GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 2.2 405 References Bordoni P., Del Monaco F., Milana G., Tallini M., Haines J.; 2014: The Seismic Response at High Frequency in Central L’Aquila: A Comparison between Spectral Ratios of 2D Modeling and Observations of the 2009 Aftershocks . Bulletin of the Seismological Society of America, 104 (3), 1374-1388, doi: 10.1785/0120130230. Clementi A., Piroddi E.; 1986: L’Aquila. Laterza, Roma-Bari. Del Monaco F., Tallini M., De Rose C., Durante F.; 2013: HVNSR survey in historical downtown L’Aquila (central Italy): site resonance properties vs. subsoil model . Engineering Geology, 158 , 34-47. Gruppo di Lavoro MS–AQ; 2010: Microzonazione sismica per la ricostruzione dell’area aquilana . Regione Abruzzo – Dipartimento della Protezione Civile, L’Aquila, 3 vol., Cd-rom. Nocentini M., Tallini M., Cosentino D., Gliozzi E., Asti R., Durante F., Macerola L.; 2016: Plio-Quaternary geological map of the L’Aquila-Scoppito Basin (central Italy) . ����� ������ ���� ����� ���� ������ ���� Rend. Online Soc. Geol. It., 40(1), 329. Nocentini M.; 2016: Integrated analysis for intermontane basins studies: tectono-stratigraphic and paleoclimatic evolution of the L’Aquila Basin . PhD thesis in Environmental and Resources Geology, University of Roma Tre (XXVII cycle). Tallini M., Durante F., Macerola L., Nocentini M.; 2016a: Does a seismic double-resonance affect L’Aquila historical downtown buildings? Rend. Online Soc. Geol. It., 40(1), 685. Tallini M., Durante F., Macerola L., Nocentini M.; 2016b: Up-to-date L’Aquila town subsoil model for seismic site and hazard evaluation: boreholes and single station microtremor data to investigate the Pettino Fault . Rend. Online Soc. Geol. It., 40(1), 686. Tertulliani A., Arcoraci L., Berardi M., Bernardini F., Camassi R., Castellano C., Del Mese S., Ercolani E., Graziani L., Leschiutta I., Rossi A., Vecchi M.; 2011: An application of EMS98 in a medium-sized city: the case of L’Aquila (Central Italy) after the April 6, 2009 Mw 6.3 earthquake . Bulletin of Earthquake Engineering, 9 , 67–80. New data for the subsoil model of L’Aquila: implications for the seismic site response and the seismic hazard evaluation M. Tallini 1 , F. Durante 1 , L. Macerola 1 , M. Nocentini 2 1 Dipartimento di Ingegneria Civile, Edile-Architettura e Ambientale, Università degli Studi dell’Aquila, Italy 2 Dipartimento di Scienze, Università degli Studi di Roma Tre, Italy Introduction. Boreholes data and geophysical investigations are absolutely basic for the seismic site response to constrain the subsoil model of urban areas, due to the presence of buildings and anthropic cover. But, the seismic site response is a useful tool to mitigate the seismic risk above all of urban areas hit by recent earthquake as in the case of L’Aquila town. So, our goal has been to update the subsoil model of L’Aquila town through several hundreds of borehole logs and single station microtremor recordings which have been integrated with geological observations in L’Aquila town and its neighbourhood. Boreholes were carried out above all for the building reconstruction activities started after the L’Aquila earthquake of April 6, 2009. Geological and microtremor data were acquired for research purposes and specific projects (Del Monaco et al. , 2013; Gruppo di Lavoro MS–AQ, 2010; Nocentini, 2016). A fine scale geological mapping, borehole and microtremor data were organised into a GIS database which made our elaborations easier. Furthermore, the investigation of the subsoil model regards also the crossing in L’Aquila town of the Pettino Fault or its splay faults. This fault is considered active (Galli et al. , 2011), so this investigation implies also an updated seismic hazard evaluation of L’Aquila town. The updated subsoil model of L’Aquila town. The preliminary results allowed to recognize in L’Aquila town two distinct zones characterised by different subsoil models which are put beside roughly along a probable south-eastward splay of the Pettino Fault (SSPF) (Nocentini et al. , 2016; Tallini et al. , 2016b) (Fig. 1). The subsoil model of the northern zone consists of 20-30 thick of middle Pleistocene L’Aquila breccia (CMA Synthem) laying upon Meso- Cenozoic limestones (CRP and SLB units). The southern zone is characterised by 60-100 m