TY - JOUR
T1 - Impact of an 0.2 km3 Rock Avalanche on Lake Eibsee (Bavarian Alps, Germany) – Part II
T2 - Catchment Response to Consecutive Debris Avalanche and Debris Flow
AU - Knapp, Sibylle
AU - Anselmetti, Flavio S.
AU - Lempe, Bernhard
AU - Krautblatter, Michael
N1 - Publisher Copyright:
© 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
PY - 2021/1
Y1 - 2021/1
N2 - The ~0.2 km3 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 ~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.
AB - The ~0.2 km3 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 ~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.
KW - Fernpass rockslide cluster
KW - catchment response
KW - lake impact
KW - lake sediments
KW - prehistoric earthquake
KW - progressive slope failure
KW - recurrence rates
KW - rock avalanche
UR - http://www.scopus.com/inward/record.url?scp=85096760928&partnerID=8YFLogxK
U2 - 10.1002/esp.5025
DO - 10.1002/esp.5025
M3 - Article
AN - SCOPUS:85096760928
SN - 0197-9337
VL - 46
SP - 307
EP - 319
JO - Earth Surface Processes and Landforms
JF - Earth Surface Processes and Landforms
IS - 1
ER -