Detachment depth revealed by rollover deformation: An integrated approach at Mount Etna

Researchers have determined that the unstable NE flank of Mount Etna is underlain by an east-dipping rotational detachment fault at approximately 4 km below the surface, a finding supported by both short-term InSAR observations and long-term geological data. This study provides a novel, multidisciplinary approach to constrain the depth and geometry of detachment faults in volcanic flanks, which are critical for understanding flank instability—a common yet poorly constrained phenomenon. By analyzing trapdoor subsidence patterns from 1995–2008, the team linked deformation to rotational movement along this detachment, forming a rollover anticline against the NE Rift. The depth estimate aligns with seismic activity clusters, reinforcing the model's validity. This integrated method, combining InSAR and structural data, offers a scalable framework for studying other volcanoes experiencing instability or unrest.

Ruch, J., Acocella, V., Storti, F., Neri, M., Pepe, S., Solaro, G., & Sansosti, E. (2010). Detachment depth revealed by rollover deformation: An integrated approach at Mount Etna. Geophysical Research Letters, 37(16). Portico. https://doi.org/10.1029/2010gl044131