Tag Archive for: Paleoseismology Series

Utah Geological Survey

Paleoseismology of Utah, Volume 27: Geologic Mapping and Paleoseismic Investigations of the Washington Fault Zone, Washington County, Utah, and Mohave County, Arizona

MP-15-6 cd cover PALEOSEISMOLOGY

Edited By: William R. Lund

This publication presents four investigations that provide new geologic and paleoseismic data on the Washington fault zone in southwestern Utah and northwestern Arizona. (1) New 1:24,000-scale geologic mapping shows the location and length of young surface ruptures and the relative ages of displaced surficial deposits along the fault zone. Based on the mapping, the former Northern section of the fault zone has been subdivided into the Fort Pearce and Washington Hollow sections. (2) A paleoseismic trenching investigation of a scarp on a latest Quaternary alluvial fan in Arizona that provides information on paleoearthquake timing, displacement, and recurrence for the Fort Pearce section, which traverses the St. George metropolitan area. (3) Trace element and major oxide geochemical correlation and radiometric dating of volcanic flows displaced across the fault that provide early to middle Quaternary vertical slip-rates for the Fort Pearce and Sullivan Draw sections of the fault.. (4) A geotechnical investigation that provides information on fault locations, paleoearthquakes, and displacement no the Fort Pearce section. These investigations show the Fort Pearce section of the Washington fault zone has experienced at least two surface-faulting earthquakes in the Holocene and a minimum of five earthquakes in the past ~68 ka.

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Utah Geological Survey

Compilation of 1970s Woodward-Lundgren & Associates Wasatch fault investigation reports and low-sun-angle aerial photography, Wasatch Front and Cache Valley, Utah and Idaho

OFR-632 insert

By: Steve D. Bowman, Adam I. Hiscock, and Corey D. Unger

This nine DVD set contains a descriptive 8-page report and digital files created from the Wasatch fault investigation project performed for the Utah Geologic and Mineralogical Survey (now the Utah Geological Suvey) and U.S. Geological Survey by Woodward-Lundgren & Associates. The project was performed to identify surface fault rupture hazard areas along the Wasatch fault in Cache Valley. This compilation contains digital scans of three separate Wasatch fault reports, 47 fault maps, and 1382 scanned low-sun-angle-arial photographs (frames). The digital files include aerial photograph scans in TIFF format, fault maps in TIFF and Adobe PDF formats, and index maps in Google Earth KMZ, GIS shapefile and Adobe PDF formats. Specialized software (not included) is required to utilized the Google Earth and GIS files, and can be downloaded from the internet.

This compilation will be useful for professionals involved with paleoseismology investigations; land-use planning and management; government agencies; and the general public and others as a historical archive. Low-sun-angle aerial photography was used to highlight certain topographic features, such as fault scarps and traces, for mapping purposes.

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