Inversion of Short‐Period Seismic Signals as a Tool to Understand Small‐Volume Rockslide Mechanics: The Case Study of the 26 January 2023, Lorgino (Crevoladossola, NW Italy) Rockslide

Abstract A small‐volume 6,000 m 3 rockslide struck the Lorgino hamlet of Crevoladossola (NW Italy) just before 23:00 UTC on 26 January 2023, at the boundary of a nearby marble quarry. The rockslide severely damaged the mining infrastructure and halted operations for months, fortunately without causing injuries or casualties. An on‐site seismic array, previously installed to monitor the quarry activity, recorded neatly the rockslide signal. We analyzed this complex 15‐s signal, using a 3D force‐time function approach. By combining seismic inversion results with ad‐hoc geomechanical analysis and detailed photogrammetric surveys, we gained a comprehensive understanding of the ongoing rockslide mechanisms. Our results link waveform properties to single‐force inversion results, providing new insights into the dynamics and energy‐transfer mechanisms of the rockslide. The first sliding mass governs low‐frequency seismic radiation, while higher‐frequency signals (up to 5 Hz) are generated by individual blocks or late block clusters. The integrated approach, applied for the first time on our knowledge at such a small scale revealed the potentiality of these combined tools for rockslide monitoring and hazard mitigation.