DETECTION OF NANOSEISMIC EVENTS RELATED TO SLOPE INSTABILITIES IN THE QUARRY DISTRICT OF CORENO AUSONIO (ITALY) — IJEGE
 
 
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DETECTION OF NANOSEISMIC EVENTS RELATED TO SLOPE INSTABILITIES IN THE QUARRY DISTRICT OF CORENO AUSONIO (ITALY)



Abstract:
Nanoseismic monitoring is a passive geophysical technique used to identify and locate weak seismic events (down to local magnitudes, ML, around -3). This technique was applied in the open-pit quarry district of Coreno Ausonio (central Italy) to detect possible gravity-induced slope instabilities resulting from quarry rock blasting. After identifying an active quarry, an engineering-geological survey was carried out to characterise the jointed rock mass on an abandoned wall in front of the quarry. Four main joint sets were surveyed and their geometric and mechanical properties were measured in order to carry out stability analyses that evidenced scarce proneness to failure of the investigated wall. The analysis of seismic records obtained during three monitoring surveys, performed through the NanoseismicSuite software, made it possible to detect and characterise 15 blasts, of which 3 from the reference quarry and 12 from nearby quarries within the district, as well as 27 weak slope instability events (23 collapses and 4 failures). While failures originated from different areas of the quarry district, collapses occurred in a site characterised by an abandoned quarry having a wall more prone to gravity-induced instabilities than the one previously characterised.

Authors:
Matteo Fiorucci - Sapienza Università di Roma - Dipartimento di Scienze della Terra e Centro di Ricerca CERI - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
Roberto Iannucci - Sapienza Università di Roma - Dipartimento di Scienze della Terra e Centro di Ricerca CERI - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
Salvatore Martino - Sapienza Università di Roma - Dipartimento di Scienze della Terra e Centro di Ricerca CERI - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
Antonella Paciello - ENEA - C.R. Casaccia - Via Anguillarese, 301 - 00123 Roma, Italy
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