GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 2.2 333 Seismic Microzonation (Level 3) of Santa Lucia and Capitignano (Abruzzo Region): first results and considerations D. Berti 1 , E. Chiarini 1 , V. D’Andrea 2 , F. Durante 2 , E. La Posta 1 , L. Macerola 2 , M. Nocentini 3 , D. Palucci 2 , S. Silvestri 1 , M. Tallini 2 1 ISPRA-Dipartimento per il Servizio Geologico D’Italia, Roma, Italy 2 Dipartimento di Ingegneria Civile, Edile-Architettura e Ambientale (DICEAA), Università dell’Aquila, Italy 3 Dipartimento di Scienze, Università di RomaTre, Italy Introduction. The August 24, 2016 Mw 6.0 Central Italy earthquake, which has hit the Ascoli Piceno and Rieti provinces, has caused damages up to the northern L’Aquila Province. Indeed, damages were recorded at Santa Lucia village (municipality of Montereale) (I MCS = 6). The Capitignano territory, even if was assigned a macroseismic intensity (I MCS ) equal to 5, is placed in the Quaternary Montereale basin characterised by several Seismic Hazard issues, such as surface active faulting, landslides (specifically debris flow and rock mass fall) and liquefaction (Gruppo di Lavoro INGV sul terremoto di Amatrice, 2016). Moreover, the Quaternary Montereale basin is the nearest Quaternary basin to the epicentral area of the August 24, 2016 earthquake. So that the Civil Protection Department involved ISPRA and DICEEA (L’Aquila University) for the Seismic Microzonation (Level 3) of Santa Lucia and Capitignano territory, including also Paterno and Piedicolle areas, to be used as prototype for the Abruzzo Region (Figs. 1 and 2). Despite the distance from the epicenter, the serious consequences recorded in Santa Lucia could hypothetically depend by morphological and lithostructural seismic site effect considering obviously also the level of the building vulnerability. The Capitignano territory is placed on a intramontane basin (Montereale basin) whose Quaternary evolution is controlled by the Capitignano and the S. Giovanni potentially active normal faults (Chiarini et al. , 2014). Although none of the nine villages of the Capitignano municipality has had relevant damages, the amplification effects due to the basin sedimentary infill as well as the presence of two faults with Quaternary activity and earthquake prone landslides and liquefaction areas generate a relevant Seismic Hazard and are issues to be carefully analysed in the Seismic Microzonation (Level 3) prototype. In recent years the Department of the Geological Survey of Italy - ISPRA covered both areas with geological surveys at a 1:10,000 scale for the 348Antrodoco sheet of the official geological map. The yet unpublished results of these surveys are the starting point of the study of the Seismic Microzonation (Level 3) of Santa Lucia and Capitignano. Moreover, we took into account geological mapping such as the Seismic Microzonation (Level 1) (Abruzzo Region) of the municipalities of Capitignano and Montereale. Geological setting. ��� ����� The Santa Lucia and Capitignano villages lie along the tectonically active axial belt of the Apennine chain (northern Abruzzi, Central Italy), in a sector characterized by intense historical and instrumental seismic activity. They are placed at the Fig. 1 – Location map of Santa Lucia village.