Abstract
Here we report on a recent survey undertaken on Lake Le Bourget (NW Alps, France) using a multibeam echosounder mounted on a portable and shallow-draft platform. The 3.6 × 2.8 m survey platform can be transported from one lake to another and deployed within a few hours. Its shallow draft allows surveying in areas as shallow as 3 m, while the multibeam echosounder allows maximum sounding depths of 500 m. The collected data have allowed identifying two main areas of the lake affected by mass movements. In the northwest sector of the lake, a large mass wasting deposit of 1.8 km2 is found at the base of a very steep slope. This large deposit may be correlated with a major late-glacial mass-wasting event that triggered a seiche in Lake Le Bourget. To the north of this deposit a mass-wasting deposit is interpreted to have been caused by the AD 1822 earthquake. In the southeast sector of the lake, many lobes and a large mass wasting deposit are reported for the first time. The presence of gas-rich sediments in this area has prevented acoustic penetration and thus their identification during previous seismic surveys. The occurrence of mass movements is correlated with interflow deposition zones. In addition to the mass movements, a series of collapse craters are identified in the northern sector of the lake. These collapse craters are located near the head scars of an incipient slide. Considering that earthquakes are common in the region and can cause liquefaction within the lake sediments, there is a possibility that this incipient slide may further develop and eventually generate a massive (>107 m3) slide.
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References
Allen JRL (1982) Sedimentary Structures: Their Character and Physical Basis. Elsevier, Amsterdam.
Arnaud F, Revel M, Chapron E et al (2005) 7200 years of Rhone river flooding activity in Lake Le Bourget, France: a high-resolution sediment record of NW Alps hydrology. Holocene 15:420–428.
Beck C, Manalt F, Chapron E et al (1996) Enchanced seismicity in the early post-glacial period: evidence from the post-Würm sediments of Lake Annecy, northwestern Alps. J Geodyn 22:155–171.
Bravard JP (1987) Le Rhone: Du Léman à Lyon. La Manufacture, Lyon.
Chapron E (1999) Contrôle climatique et sismo-tectonique de la sédimentation lacustre dans l'Avant-Pays Alpin (Lac du Bourget) durant le Quaternaire récent. Géologie Alpine, Mémoire H.S. 30.
Chapron E, Van Rensbergen P, Beck C et al (1996) Lacustrine sedimentary record of brutal events in Lake Le Bourget (Northwestern Alps-Southern Jura). Quaternaire 7:155–168.
Chapron E, Beck C, Pourchet P et al (1999) 1822 earthquake-triggered homogenite in Lake Le Bourget. Terra Nova 11:86–92.
Chapron E, Desmet M, De Putter T et al (2002) Climatic variability in the northwestern Alps, France, as evidenced by 600 years of terrigenous sedimentation in Lake Le Bourget. Holocene 12:177–185.
Chapron E, Van Rensbergen P, De Batist M et al (2004) Fluid-escape features as a precursor of a large sublacustrine sediment slide in Lake Le Bourget, NW Alps, France. Terra Nova 16:305–311.
Chapron E, Arnaud F, Noël H et al (2005) Rhone river flood deposits in Lake Le Bourget: a proxy for Holocene environmental changes in the NW Alps, France. Boreas 34:404–416.
Fanetti D, Anselmetti FS, Chapron E et al (2008) Megaturbidite deposits in the Holocene basin fill of Lake Como (Southern Alps, Italy). Palaeogeogr Palaeoclimatol Palaeoecol 259: 323–340.
Guyard H, Chapron E, St-Onge G et al (2007) High-altitude varve records of abrupt environmental changes and mining activity over the last 4000 years in the Western French Alps (Lake Bramant, Grandes Rousses Massif). Quat Sci Rev 26:2644–2660.
Mulder T, Cochonat P (1996) Classification of offshore mass movements. J Sediment Geol 66:43–57.
Nisbet EG, Piper DJW (1998) Giant submarine landslides. Nat 392:329–330.
Rothwell RG, Thomson J, Kähler G (1998) Low-sea-level emplacement of a very large Late Pleistocene ‘megaturbidite’ in the western Mediterranean Sea. Nat 392:377–380.
Schnellman M, Anselmetti FS, Giardini D et al (2002) Prehistoric earthquake history revealed by lacustrine slump deposits. Geol 30:1131–1134.
Siegenthaler C, Finger W, Kelts K et al (1987) Earthquake and seiche deposits in Lake Lucerne, Switzerland. Eclogae Geologica Helvetiae 80:241–260.
Thouvenot F, Frechet J, Guyoton F et al (1990) SISMALP: an automatic phone-interrogated seismic network for the western Alps. Cahiers du Centre Européen de Géodynamique et de Séismologie 1:1–10.
van Rensbergen P, De Batist M, Beck C et al (1999) High-resolution seismic stratigraphy of glacial to interglacial fill of a deep glacigenic lake: Lake Le Bourget, Northwestern Alps, France. Sediment Geol 128:99–129.
Acknowledgments
We thank Jean-Guy Nistad and Thierry Schmidt of the Centre interdisci-plinaire de développement en cartographie des océans (CIDCO), Dr. Fabien Arnaud, Emmanuel Malet and Bernard Fanget from the Laboratoire des Environnements Dynamiques et Territoire de Montagnes (EDYTEM) of the Université de Savoie for their help and technical assistance during the surveys and Gerard Paolini from The Communauté d'Agglomération du Lac du Bourget (CALB) for providing the CTD data. This project was funded by the Agence Nationale de la Recherche (ANR, France) under the PYGMALION program. We also thank Marc de Batist and Flavio Anselmetti for their constructive review of the manuscript.
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Ledoux, G., Lajeunesse, P., Chapron, E., St-Onge, G. (2010). Multibeam Bathymetry Investigations of Mass Movements in Lake Le Bourget (NW Alps, France) Using a Portable Platform. In: Mosher, D.C., et al. Submarine Mass Movements and Their Consequences. Advances in Natural and Technological Hazards Research, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3071-9_35
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DOI: https://doi.org/10.1007/978-90-481-3071-9_35
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