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Landslides, threshold slopes, and the survival of relict terrain in the wake of the Mendocino Triple Junction

2016; Geological Society of America; Volume: 44; Issue: 5 Linguagem: Inglês

10.1130/g37530.1

1943-2682

Georgina L. Bennett, Scott R. Miller, Joshua J. Roering, D. A. Schmidt,

earthquake and tectonic studies

Research Article| May 01, 2016 Landslides, threshold slopes, and the survival of relict terrain in the wake of the Mendocino Triple Junction Georgina L. Bennett; Georgina L. Bennett 1Department of Geological Sciences, University of Oregon, 1275 E 13th Ave, Eugene, Oregon 97403-1272, USA *Current address: Department of Geosciences, Colorado State University, 1482 Campus Delivery, Fort Collins, Colorado 80523-1482, USA. Search for other works by this author on: GSW Google Scholar Scott R. Miller; Scott R. Miller 2Department of Geology and Geophysics, University of Utah, 115 S 1460 E, Salt Lake City, Utah 84112-0102, USA Search for other works by this author on: GSW Google Scholar Joshua J. Roering; Joshua J. Roering 1Department of Geological Sciences, University of Oregon, 1275 E 13th Ave, Eugene, Oregon 97403-1272, USA Search for other works by this author on: GSW Google Scholar David A. Schmidt David A. Schmidt 3Department of Earth and Space Sciences, University of Washington, 4000 15th Avenue, Seattle, Washington 98195-1310, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Georgina L. Bennett *Current address: Department of Geosciences, Colorado State University, 1482 Campus Delivery, Fort Collins, Colorado 80523-1482, USA. 1Department of Geological Sciences, University of Oregon, 1275 E 13th Ave, Eugene, Oregon 97403-1272, USA Scott R. Miller 2Department of Geology and Geophysics, University of Utah, 115 S 1460 E, Salt Lake City, Utah 84112-0102, USA Joshua J. Roering 1Department of Geological Sciences, University of Oregon, 1275 E 13th Ave, Eugene, Oregon 97403-1272, USA David A. Schmidt 3Department of Earth and Space Sciences, University of Washington, 4000 15th Avenue, Seattle, Washington 98195-1310, USA Publisher: Geological Society of America Received: 17 Nov 2015 Revision Received: 14 Mar 2016 Accepted: 20 Mar 2016 First Online: 09 Mar 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2016 Geological Society of America Geology (2016) 44 (5): 363–366. https://doi.org/10.1130/G37530.1 Article history Received: 17 Nov 2015 Revision Received: 14 Mar 2016 Accepted: 20 Mar 2016 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Georgina L. Bennett, Scott R. Miller, Joshua J. Roering, David A. Schmidt; Landslides, threshold slopes, and the survival of relict terrain in the wake of the Mendocino Triple Junction. Geology 2016;; 44 (5): 363–366. doi: https://doi.org/10.1130/G37530.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Establishing landscape response to uplift is critical for interpreting sediment fluxes, hazard potential, and topographic evolution. We assess how landslides shape terrain in response to a wave of uplift traversing the northern California Coast Ranges (United States) in the wake of the Mendocino Triple Junction. We extracted knickpoints, landslide erosion rates, and topographic metrics across the region modified by Mendocino Triple Junction migration. Landslide erosion rates mapped from aerial imagery are consistent with modeled uplift and exhumation, while hillslope gradient is invariant across the region, suggesting that landslides accommodate uplift, as predicted by the threshold slope model. Landslides are concentrated along steepened channel reaches downstream of knickpoints generated by base-level fall at channel outlets, and limit slope angles and relief. We find evidence that landslide-derived coarse sediment delivery may suppress catchment-wide channel incision and landscape denudation over the time required for the uplift wave to traverse the region. We conclude that a landslide cover effect may provide a mechanism for the survival of relict terrain and orogenic relief in the northern Californian Coast Ranges and elsewhere over millennial time scales. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.