Paleoseismic Reconnaissance of the Sevier Fault, Kane and Garfield Counties, Utah

Paleoseismic Reconnaissance of the Sevier Fault, Kane and Garfield Counties, Utah PDF Author: William R. Lund
Publisher: Utah Geological Survey
ISBN: 1557917876
Category : Science
Languages : en
Pages : 37

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Book Description
This 37 page report presents the results of a study of the Sevier fault in Utah.

Paleoseismic Reconnaissance of the Sevier Fault, Kane and Garfield Counties, Utah

Paleoseismic Reconnaissance of the Sevier Fault, Kane and Garfield Counties, Utah PDF Author: William R. Lund
Publisher: Utah Geological Survey
ISBN: 1557917876
Category : Science
Languages : en
Pages : 37

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Book Description
This 37 page report presents the results of a study of the Sevier fault in Utah.

History of Late Holocene Earthquakes at the Willow Creek Site and on the Nephi Segment, Wasatch Fault Zone, Utah

History of Late Holocene Earthquakes at the Willow Creek Site and on the Nephi Segment, Wasatch Fault Zone, Utah PDF Author: Anthony J. Crone
Publisher: Utah Geological Survey
ISBN: 1557918945
Category : CD-ROMs
Languages : en
Pages : 65

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Book Description
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.

Survey Notes

Survey Notes PDF Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 64

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Book Description


Alluvial Fan Flooding

Alluvial Fan Flooding PDF Author: National Research Council
Publisher: National Academies Press
ISBN: 0309055423
Category : Science
Languages : en
Pages : 183

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Book Description
Alluvial fans are gently sloping, fan-shaped landforms common at the base of mountain ranges in arid and semiarid regions such as the American West. Floods on alluvial fans, although characterized by relatively shallow depths, strike with little if any warning, can travel at extremely high velocities, and can carry a tremendous amount of sediment and debris. Such flooding presents unique problems to federal and state planners in terms of quantifying flood hazards, predicting the magnitude at which those hazards can be expected at a particular location, and devising reliable mitigation strategies. Alluvial Fan Flooding attempts to improve our capability to determine whether areas are subject to alluvial fan flooding and provides a practical perspective on how to make such a determination. The book presents criteria for determining whether an area is subject to flooding and provides examples of applying the definition and criteria to real situations in Arizona, California, New Mexico, Utah, and elsewhere. The volume also contains recommendations for the Federal Emergency Management Agency, which is primarily responsible for floodplain mapping, and for state and local decisionmakers involved in flood hazard reduction.

Proceedings Volume, Basin and Range Province Seismic-Hazards Summit

Proceedings Volume, Basin and Range Province Seismic-Hazards Summit PDF Author: William R. Lund
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 220

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Book Description


The Oquirrh Fault Zone, Tooele County, Utah

The Oquirrh Fault Zone, Tooele County, Utah PDF Author: William R. Lund
Publisher: Utah Geological Survey
ISBN: 1557913706
Category : Faults (Geology)
Languages : en
Pages : 70

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Book Description
The two reports in this Special Study provide critical geologic and paleoseismic information on the Oquirrh fault zone, a Quaternary fault in eastern Tooele County, west-central Utah. The Oquirrh fault zone has long been recognized as a potential source of large earthquakes which could affect military and hazardous waste facilities, nearby towns, and populous areas of the more distant central Wasatch Front. 64 pages + 2 plates

Guidelines for the Geologic Evaluation of Debris-flow Hazards on Alluvial Fans in Utah

Guidelines for the Geologic Evaluation of Debris-flow Hazards on Alluvial Fans in Utah PDF Author: Richard E. Giraud
Publisher: Utah Geological Survey
ISBN: 1557917299
Category : Science
Languages : en
Pages : 21

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Book Description
The Utah Geological Survey (UGS) developed these guidelines to help geologists evaluate debris-flow hazards on alluvial fans to ensure safe development. Debris-flow hazard evaluations are particularly important because alluvial fans are the primary sites of debris-flow deposition and are also favored sites for development. The purpose of a debris-flow-hazard evaluation is to characterize the hazard and provide design parameters for risk reduction. The UGS recommends critical facilities and structures for human occupancy not be placed in active debris flow travel and deposition areas unless the risk is reduced to an acceptable level. These guidelines use the characteristics of alluvial fan deposits as well as drainage-basin and feeder-channel sediment-supply conditions to evaluate debris-flow hazards. The hazard evaluation relies on the geomorphology, sedimentology, and stratigraphy of existing alluvial fan deposits. Analysis of alluvial-fan deposits provides the geologic basis for estimating frequency and potential volume of debris flows and describing debris-flow behavior. Drainage-basin and feeder-channel characteristics determine potential debris-flow susceptibility and the volume of stored channel sediment available for sediment bulking in future flows.

Quaternary Tectonics of Utah with Emphasis on Earthquake-hazard Characterization

Quaternary Tectonics of Utah with Emphasis on Earthquake-hazard Characterization PDF Author: Suzanne Hecker
Publisher: Utah Geological Survey
ISBN: 1557910944
Category : Earthquake hazard analysis
Languages : en
Pages : 117

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Book Description
This report consolidates and synthesizes information on Quaternary faulting, folding, and volcanism in Utah and characterizes recent tectonic activity throughout the state. The primary purpose is to provide a comprehensive reference on fault-specific seismic sources and surface rupture to facilitate the evaluation of earthquake hazards in Utah. Two 1:500,000-scale maps show Quaternary tectonic features categorized according to probable ages of most recent surface deformation and ages of volcanic rocks. Two appendix tables summarize significant data on the activity of mapped features, including ages of surface displacements and volcanism, slip rates, recurrence intervals, displacement amounts, and lengths of surface ruptures. Good age control and quantitative activity data are available for relatively few tectonic features in Utah and detailed work is needed in many areas of the state. 157 pages + 2 plates

2016GUIDELINES FOR INVESTIGATING GEOLOGIC HAZARDS AND PREPARING ENGINEERING-GEOLOGY REPORTS, WITH A SUGGESTED APPROACH TO GEOLOGIC-HAZARD ORDINANCES IN UTAH

2016GUIDELINES FOR INVESTIGATING GEOLOGIC HAZARDS AND PREPARING ENGINEERING-GEOLOGY REPORTS, WITH A SUGGESTED APPROACH TO GEOLOGIC-HAZARD ORDINANCES IN UTAH PDF Author: Steve D. Bowman
Publisher: Utah Geological Survey
ISBN: 1557919291
Category : Science
Languages : en
Pages : 217

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Book Description
The purpose of these guidelines for investigating geologic hazards and preparing engineering-geology reports, is to provide recommendations for appropriate, minimum investigative techniques, standards, and report content to ensure adequate geologic site characterization and geologic-hazard investigations to protect public safety and facilitate risk reduction. Such investigations provide important information on site geologic conditions that may affect or be affected by development, as well as the type and severity of geologic hazards at a site, and recommend solutions to mitigate the effects and the cost of the hazards, both at the time of construction and over the life of the development. The accompanying suggested approach to geologic-hazard ordinances and school-site investigation guidelines are intended as an aid for land-use planning and regulation by local Utah jurisdictions and school districts, respectively. Geologic hazards that are not accounted for in project planning and design often result in additional unforeseen construction and/or future maintenance costs, and possible injury or death.

Neotectonic Deformation Along the East Cache Fault Zone, Cache County, Utah

Neotectonic Deformation Along the East Cache Fault Zone, Cache County, Utah PDF Author: James McCalpin
Publisher:
ISBN:
Category : History
Languages : en
Pages : 52

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Book Description