Lake Pavin History, geology, biogeochemistry, and sedimentology of a deep meromictic maar lake

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and seiche by resonance on lake edges. One of these excep-
tional storms and fl ooding events was reported in Auvergne
around 580 AD (Vernet 2013 ), which may coincide with the
slump of this age reported by Chapron et al. ( 2010a ).

Recurrent fl ooding events and the doubling of the back-

ground sedimentation rate since the early Middle Ages have

been reported from the lake Aydat 27 km NE of Pavin

(Lavrieux et al. 2012).

Fig. 9.9 Map of the Lake Pavin maar rim showing six categories of
unstable areas: (1) Unstable slopes, (2) Potentially unstable slopes; (3)
Relatively slow and small-sized slope processes, (4) Geomorphic
anomalies suggesting slow but deep seated rotational landslide and/or

collapse mass; (5) Potentially unstable subaquatic areas (Chapron et al

2010a , Henriet 2009 ); (6) Rims showing apparently very small or very

slow slope processes

9 Geomorphology of Lake Pavin Surroundings