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Controls on large landslide distribution and implications for the geomorphic evolution of the southern interior Columbia River basin

2011; Geological Society of America; Volume: 123; Issue: 9-10 Linguagem: Inglês

10.1130/b30061.1

1943-2674

E. B. Safran, Scott Anderson, M. Mills-Novoa, P. Kyle House, Lisa L. Ely,

Hydrology and Sediment Transport Processes

Research Article| September 01, 2011 Controls on large landslide distribution and implications for the geomorphic evolution of the southern interior Columbia River basin Elizabeth B. Safran; Elizabeth B. Safran * 1Environmental Studies Program, Lewis & Clark College, Portland, Oregon 97219, USA *E-mail: safran@lclark.edu Search for other works by this author on: GSW Google Scholar Scott W. Anderson; Scott W. Anderson † 2Physics Department, Lewis & Clark College, Portland, Oregon 97219, USA †Current address: Department of Geography, University of Colorado at Boulder, Boulder, Colorado 80309, USA. Search for other works by this author on: GSW Google Scholar Megan Mills-Novoa; Megan Mills-Novoa 1Environmental Studies Program, Lewis & Clark College, Portland, Oregon 97219, USA Search for other works by this author on: GSW Google Scholar P. Kyle House; P. Kyle House § 3Nevada Bureau of Mines and Geology and University of Nevada at Reno, Reno, Nevada 89503, USA §Current address: U.S. Geological Survey, Flagstaff, Arizona 86001, USA. Search for other works by this author on: GSW Google Scholar Lisa Ely Lisa Ely 4Department of Geological Sciences, Central Washington University, Ellensburg, Washington 98926, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Elizabeth B. Safran * 1Environmental Studies Program, Lewis & Clark College, Portland, Oregon 97219, USA Scott W. Anderson † 2Physics Department, Lewis & Clark College, Portland, Oregon 97219, USA Megan Mills-Novoa 1Environmental Studies Program, Lewis & Clark College, Portland, Oregon 97219, USA P. Kyle House § 3Nevada Bureau of Mines and Geology and University of Nevada at Reno, Reno, Nevada 89503, USA Lisa Ely 4Department of Geological Sciences, Central Washington University, Ellensburg, Washington 98926, USA *E-mail: safran@lclark.edu †Current address: Department of Geography, University of Colorado at Boulder, Boulder, Colorado 80309, USA. §Current address: U.S. Geological Survey, Flagstaff, Arizona 86001, USA. Publisher: Geological Society of America Received: 01 Mar 2009 Revision Received: 15 Jan 2010 Accepted: 13 Apr 2010 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2011 Geological Society of America GSA Bulletin (2011) 123 (9-10): 1851–1862. https://doi.org/10.1130/B30061.1 Article history Received: 01 Mar 2009 Revision Received: 15 Jan 2010 Accepted: 13 Apr 2010 First Online: 08 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 Elizabeth B. Safran, Scott W. Anderson, Megan Mills-Novoa, P. Kyle House, Lisa Ely; Controls on large landslide distribution and implications for the geomorphic evolution of the southern interior Columbia River basin. GSA Bulletin 2011;; 123 (9-10): 1851–1862. doi: https://doi.org/10.1130/B30061.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Large landslides (>0.1 km2) are important agents of geomorphic change. While most common in rugged mountain ranges, large landslides can also be widespread in relatively low-relief (several 100 m) terrain, where their distribution has been relatively little studied. A fuller understanding of the role of large landslides in landscape evolution requires addressing this gap, since the distribution of large landslides may affect broad regions through interactions with channel processes, and since the dominant controls on landslide distribution might be expected to vary with tectonic setting. We documented >400 landslides between 0.1 and ∼40 km2 across ∼140,000 km2 of eastern Oregon, in the semiarid, southern interior Columbia River basin. The mapped landslides cluster in a NW-SE–trending band that is 50–100 km wide. Landslides predominantly occur where even modest local relief (∼100 m) exists near key contacts between weak sedimentary or volcaniclastic rock and coherent cap rock. Fault density exerts no control on landslide distribution, while ∼10% of mapped landslides cluster within 3–10 km of mapped fold axes. Landslide occurrence is curtailed to the NE by thick packages of coherent basalt and to the SW by limited local relief. Our results suggest that future mass movements will localize in areas stratigraphically preconditioned for landsliding by a geologic history of fluviolacustrine and volcaniclastic sedimentation and episodic capping by coherent lava flows. In such areas, episodic landsliding may persist for hundreds of thousands of years or more, producing valley wall slopes of ∼7°–13° and impacting local channels with an evolving array of mass movement styles. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.