Impact of an 0.2 km 3 Rock Avalanche on Lake Eibsee (Bavarian Alps, Germany) – Part II: Catchment Response to Consecutive Debris Avalanche and Debris Flow

Knapp, Sibylle; Anselmetti, Flavio S.; Lempe, Bernhard; Krautblatter, Michael (2021). Impact of an 0.2 km 3 Rock Avalanche on Lake Eibsee (Bavarian Alps, Germany) – Part II: Catchment Response to Consecutive Debris Avalanche and Debris Flow. Earth surface processes and landforms, 46(1), pp. 307-319. Wiley 10.1002/esp.5025

[img]
Preview
Text
KnappEibsee.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (18MB) | Preview

The ~0.2 km3 Eibsee rock avalanche impacted Paleolake Eibsee and completely displaced its waters. This study anal- yses 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 flu- idized 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 sub- aquatic 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 geo- morphology.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Anselmetti, Flavio

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0197-9337

Publisher:

Wiley

Language:

English

Submitter:

Flavio Anselmetti

Date Deposited:

20 Nov 2020 10:15

Last Modified:

23 Jan 2021 01:32

Publisher DOI:

10.1002/esp.5025

BORIS DOI:

10.7892/boris.148305

URI:

https://boris.unibe.ch/id/eprint/148305

Actions (login required)

Edit item Edit item
Provide Feedback