Giandomenico Fubelli

Constraining primary surface rupture length along the Paganica fault (2009 L’Aquila earthquake) with geological and geodetic (DInSAR and GPS) data

Part of this work has been carried out within the ASI-SIGRIS project, funded by the Italian Space Agency and Istituto Nazionale di Geofisica e Vulcanologia

A GIS-based approach for estimating volcaniclastic flow susceptibility: a case study from Sorrentina Peninsula (Campania Region)

With the aim to improve volcaniclastic flows hazard zonation and risk mitigation in volcanic areas, this work presents a GIS-based study on the Sorrentina Peninsula, located southwest of the main Neapolitan volcanoes (Ischia, Procida, Campi Flegrei, and Somma-Vesuvius; Campanian Plain, Southern Italy). This area has beenheavily affected by historical events with more than 200 volcani-clastic flows recorded in the last 500 years. The study here proposed combines different information, including morphometry, geology, volcanology and land use for building a susceptibility index (named VFSI) able to rank the drainage basins potentially prone to generate volcaniclastic flows. The resulting susceptibility map classifies 488 drainage basins into three different classes (low, moderate and high) over an area of about 280 km2. The proposed method allows the rapid ranking of the different drainage basins, and is propaedeutic to detailed investigation on single basins for individuating areas more prone to colluvial cover failure and associated volumes of available material for volcaniclastic flow generation.

Active and capable fault? The case study of Prata D'Ansidonia (L'Aquila, Central Apennine)

The study deals with the morphogenetic meaning of several linear scarps that carved the paleo-landsurface of Valle Daria, an extended geomorphological feature located between Barisciano (AQ) and Prata DAnsidonia (AQ). These villages are situated in the southern termination of the LAquila intermontane basin (one of the largest basin of the central Apennines), nearby the epicentral area of the 6th April 2009 earthquake (Mw 6.1). These scarps, up to 3 meters high and up to 1.5 km long, define narrow/elongated flat-bottom depressions, filled by colluvial deposits. These depressions are carved into fluvial-deltaical conglomerates, dated back to the lower Pleistocene. Even if different authors have interpreted these shapes as a paleodrainage or secondary faults, a morphometrical study of the Valle Daria paleo-landsurface provided several information which cast doubt on these two interpretations. In order to better understand the nature and the state of activity of these lineaments, geological, geomorphological and geophysical surveys were carried out. A paleoseismological trench pointed out two events of deformation. The curvilinear shape of the shear plane seems to be related to a slow deformation, attributable to collapse-phenomena. Three GPR profiles, two ERT profiles and two microgravimetrical profiles seem to corroborate this interpretation. Therefore this study permits to attribute the genesis of these scarps to tectono-karstic phenomena, excluding the presence of an active and capable fault.