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Dive into the research topics where Michael D. Hylland is active.

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Featured researches published by Michael D. Hylland.


Journal of Geophysical Research | 2016

Fault segmentation: New concepts from the Wasatch Fault Zone, Utah, USA

Christopher B. DuRoss; Stephen F. Personius; Anthony J. Crone; Susan S. Olig; Michael D. Hylland; William R. Lund; David P. Schwartz

The question of whether structural segment boundaries along multisegment normal faults such as the Wasatch fault zone (WFZ) act as persistent barriers to rupture is critical to seismic hazard analyses. We synthesized late Holocene paleoseismic data from 20 trench sites along the central WFZ to evaluate earthquake rupture length and fault segmentation. For the youngest (<3 ka) and best-constrained earthquakes, differences in earthquake timing across prominent primary segment boundaries, especially for the most recent earthquakes on the north-central WFZ, are consistent with segment-controlled ruptures. However, broadly constrained earthquake times, dissimilar event times along the segments, the presence of smaller-scale (subsegment) boundaries, and areas of complex faulting permit partial-segment and multisegment (e.g., spillover) ruptures that are shorter (~20–40 km) or longer (~60–100 km) than the primary segment lengths (35–59 km). We report a segmented WFZ model that includes 24 earthquakes since ~7 ka and yields mean estimates of recurrence (1.1–1.3 kyr) and vertical slip rate (1.3–2.0 mm/yr) for the segments. However, additional rupture scenarios that include segment boundary spatial uncertainties, floating earthquakes, and multisegment ruptures are necessary to fully address epistemic uncertainties in rupture length. We compare the central WFZ to paleoseismic and historical surface ruptures in the Basin and Range Province and central Italian Apennines and conclude that displacement profiles have limited value for assessing the persistence of segment boundaries but can aid in interpreting prehistoric spillover ruptures. Our comparison also suggests that the probabilities of shorter and longer ruptures on the WFZ need to be investigated.


Bulletin of the Seismological Society of America | 2015

Synchronous Ruptures along a Major Graben‐Forming Fault System: Wasatch and West Valley Fault Zones, Utah

Christopher B. DuRoss; Michael D. Hylland

Abstract The Salt Lake City segment (SLCS) of the Wasatch fault zone and the antithetic West Valley fault zone (WVFZ) form a large, Holocene‐active, intrabasin graben in northern Salt Lake Valley, Utah. We integrate previous paleoseismic data with new data from recent trench investigations and compare earthquake timing and displacement for both the master and antithetic faults of this major graben‐forming system to address whether the WVFZ ruptures simultaneously with the SLCS or is a separate, independent source of earthquakes. Nine SLCS surface‐faulting earthquakes postdate the Lake Bonneville highstand (∼18  ka); however, the record is most complete since ∼14  ka, yielding latest Pleistocene and Holocene mean recurrence estimates of ∼1.5  ky and ∼1.3–1.6  ky, respectively. Six post‐Bonneville‐highstand WVFZ earthquakes yield a mean recurrence of ∼2.0–3.6  ky; however, we consider the WVFZ earthquake record incomplete because of distributed faulting and limited paleoseismic data. Five of six WVFZ earthquakes have mean and 2 σ times that are very similar to those of SLCS earthquakes. WVFZ earthquake W5 lacks an apparent temporal correlation with an SLCS earthquake but occurred during a period for which the SLCS chronology may be incomplete. Mean WVFZ per‐event vertical displacement (∼0.5  m) is 26%–42% of that for the SLCS (∼1.2–1.9  m), consistent with that predicted by previous mechanical modeling of antithetic faulting triggered by slip on a listric master fault. We conclude that large WVFZ earthquakes are likely synchronous with, or triggered shortly after, SLCS surface‐faulting earthquakes. Although earthquake‐timing uncertainties preclude determining an unequivocal coseismic link between the WVFZ and SLCS, structural models suggest a high likelihood for synchronous rupture. These results have important implications for forecasting earthquake probabilities in complex normal‐faulting environments.


Environmental & Engineering Geoscience | 1997

Regional landslide-hazard evaluation using landslide slopes, Western Wasatch County, Utah

Michael D. Hylland; Mike Lowe


Utah Geological Survey Special Study | 2014

Late quaternary paleoseismology of the west valley fault zone: Insights from the Baileys Lake trench site

Michael D. Hylland; Christopher B. DuRoss; Greg N. McDonald; Susan S. Olig; Charles G. Oviatt; Shannon A. Mahan; Anthony J. Crone; Stephen F. Personius


Geological Society of America, Abstracts with Programs; (United States) | 1995

Geomorphology and Failure History of the Earthquake-Induced Farmington Siding Landslide Complex, Davis County, Utah

Mike Lowe; Kimm M. Harty; Michael D. Hylland


Archive | 2014

Holocene and latest Pleistocene paleoseismology of the Salt Lake City segment of the Wasatch Fault Zone, Utah, at the Penrose Drive Trench Site

Christopher B. DuRoss; Michael D. Hylland; Greg N. McDonald; Anthony J. Crone; Stephen F. Personius; Ryan D. Gold; Shannon A. Mahan


Archive | 2012

Basin-floor Lake Bonneville stratigraphic section as revealed in paleoseismic trenches at the Baileys Lake site, West Valley fault zone, Utah

Michael D. Hylland; Christopher B. DuRoss; Greg N. McDonald; Susan S. Olig; Charles G. Oviatt; Shannon A. Mahan; Anthony J. Crone; Stephen F. Personius


Archive | 2017

The history of late holocene surface-faulting earthquakes on the central segments of the Wasatch fault zone, Utah

Christopher B. DuRoss; Stephen F. Personius; Susan S. Olig; Anthony J. Crone; Michael D. Hylland; William R. Lund; David P. Schwartz


Archive | 2017

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

Christopher B. DuRoss; Michael D. Hylland; Adam Hiscock; Stephen F. Personius; Richard W. Briggs; Ryan D. Gold; Gregg S. Beukelman; Geg N McDonald; Ben Erickson; Adam McKean; Steve Angster; Roselyn King; Anthony J. Crone; Shannon A. Mahan


Archive | 2016

Earthquake probabilities for the Wassatch front region in Utah, Idaho, and Wyoming

Ivan G. Wong; William R. Lund; Christopher B. DuRoss; Patricia Thomas; Walter J. Arabasz; Anthony J. Crone; Michael D. Hylland; Nicolas Luco; Susan S. Olig; James C. Pechmann; Stephen F. Personius; Mark D. Petersen; David P. Schwartz; Robert B. Smith; Steve Rowman

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Christopher B. DuRoss

United States Geological Survey

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Anthony J. Crone

United States Geological Survey

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Stephen F. Personius

United States Geological Survey

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David P. Schwartz

United States Geological Survey

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Shannon A. Mahan

United States Geological Survey

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Mike Lowe

Utah Geological Survey

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Ryan D. Gold

United States Geological Survey

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