期刊
EARTH SURFACE PROCESSES AND LANDFORMS
卷 46, 期 1, 页码 307-319出版社
WILEY
DOI: 10.1002/esp.5025
关键词
rock avalanche; lake impact; lake sediments; catchment response; progressive slope failure; recurrence rates; prehistoric earthquake; Fernpass rockslide cluster
资金
- German National Academic Foundation (Studienstiftung des deutschen Volkes e.V.)
- British Society for Geomorphology
- Projekt DEAL
This study analyzes the impact of a 0.2 km Eibsee rock avalanche on Paleolake Eibsee and examines the age and potential triggering factors of the geological event. It demonstrates how a combination of geophysical, sedimentological, radiocarbon dating, and geomorphological methods can reveal the evolutionary history of a lake.
The similar to 0.2 km(3) Eibsee rock avalanche impacted Paleolake Eibsee and completely displaced its waters. This study analyses the lake impact and the consequences, and the catchment response to the landslide. A quasi-3D seismic reflection survey, four sediment cores from modern Lake Eibsee, reaching far down into the rock avalanche mass, nine radiocarbon ages, and geomorphic analysis allow us to distinguish the main rock avalanche event from a secondary debris avalanche and debris flow. The highly fluidized debris avalanche formed a megaturbidite and multiple swashes that are recorded in the lake sediments. The new calibrated age for the Eibsee rock avalanche of similar to 4080-3970 cal yr BP indicates a coincidence with rockslides in the Fernpass cluster and subaquatic landslides in Lake Piburg and Lake Plansee, and raises the possibility that a large regional earthquake triggered these events. We document a complex history of erosion and sedimentation in Lake Eibsee, and demonstrate how the catchment response and rebirth of the lake are revealed through the complementary application of geophysics, sedimentology, radiocarbon dating, and geomorphology. (c) 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
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