GNGTS 2017 - 36° Convegno Nazionale

94 GNGTS 2017 S essione 1.1 Davis G.H. & Lister, G.S., 1988; Detachment faulting in continental extension: perspectives from the southwestern U.S. Cordillera . In: Clark, S.P. Jr., Burchfiel, B.C. & Suppe, J. eds) Processes in Continental Lithospheric Deformation. Geological Society of America, Special Papers, 218, 133–159. Smith S.A.F., R.E. Holdsworth, C. Collettini & J. Imber, 2007; Using footwall structures to constrain the evolution of low-angle normal faults , J. Geol. Soc., London, 164, 1187-1191. Smith S.A.F., Collettini, C. & Holdsworth, R.E. 2008; Recognizing the seismic cycle along ancient faults: CO2- induced fluidization of breccias in the footwall of sealing low-angle normal fault , J. Struc. Geol., 30, 1034-1046, doi:10.1016/j.jsg.2008.04.010. Smith S.A.F., Faulkner, D.R., 2010; Laboratory measurements of the frictional properties of a natural low-angle normal fault: The Zuccale fault, Elba Island, Italy . J. Geoph. Res., 115, B02407. PS-INSAR DATA ANALYSIS: GROUND DEFORMATION IN PRE-SEISMIC PERIOD IN THE L’AQUILA 2009 EARTHQUAKE REGION S. Nardò 1 , A. Ascione 2 , S. Mazzoli 2 , C. Terranova 3 , G. Vilardo 4 1 Dottorato in Scienze della Terra, dell’Ambiente e delle Risorse, Università Federico II, Napoli, Italy 2 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università Federico II, Napoli, Italy 3 Responsabile delegato Ufficio del Piano Straordinario di Telerilevamento, MATTM, Roma, Italy 4 Istituto Nazionale di Geofisica e Vulcanologia, INGV, Sezione di Napoli Osservatorio Vesuviano, Napoli, Italy Introduction. In the last decades, the development and growing use of new techniques, e.g. those based on satellite based information, has allowed the acquisition of huge amounts of data of unprecedented accuracy that permit not only identification but also quantification of millimetre-scale deformation of the Earth’s surface. Among such techniques, those related to the use of radar orbiting satellites (SAR) are particularly suited to the detection of the vertical component of ground motions, thus being fit to the identification of areas affected by landsliding, subsidence/uplift phenomena, etc. With the aim of identifying unstable areas over the whole Italian territory, in 2007 the MATTM (Italian Ministry of the Environment), in the framework of the Piano Straordinario di Telerilevamento Ambientale (Special Plan of Remote Sensing of the Environment), started collecting and developing a set of information layers, including SAR satellite interferometric data (InSAR) by InSAR data processing. Through time, the MATTM website (Geoportale Nazionale - Roma) implemented a powerful interferometric database, which provides an “Extraordinary Environmental Remote Sensing Plan” (PST-A) as a support to Italian administrative regions (Costantini et al. , 2017), and to date is a unique achievement in the European context. In recent years, growing interest has been placed on the use of satellite-based data analyses aimed at the detection andmonitoring of groundmotions associatedwith seismicity. In particular, the accuracy of the millimetre measurements so far realized by the C, X and L banded SAR systems and the multi-temporal analysis methodologies (DInSAR - PSInSAR) have provided impressive images of both coseismic and post-seismic (e.g., Atzori et al. , 2009; Cheloni et al. , 2017) surface modifications in areas affected by strong earthquakes. Such information bears crucial constraints to the geometric and kinematic features of earthquake generating faults. On the other hand, the interferometric PST-A archive retains the millimetre ground deformation data that could be the most important marker of accumulation of crustal seismogenic stress. Such a dataset provides fundamental information on the pre-seismic phase of moderate to strong earthquakes that have hit Italy in recent years (e.g., Lanari et al. , 2010; Liu et al. , 2010; Luo et al. , 2014; Petricca et al. , 2015; Moro et al. , 2017). By these works, the ground deformation pattern predating the main shock of some months is very well imaged, while much less clear is the pre-seismic displacement pattern on a yearly scale. Our study focuses on pre-seismic ground deformation in the 2009 L’Aquila earthquake, which was characterised by a normal faulting mechanism (e.g., Chiarabba et al. , 2009). Coseismic