Upslope migration of snow avalanches in a warming climate.

As a consequence, this transient regime may correspond to the very high activity we documented in the Vosges Mountains during the last decades of the LIA (1825 to 1855) and could have been very short due to the limited altitudinal extent of the mountain range (see next paragraph) and the absence of an increasing trend in precipitation totals at that time ( Fig. 3 ).

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