Luiso, Paola (2017) Seismological and gravimetric surveys in Italian active tectonic areas. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: Seismological and gravimetric surveys in Italian active tectonic areas
Creators:
CreatorsEmail
Luiso, Paolapaola.luiso@unina.it
Date: December 2017
Number of Pages: 84
Institution: Università degli Studi di Napoli Federico II
Department: dep20
Dottorato: phd084
Ciclo di dottorato: 30
Coordinatore del Corso di dottorato:
nomeemail
Fedi, Mauriziofedi@unina,it
Tutor:
nomeemail
Paoletti, ValeriaUNSPECIFIED
Date: December 2017
Number of Pages: 84
Uncontrolled Keywords: Geophysics, fault characterization, hazard
Settori scientifico-disciplinari del MIUR: Area 04 - Scienze della terra > GEO/11 - Geofisica applicata
Date Deposited: 19 Dec 2017 14:39
Last Modified: 11 Apr 2019 10:31
URI: http://www.fedoa.unina.it/id/eprint/12054

Abstract

In this thesis, I present a new multiparametric method aimed at investigating the neotectonic activity of three areas of the Apennines characterized by different Quaternary tectonic environments: the Thyrrhenian inner margin of the Southern Apennines, the backbone of the Central Apennines, and the foredeep-foreland at the transition zone between the Southern and Central Apennine belts. The method consists in a multiparametric data analysis in GIS (Geographic Information System) environment which integrates faults, earthquakes and gravimetric lineaments. This is for characterizing the geometry (strike, dip direction, angle and depth) and activity of buried/silent active faults (Massico and San Giuliano di Puglia areas). We used the Monte Bove, Vettore and Paganica capable faults for calibration as they are located along the epicentral areas of the recent seismic sequences of 2009 and 2016, where an outstanding geological and geophysical database is available. The structural setting of the study areas was investigated by performing Multiscale Derivative Analysis (MDA; Fedi, 2002), a valuable tool for identification and interpretation of complex geologic structures (such as faults) with density contrast. This method is especially suitable for detecting and characterizing faults not directly visible at the surface and that were not described before. I analysed the correlation between the earthquakes location and the MDA maxima of the Bouguer anomaly field. To infer the characteristics of active fault planes in the areas with good correlation between the MDA signals and the epicentres, I performed a combined interpretation of 2D re-localized hypocentral sections and the images resulting from the Depth from Extreme Points method (DEXP; Fedi, 2007). So, the chosen study areas are: i) the Paganica and the Mt. Vettore-Mt. Bove areas (central Apennines), hit by 2009 and the 2016 seismic sequences, respectively; ii) the Mt. Massico horst characterized by lower energy seismicity, but clear gravimetric signatures; iii) the San Giuliano di Puglia area (southern Apennines), hit by 2002–2003 seismic sequences. This choice was based either on the areas’ high seismic hazard (for the Paganica and the Mt. Vettore-Mt. Bove areas), and/or on the presence of clear gravimetric signatures, combined with a good knowledge of quaternary geological structures in the complex geodynamic environment of the Apennine chain. In all the cases, both the gravimetric and seismological analyses yielded clear information about the geometry of the fault plains. These good results show the effectiveness of this new multiparametric approach to identify and characterize active (capable or not) structures, known or un-known in literature. In addition, this approach allows revealing if the structure is active along all the fault plain or only partially, and detecting its direction and dip angle. So, it can be successfully employed in areas of the Apennine chain with a high potential hazard with buried and/or silent faults.

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