Abstract
High-resolution seismic profiling (12 kHz) surveys combined with sediment cores, radiocarbon dating, tephrochronology and multibeam bathymetry (when available) allow documentation of a range of Holocene mass wasting events in nearby contrasting lakes of volcanic origin in the French Massif Central (45°N, 2°E): two deep maar lakes (Pavin and Chauvet) and a shallow lake (Montcineyre) dammed by the growth of a volcano. In these lacustrine environments dominated by authigenic sedimentation, recent slide scars, acoustically transparent to chaotic lens-shaped bodies, slump deposits or reworked regional tephra layers suggest that subaqueous mass wasting processes may have been favoured by gas content in the sediments and lake level changes. While these events may have had a limited impact in both lakes Chauvet and Montcineyre, they apparently favoured the development of lacustrine meromicticity in maar Lake Pavin along with possible subaerial debris flows resulting from crater outburst events.
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Acknowledgments
The authors would like to acknowledge the MEEDDAT for funding, JL Bourdier (ISTO) for scientific discussions, D. Jézéquel (IPGP Université Diderot, Paris) and master students from Université d’Orléans (2009 and 2010) for their contributions to coring operations and Dr. J. Sitbon and A. Barroca (RES radiology, Orléans) for digital radiographies. The digital elevation model of the Pavin crater was kindly provided by the city of Besse-St-Anataise. The constructive reviews of Stéphanie Girardclos and David Piper improved this paper.
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Chapron, E. et al. (2012). New Evidence of Holocene Mass Wasting Events in Recent Volcanic Lakes from the French Massif Central (Lakes Pavin, Montcineyre and Chauvet) and Implications for Natural Hazards. In: Yamada, Y., et al. Submarine Mass Movements and Their Consequences. Advances in Natural and Technological Hazards Research, vol 31. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2162-3_23
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