气候变化领域集成服务门户(CCPortal): Dendrochronological dating of landslides in western Oregon: Searching for signals of the Cascadia A.D. 1700 earthquake

CCPortal

DOI	10.1130/B35269.1
	Dendrochronological dating of landslides in western Oregon: Searching for signals of the Cascadia A.D. 1700 earthquake
	Struble W.T.; Roering J.J.; Black B.A.; Burns W.J.; Calhoun N.; Wetherell L.
发表日期	2020
ISSN	167606
起始页码	1775
结束页码	1791
卷号	132 期号:2021-07-08
英文摘要	Large-magnitude earthquakes and hydrologic events in mountainous settings commonly trigger thousands of landslides, and slope failures typically constitute a significant proportion of the damage associated with these events. Large, dormant deep-seated landslides are ubiquitous in the Oregon Coast Range, western United States, yet a method for calculating landslide ages with the precision required to diagnose a specific triggering event, including the A.D. 1700 Cascadia earthquake, has remained elusive. Establishing a compelling connection between prehistoric slope instability and specific triggers requires landslide ages with precision greater than that provided by 14C dating of detrital materials. Tree-ring analysis is the only known method capable of determining landslide age with this precision. Dozens of landslide-dammed lakes in western Oregon present an opportunity to use tree rings from drowned snags, or "ghost forests, " to establish the year of death, and thus landsliding. We cross-dated tree-ring indices from drowned Douglas fir trees with live tree-ring records from the Oregon Coast Range that exhibit synchronous, time-specific patterns due to regional climate variations. Our analyses determined that the landslides responsible for creating Wasson and Klickitat Lakes occurred in A.D. 1819 and 1751, respectively. The 14C dates from selected tree rings and landslide deposit detritus are consistent with our tree-ring analysis, although the ages exhibit high variability, revealing the limitations of using 14C dating alone. Because dendrochronology provides annual precision for landsliding, sampling of tree rings at additional landslide-dammed lakes throughout the Oregon Coast Range can be used to constrain the potential effects of ground motion and major storms on Cascadia landscapes. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184758
作者单位	Department of Earth Sciences, 1272 University of Oregon, Eugene, OR 97403, United States; Laboratory of Tree Ring Research, University of Arizona, 1215 E. Lowell Street, Tucson, AZ 85721, United States; Oregon Department of Geology and Mineral Industries, 800 NE Oregon Street, Portland, OR 97232, United States; Department of Geological Sciences, Central Washington University, 400 E. University Way, Ellensburg, WA 98926, United States
推荐引用方式 GB/T 7714	Struble W.T.,Roering J.J.,Black B.A.,et al. Dendrochronological dating of landslides in western Oregon: Searching for signals of the Cascadia A.D. 1700 earthquake[J],2020,132(2021-07-08).
APA	Struble W.T.,Roering J.J.,Black B.A.,Burns W.J.,Calhoun N.,&Wetherell L..(2020).Dendrochronological dating of landslides in western Oregon: Searching for signals of the Cascadia A.D. 1700 earthquake.Bulletin of the Geological Society of America,132(2021-07-08).
MLA	Struble W.T.,et al."Dendrochronological dating of landslides in western Oregon: Searching for signals of the Cascadia A.D. 1700 earthquake".Bulletin of the Geological Society of America 132.2021-07-08(2020).