GEOLOGICAL CONSTRAINTS FOR A CONCEPTUAL EVOLUTIONARY MODEL OF THE SLOPE DEFORMATIONS AFFECTING MT. NUOVO AT ISCHIA (ITALY) — IJEGE
 
 
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GEOLOGICAL CONSTRAINTS FOR A CONCEPTUAL EVOLUTIONARY MODEL OF THE SLOPE DEFORMATIONS AFFECTING MT. NUOVO AT ISCHIA (ITALY)



Abstract:
Ischia Island was the scenario of several Holocene slope instability events occurred at different scales, from shallow mass movements, triggered by meteo-climatic events, up to massive rock slope failures such as large debris avalanches often related to volcano-tectonic dynamics of a resurgent caldera. The present study focuses on the gravitational deformation that involves Mt. Nuovo, located in the western portion of Mt. Epomeo resurgent block, highlighting the complexity of the ongoing slope deformation. A high-resolution engineering-geological model was reconstructed applying a multi-modelling approach supported by field geo-structural evidences and constrained by passive seismic investigations. It revealed a complex morpho-structural setting and led to the identification of a multiple compound mechanism involving a rock mass volume of about 190 million of cubic meters. The obtained geological model shows a partial structural control of the pre-existing tectonic pattern on slope deformation mechanisms, highlighting geometric and volumetric similarities between the Mt. Nuovo ongoing deformation and an already occurred avalanche. The defined conceptual evolutionary model allows to hypothesize the role of inner pressure constraining the shear zone initiation and propagation, assuming as possible a scenario of generalized collapse at Mt. Nuovo. Starting from new field and laboratory data, a numerical modeling will be reconstructed in order to depict the evolution of the gravitational slope deformation, evaluate its sensitivity and constrain future evolutionary instability scenarios.

Authors:
Marta Della Seta - Sapienza Università di Roma – Dipartimento di Scienze della Terra e Centro di Ricerca CERI - Piazzale Aldo Moro, 5 - 00185 Rome, Italy
Carlo Esposito - Sapienza Università di Roma – Dipartimento di Scienze della Terra e Centro di Ricerca CERI - Piazzale Aldo Moro, 5 - 00185 Rome, Italy
Gian Marco Marmoni - Sapienza Università di Roma – Dipartimento di Scienze della Terra - Piazzale Aldo Moro, 5 - 00185 Rome, Italy
Salvatore Martino - Sapienza Università di Roma – Dipartimento di Scienze della Terra e Centro di Ricerca CERI - Piazzale Aldo Moro, 5 - 00185 Rome, Italy
Antonella Paciello - ENEA - C.R. Casaccia - Via Anguillarese, 301 - 00123 Rome, Italy
Cristina Perinelli - Sapienza Università di Roma – Dipartimento di Scienze della Terra - Piazzale Aldo Moro, 5 - 00185 Rome, Italy
Gianluca Sottili - CNR - Istituto di Geologia Ambientale e Geoingegneria (IGAG) - Monterotondo, Italy
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