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Complex ground deformation of the 2016 Mw 6.5 central Italy earthquake influenced by the geological structures and seismicity distribution

Authors

Porreca,  Massimiliano
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Carboni,  Filippo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

De Luca,  Claudio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Occhipinti,  Martina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Valerio,  Emanuela
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ercoli,  Maurizio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Barchi,  Massimiliano
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Porreca, M., Carboni, F., De Luca, C., Occhipinti, M., Valerio, E., Ercoli, M., Barchi, M. (2023): Complex ground deformation of the 2016 Mw 6.5 central Italy earthquake influenced by the geological structures and seismicity distribution, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4384


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021815
Abstract
The 2016 Mw 6.5 earthquake struck a large region of the Apennines in central Italy and produced impressive and complex surface ruptures. These ruptures were investigated and mapped by field geologists for years after the earthquake thanks also the use of remote sensing data. Here we present detailed maps of the ground deformation pattern produced by the Vettore normal fault activated during the Mw 6.5 mainshock, using Differential Synthetic Aperture Radar Interferometry. The DInSAR analysis has been retrieved from ALOS-2 SAR data, via the Parallel Small BAseline Subsets (P-SBAS) algorithm. At the local scale, we automatically identify many surface ruptures, most of which already observed in the field. At the large scale, we trace a set of five geological cross-sections to inspect a possible link between the coseismic vertical displacement, the lithology distribution and the tectonic structures of the area (i.e., thrusts, normal faults). On these sections, we also project the seismicity distribution recorded during October 2016.The integration of such datasets allows the recognition of an important geological control in the overall distribution of the deformation, which shows maximum values in correspondence of the carbonatic multilayer and minimum values within the clastic succession. The distribution of seismicity allows also us to distinguish seismogenic by aseismic slip associated with fault ruptures.The results of this work demonstrate that the integration of surface geology, remote sensing data and seismicity, can lead to a better understanding of the influence of geological structures on the distribution of the ground deformation associated with earthquakes.