Fig. 6

Tree-ring based reconstruction of debris-flow activity at Geisstriftbach between AD 1736 and 2007 containing 53 events: 31 events could be identified in a very large number of growth disturbances (bold lines). In contrast, for the 22 events represented with dashed lines, there is good evidence for the existence of events in these years as well, but the reduced number of trees available for analysis did not allow for them being considered events with equal confidence. Sample depth (i.e., the number of increment cores, wedges and cross-sections available for analysis) is given with a solid line on top of the frequency