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Holocene earthquake history of the northern Weber segment of the Wasatch fault zone, Utah

Holocene earthquake history of the northern Weber segment of the Wasatch fault zone, Utah
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By: A. R. Nelson, M. Lowe, S. F. Personius, L. A. Bradley, S. L. Forman, R. H. Klauk, and J. Garr

This Utah Geological Survey Special Study, Holocene Earthquake History of the Northern Weber Segment of the Wasatch Fault Zone, Utah, is the thirteenth report in the Paleoseismology of Utah series. This series makes the results of paleoseismic investigations in Utah available to geoscientists, engineers, planners, public officials, and the general public. These studies provide critical information regarding paleoearthquake parameters such as earthquake timing, recurrence, displacement, slip rate, and fault geometry, which can be used to characterize potential seismic sources and evaluate the long-term seismic hazard presented by Utah’s Quaternary faults.

This report presents the results of a cooperative investigation between the U.S. Geological Survey and the Utah Geological Survey of the earthquake history recorded at two sites on the northern part of the 61-km-long Weber segment of the Wasatch fault zone. This study was completed between 1985 and 1990. Early published reports on this study were preliminary. This UGS Miscellaneous Publication presents the investigation results in more detail than previously available. This report also includes a comprehensive evaluation of all paleoseismic information for the Weber segment, and synthesizes that information to give a clearer understanding of the segment’s recent earthquake history.

This study shows that (1) four surface-faulting earthquakes occurred on the Weber segment in the middle to late Holocene, (2) comparison of earthquake histories at all trench sites on the Weber segment indicates that surface-faulting earthquakes of different size ruptured different lengths of the segment, (3) earthquakes that produce different rupture lengths and displacements complicate recurrence-interval calculations, (4) surface displacements measured across fault scarps along the segment point to differences in rupture extent and hence earthquake magnitude, (5) Holocene slip rates calculated from scarp profiles are inconsistent with much lower slip rates determined from trench-derived displacement data, and (6) additional investigations are required to answer critical questions along the rapidly urbanizing Weber segment.

Other Information:
Published: 2006
Pages: 39 p.
Plates: 2 pl.
Location: Davis and Weber Counties
Media Type: CD-ROM Publication

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