone. We use paleoseismic data from these sites to refine Holocene earthquake chronologies for the northern and southern strands of the segment, calculate earthquake recurrence and fault slip rates, and assess whether the strands rupture independently or synchronously in large earthquakes. At the Spring Lake site, at least five to seven earthquakes occurred since ~13.1 ka, yielding a mean Holocene recurrence of ~1.2–1.5 kyr; at the North Creek site, at least five earthquakes occurred since ~4.7 ka, yielding a mean recurrence ~1.1–1.3 kyr. We integrate these results with previous paleoseismic data for the segment, discuss the timing and recurrence of large Nephi segment earthquakes, and evaluate possible models of surface-fault rupture involving the two fault strands.
PALEOSEISMIC INVESTIGATION OF THE NORTHERN WEBER SEGMENT OF THE WASATCH FAULT ZONE AT THE RICE CREEK TRENCH SITE, NORTH OGDEN, UTAH
Christopher B. DuRoss, Stephen F. Personius, Anthony J. Crone, Greg N. McDonald, David J. Lidke
This report presents new paleoseismic information for the northern Weber segment of the Wasatch fault zone, collected as part of a joint Utah Geological Survey and U.S. Geological Survey fault-trench investigation at Rice Creek. This research, which was partially funded through the National Earthquake Hazards Reduction Program, expands the record of Weber-segment paleoearthquakes into the early Holocene, provides new timing and displacement data for the most recent earthquake, and helps reduce uncertainties in earthquake timing, recurrence, displacement, and vertical slip rate. These results are important for understanding segmentation of the northern Wasatch fault zone and for improving earthquake-hazard evaluations of the region.
CD (27 p. + 9 p. appendices, 2 pl.)
SS-130……….$19.95
Tag Archive for: Paleoseismology of Utah
Holocene Surface-Faulting Earthquakes at the Spring Lake and North Creek Sites on the Wasatch Fault Zone: Evidence for Complex rupture of the Nephi Segment
By: Christopher B. DuRoss, Michael D. Hylland, Adam I. Hiscock, Stephen F. Personius, Richard W. Briggs, Ryan D. Gold, Gregg S. Beukelman, Greg N. McDonald, Ben A. Erickson, Adam P. McKean, Stephen J. Angster, Roselyn King, Anthony J. Crone, and Shannon A. Mahan
This 44-page report presents new data from the Spring Lake and North Creek trench sites on the Nephi segment of the Wasatch fault zone. We use paleoseismic data from these sites to refine Holocene earthquake chronologies for the northern and southern strands of the segment, calculate earthquake recurrence and fault slip rates, and assess whether the strands rupture independently or synchronously in large earthquakes. At the Spring Lake site, at least five to seven earthquakes occurred since ~13.1 ka, yielding a mean Holocene recurrence of ~1.2–1.5 kyr; at the North Creek site, at least five earthquakes occurred since ~4.7 ka, yielding a mean recurrence ~1.1–1.3 kyr. We integrate these results with previous paleoseismic data for the segment, discuss the timing and recurrence of large Nephi segment earthquakes, and evaluate possible models of surface-fault rupture involving the two fault strands.
PALEOSEISMIC INVESTIGATION OF THE NORTHERN WEBER SEGMENT OF THE WASATCH FAULT ZONE AT THE RICE CREEK TRENCH SITE, NORTH OGDEN, UTAH
Christopher B. DuRoss, Stephen F. Personius, Anthony J. Crone, Greg N. McDonald, David J. Lidke
This report presents new paleoseismic information for the northern Weber segment of the Wasatch fault zone, collected as part of a joint Utah Geological Survey and U.S. Geological Survey fault-trench investigation at Rice Creek. This research, which was partially funded through the National Earthquake Hazards Reduction Program, expands the record of Weber-segment paleoearthquakes into the early Holocene, provides new timing and displacement data for the most recent earthquake, and helps reduce uncertainties in earthquake timing, recurrence, displacement, and vertical slip rate. These results are important for understanding segmentation of the northern Wasatch fault zone and for improving earthquake-hazard evaluations of the region.
CD (27 p. + 9 p. appendices, 2 pl.)
SS-130……….$19.95
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The Utah Geological Survey (UGS) is a division of the Utah Department of Natural Resources. Several specialized programs comprise the UGS: Data Management, Energy & Minerals, Geologic Hazards, Geologic Information & Outreach, Geologic Mapping, Groundwater & Wetlands, and Paleontology.