Landslide; spatial activity; dendrogeomorphology; event-response index; treering

Dendrogeomorphic methods enable a very accurate reconstruction of spatio-temporal landslide behaviour. Unfortunately, existing approaches of spatial reconstruction suffer from many imperfections (e.g. dependence on tree age or impact of forest management). This study developed, presented, and tested a new approach for the spatial reconstruction of landslide movements based on tree-ring data that eliminates the mentioned problems. The new spatial event-response index (SIt), developed for GIS, follows the logic of the standard event-response index used for the expression of chronological landslide behaviour and considers the uneven spatial pattern of trees. The main advantage of the new approach is in the consideration of the position of disturbed trees but also of undisturbed ones.