DOI: 10.1029/2017JF004455
Scopus记录号: 2-s2.0-85046701733
论文题名: Multistage Rock-Slope Failures Revealed in Lake Sediments in a Seismically Active Alpine Region (Lake Oeschinen, Switzerland)
作者: Knapp S. ; Gilli A. ; Anselmetti F.S. ; Krautblatter M. ; Hajdas I.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 4 起始页码: 658
结束页码: 677
语种: 英语
英文关键词: geomorphic work
; lake sediments
; landslide-impact wave
; multistage rock-slope failure
; recurrence rates
; rockfall dating
Scopus关键词: alpine environment
; earthquake event
; fluvial geomorphology
; lacustrine deposit
; landslide
; Pleistocene-Holocene boundary
; radiocarbon dating
; rock avalanche
; rockfall
; sedimentology
; seismicity
; slope failure
; Bernese Alps
; Central Alps
; Switzerland
英文摘要: Late Glacial and Holocene rock-slope failures occur often as multistage failures where paraglacial adjustment and stress adaptation are hypothesized to control phases of detachment. However, only limited data sets are available to decipher large multistage rock-slope failures in detail. Here we apply sedimentology, radiocarbon dating, and geophysics to reconstruct multistage rock-slope failure recorded in lake sediments. We present a unique inventory from Lake Oeschinen (Bernese Alps, Switzerland) covering ~2.5 kyr of rock-slope failure history. The lake sediments have been investigated using sediment-core analysis, radiocarbon dating, and seismic-to-core and core-to-core correlations, which were linked to (pre-) historic and meteorological records. The results imply that the lake in its present extent is significantly younger than the ~9.5-kyr-old Kandersteg rock avalanche in the close vicinity. Up to eleven rock-slope failure events could be identified and related to specific detachment scarps, which provided information for energy considerations. Four events likely coincided with (pre-) historic earthquakes. At least six events detached from the same area, potentially initiated by prehistoric seismicity and later from stress-relaxation processes. The data imply unexpected high recurrence rates (~1/300 years) and also help to understand the generation of a historical lake-outburst flood. Here we show how polymethodical analysis of lake sediments can help to decipher massive multistage rock-slope failures, which are often camouflaged in subaerial settings. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114166
Appears in Collections: 气候减缓与适应
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作者单位: Landslide Research Group, Technical University of Munich, Munich, Germany; Geological Institute, ETH Zurich, Zurich, Switzerland; Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Laboratory of Ion Beam Physics, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Knapp S.,Gilli A.,Anselmetti F.S.,et al. Multistage Rock-Slope Failures Revealed in Lake Sediments in a Seismically Active Alpine Region (Lake Oeschinen, Switzerland)[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(4)