| 31 Mar 2026
The multitemporal landslide inventory map of the Collazzone study area, central Italy
Abstract. Multitemporal landslide inventory maps are an essential source of information for many research and applications. This type of landslide map provides information for analyzing the spatial and temporal distribution of the landslides, their potential interaction with the built environment, their contribution to landscape dynamics, and their response to the triggers over time. The acquisition of the temporal information of landslide evolution provides a fundamental step for hazard evaluation. Despite the essential value of multitemporal landslide inventory maps, their dissemination is rare. This is due to the time-consuming nature of their preparation. In this paper we present the multitemporal landslide inventory map for a 79 km2 area in the Umbria region (central Italy). The inventory contains more than 3,500 landslides classified according to relative age, type of movement, and estimated depth. The landslide mapping was carried out by interpreting stereoscopic aerial photographs taken in 1941, 1954, 1977, 1985, and 1997, as well as stereo satellite images taken in 2010, 2013, and 2014. The inventory was further updated through several field checks conducted in 1999, 2004, 2005, and 2020, and by interpreting the images available on Google Earth (2011, 2012, 2015, 2015, 2015, 2019, 2021, 2022 and 2023). Landslides were mapped according to rigorous and reproducible criteria applied by a team of expert geomorphologists. The dataset consists of a digital archive including twenty-nine layers, that is available at https://doi.org/10.5281/zenodo.18980281.
The manuscript presents a comprehensive (counting over 3,500 landslides) multi-temporal landslide inventory for the Collazzone area (central Italy), covering more than 80 years of observations derived from different datasets.
The long-term continuity of the dataset, the rigorous mapping procedures, and the integration of heterogeneous sources make this inventory a valuable contribution for hazard assessment, geomorphological analysis, and landscape evolution studies. Overall, the work is scientifically solid, methodologically robust, and highly useful for the community. Only minor revisions are needed to improve clarity, readability, and metadata completeness.
MAIN COMMENTS
MINOR ISSUES
LINE 8: Replace with “multi-temporal” and ensure consistency throughout the text.
LINE 10: Clarify the meaning of “the build environment”; do you refer to infrastructures or the built environment more broadly?
LINE 33: “Vintages” may not be the most appropriate term; consider rephrasing.
LINE 55: Correct “(Bhutyan et al., 2023a)”.
LINE 58: The study area should be explicitly mentioned here and also in the abstract.
LINES 75–77: Consider anticipating the age information as “Plio-Pleistocene continental gravel, sand and clay”.
EQUATION 1: Replace “con” and correct the condition to 0 ≤ E ≤ 1.