Applying geophysical techniques to investigate a segment of a creeping fault in the urban area of San Gregorio di Catania, southern flank of Mt. Etna (Sicily — Italy)

In an especially built-up area, such as the lower slopes of Etna volcano, the effects of surface faulting, caused by coseismic ruptures and aseismic creep, contribute significantly to increase the risk to towns and villages and their related infrastructure. This study aims to couple the geophysical...

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Bibliographic Details
Published in:Journal of applied geophysics 2015-12, Vol.123, p.153-163
Main Authors: Imposa, S., De Guidi, G., Grassi, S., Scudero, S., Barreca, G., Patti, G., Boso, D.
Format: Article
Language:English
Subjects:
Fault creep
Fault zone
GPR
Mt. Etna
ReMi
Seismic tomography
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Summary:In an especially built-up area, such as the lower slopes of Etna volcano, the effects of surface faulting, caused by coseismic ruptures and aseismic creep, contribute significantly to increase the risk to towns and villages and their related infrastructure. This study aims to couple the geophysical and structural characteristics of an active fault zone, joining surficial and deep information, in the area of San Gregorio di Catania (Sicily — Italy). The occurrence of this structure and its associated fracture field were related to variations in the physical and mechanical properties of the hosting rocks. Surface structural survey detected a fracture zone with maximum width of 40m, characterized with fractures oriented consistently with the kinematics of the fault. The geophysical surveys (ground penetrating radar, seismic tomography, and refraction microtremor), enabled to detect highly fractured rock volumes at variable depth whose occurrence has been linked to the presence of the fault at surface. The integration of various techniques, with different spatial resolution and depth range, allowed to fully reconstruct the 3D geological structure of the site down to about 15m. •A creeping fault on Mt. Etna volcano (Italy) heavily affects an urban area.•We performed structural survey and applied several geophysical techniques across fault.•Ground penetrating radar, seismic tomography, and refraction microtremor were performed.•Integration of results allows reconstruction of the 3D structure of the fracture zone.
ISSN:0926-9851
1879-1859
DOI:10.1016/j.jappgeo.2015.10.008