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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 ( IF 2.8 ) Pub Date : 2020-11-16 , DOI: 10.1002/esp.5025
Sibylle Knapp 1 , Flavio S. Anselmetti 2 , Bernhard Lempe 3 , Michael Krautblatter 1
Affiliation  

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.

中文翻译:

0.2 km 3 岩石雪崩对艾布湖(德国巴伐利亚阿尔卑斯山)的影响——第二部分:集水区对连续碎屑雪崩和碎屑流的响应

约 0.2 平方公里的 Eibsee 岩石雪崩影响了 Paleolake Eibsee 并完全取代了其水域。本研究分析了湖泊的影响和后果,以及集水区对滑坡的反应。准 3D 地震反射勘测、来自现代艾布湖的四个沉积岩心深入岩崩体、九个放射性碳年龄和地貌分析使我们能够将主要岩崩事件与次生岩崩和泥石流区分开来。高度流化的碎屑雪崩形成了一个巨浊积岩和多个斜坡,记录在湖泊沉积物中。Eibsee 岩石雪崩的新校准年龄约为 4080-3970 cal yr BP,表明与 Fernpass 群中的岩石滑坡和皮堡湖和攀时湖的水下滑坡重合,并增加了区域性大地震引发这些事件的可能性。我们记录了 Eibsee 湖侵蚀和沉积的复杂历史,并展示了如何通过地球物理学、沉积学、放射性碳测年和地貌学的互补应用来揭示该湖的集水区响应和再生。
更新日期:2020-11-16
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