However, between about 400 and 1500 years ago, the WFZ experienced six major surface-rupturing events, an average of one event every 220 years, or about twice as often as expected from the 6000-year record. Stavros V. Tolis, in Earthquake Hazard, Risk and Disasters, 2014. Detailed geologic mapping, topographic profiling, and subsur­ Even for “industrialized” materials such as concrete and steel uncertainties occur about their characteristics and behavior. 3 – Install an earthquake alarm in your living and work space.

> Clearly, the map tries to predict events that do not have a significant statistics within the input data, and most probably many of them did not even appear yet. Some sections, like the Salt Lake City segment, have not experienced a major earthquake in over 1350 years. It underlies an urban corridor of 1.6 million people (80% of Utah's population) representing the largest earthquake risk in the interior of the western United States. U.S. Geological Survey. Study of Earthquake Recurrence Intervals on the Wasatch Fault, Utah: Little Cottonwood Canyon Site. Detailed geologic mapping, topographic profiling, and trenching are being conducted at selected sites along the Wasatch fault zone to measure the cumulative fault displacements in Quaternary strata of various ages and to obtain data regarding the amount of displacement per surface faulting event and the number and recurrence of faulting events that produced the cumulative displacement. FAQ

Five are active, medial segments with Holocene slip rates of 1–2 mm a −1, recurrence intervals of 2000–4000 years and average lengths of about 50 km.

Radiocarbon age estimates on bulk-soil samples from paleosols developed on colluvial wedges constrain the timing of the two youngest paleoearthquakes.

An official website of the United States government. Authors.

F. H. Swan, III Kathryn L. Hanson David P. Schwartz Peter L. Knuepfer U.S. Geological Survey. Paleoseismological records for the past 6000 years indicate that a major surface-rupturing earthquake has occurred along one of the medial segments about every 395 ?? Libraries Copyright © 1991 Published by Elsevier Ltd. https://doi.org/10.1016/0191-8141(91)90062-N. The results of the investigations at the Kaysville and Hobble Creek sites are discussion in our previous reports, which are listed in Appendix A. Secure non-structural hazards, which are items in your home that can move during earthquake shaking. The authors have used paleoseismological data to identify 10 discrete segments of the WFZ. Besides this basic difficulty in the identification of the appropriate model of earthquake recurrence, in many instances, the overlooking of the early definitions by Cornell led to the confusing use of the terms probability and occurrence frequency (or return period) (Wang, 2011).

2 – Become an activist for seismic safety for schools and other public buildings built before 1985.

Five are active, medial segments with Holocene slip rates of 1-2 mm a-1, recurrence intervals of 2000-4000 years and average lengths of about 50 km.

We have used paleoseismological data to identify 10 discrete segments of the WFZ. Accessibility Statement The Wasatch fault zone (WFZ) forms the eastern boundary of the Basin and Range province and is the longest continuous, active normal fault (343 km) in the United States. By continuing you agree to the use of cookies. This pattern of temporal clustering is similar to that of the central Nevada—eastern California Seismic Belt in the western part of the Basin and Range province, where 11 earthquakes of M > 6.5 have occurred since 1860. Detailed geologic mapping, topographic profiling, and trenching are being conducted at selected sites along the Wasatch fault zone to measure the cumulative fault displacements in Quaternary strata of various ages and to obtain data regarding the amount of displacement per surface faulting event and the number and recurrence of faulting events that produced the cumulative displacement.

Although great effort has been made in understanding the composition and dynamics of the Earth, we have yet much to learn about tectonic processes and earthquakes.

Pleistocene alluvial-fan deposits. In 1883, G.K. Gilbert, the pioneer and father of Utah geology, wrote a letter to the Salt Lake Daily Tribune warning residents of earthquake risk in Utah. Abstract. About We use cookies to help provide and enhance our service and tailor content and ads. Study of Earthquake Recurrence Intervals on the Wasatch Fault, Utah: Little Cottonwood Canyon Site. Some of the steps that we have taken to help the citizens of Utah prepare have been: In 2015, we conducted a major survey of people in Utah County to get a clearer understanding of public knowledge regarding earthquakes, earthquake safety and preparedness.

> The general paucity of paleoseismic-trenching data, combined with largeuncertainties associated with some of the data, prevented using rigorous statistical tech-niques to determine RI and VSR values. Poorly supported critical services, such as gas and water pipelines, bridges and roads, and unstable slopes also pose a significant threat for emergency response to a major earthquake. This report presents our findings, interpretations, and preliminary conclusions based on our field investigations at the Little Cottonwood Canyon site.

Copyright, USU Library - 3000 Old Main Hill - Logan UT 84322 - 435.797.0816, All U.S. Government Documents (Utah Regional Depository).

1400 yr (preferred); minimum 500, maximum 2400 yr (<6.1 ka). However, with PSHA it is quite difficult, if not is quite difficult to take into account the information given by paleoseismicity (e.g., Michetti et al., 2012), morphostructural analysis (Gorshkov et al., 2004), or similar studies (e.g., Brune and Whitney, 2000). It underlies an urban corridor of 1.6 million people (80% of Utah's population) representing the largest earthquake risk in the interior of the western United States. More than 50% of Utah schools were built before seismic building codes, and many may collapse increasing the death toll among children. 60 years. Seismology is a very young science with its origins in the late nineteenth century. > My Account

Generally north-trending, range-bounding normal fault along the western side of the Malad Range (Clarkston Mountain), Wellsville Mountains, Wasatch Range, and San Pitch Mountains.

Seismology is a very young science with its origins in the late nineteenth century. the Wasatch fault zone coincident with the populous Wasatch Front, and typically are much less abundant for faults elsewhere in Utah. Five are less active, distal segments with mostly pre-Holocene surface ruptures, late Quaternary slip rates of <0.5 mm a−1 recurrence intervals of ≥10,000 years and average lengths of about 20 km.

At Kays­ ville, at least three surface faulting events have displaced an alluvial fan during the past 8000 ( ± 2000) years. U.S. Government Documents Our seismological records span over an extremely short period compared to the time scales of Earth processes. 1 – Take care of your own living and working space!

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