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Convegno Annuale Dei Progetti Sismologici Abstracts Convenzione-Quadro tra Dipartimento della Protezione Civile e Istituto Nazionale di Geofisica e Vulcanologia Triennio 2007-09 Convegno annuale dei progetti sismologici Sala convegni del Rettorato - Università Roma Tre, Via Ostiense 159, Roma 19-21 Ottobre 2009 Abstracts 1 Session L’Aquila Earthquake Sequence Strong Ground Motion Characteristics from the 6 April 2009 L’Aquila earthquake, Italy. 1Aybige Akinci, 1Luca Malagnini and 2Fabio Sabetta 1) Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma- Italy 2) Dipartimento della Protezione Civile, Via Vitorchiano 4, 00189 Roma, Italy Abstract The April 6, 2009 earthquake occurred at 03:33 a.m. local time, magnitude Mw=6.3, in the Abruzzo region (Central Italy), close to the city of L’Aquila (67000 inhabitants), located at about 5 km northeast to the epicenter. The main shock has been recorded by fifty-eight accelerometric stations the highest number of digital recordings ever obtained in Italy for a single earthquake; this makes the Abruzzo event one of the best recorded earthquakes caused by a normal fault mechanism. Very high values of peak ground acceleration were recorded near L’Aquila town centre (5 stations at zero distance from the fault) with a station reaching at 0.63g value. The earthquake caused severe losses (299 victims and1500 injured) and damages (about 18000 unusable buildings) in the epicentral area. In this study, we aim discussing the issues related to the earthquake engineering applications and implications of the recorded ground motion. Therefore, we analyze the ground motion characteristics of both the main shock in terms of peak ground acceleration (PGA), peak ground velocity (PGV) and pseudo-acceleration response spectra (5% of damping ratio). In particular, we compare the 5% damped pseudo-acceleration response spectra with the EC8 design spectrum and the new Italian building code (NTC08). In order to understand the ground motion characteristics of the L’Aquila earthquake better, we also study the site response of the strong motion stations that recorded the Aquila seismic sequence. The spectral ratio and H/V procedures were applied to all the events for which the strong-motion recordings are available. Evaluation of the local site effects in the middle Aterno valley Ameri G.1, Augliera P.1, Azzara R.M.1, Bergamaschi F.1, Bordoni P.1, Cara F.1, Cogliano R.1, Cultrera G.1, D’Alema E.1, Di Giacomo D.4, Di Giulio G.1, Fodarella A.1, Franceschina G.1, Gallipoli M.R.2, Harabaglia P.3, Ladina C.1, Lovati. S.1, Luzi L.1, Marzorati S.1, Massa M.1, Milana G.1, Mucciarelli M.3, Pacor F.1, Parolai S.4, Picozzi M.4, Pilz M.4, Puglia R.1, Pucillo S.1, Riccio G.1 1Istituto Nazionale di Geofisica e Vulcanologia; Sezioni di Milano-Pavia, Roma1, Centro Nazionale Terremoti; [email protected], [email protected] 2IMAA-CNR, C. da S. Loja, Tito Scalo (PZ) 3DiSGG-Università della Basilicata, V.le Ateneo Lucano, Potenza 4Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germania The day after the April 6th, 2009, L’Aquila earthquake (Mw 6.3) and for more than one month, about 30 sites have been monitored with accelerometers and velocimeters to study the local site effects in the middle Aterno valley. The installation was carried out by several research institutions, including Istituto Nazionale di Geofisica e Vulcanologia (Italy), Università della Basilicata (Italy) and GFZ-Potsdam (Potsdam, Germany). The stations have been installed nearby or inside the most damaged villages, where the macroseismic intensity reached the IX/X MCS degree (i.e. Onna, Paganica, Poggio Picenze, etc.) and where coseismic surface effects have been observed. The seismic stations have been installed in free-field or inside buildings. In particular, the accelerometric sensors have been used to record the largest aftershocks and to evaluate the possible presence of nonlinear effects. The huge amount of collected data allows the estimation of the local amplification phenomena through empirical techniques, such as the horizontal to vertical spectral ratios for a single station (HVSR) or the spectral ratio between the horizontal (or vertical) components of the selected site and a reference site (SSR). The preliminary results of this study indicate that the villages located in the middle Aterno valley suffered relevant local amplifications at frequencies generally higher than 1 Hz, so that the large observed damage can be in part ascribed to local site effects. Characteristics of strong ground motions recorded during the April 2009 L’Aquila (central Italy) seismic sequence G. Ameri1, M.Massa1, D. Bindi1, E. D'Alema1, A. Gorini2, L. Luzi1, S. Marzorati1, F.Pacor1, R. Paolucci3, R.Puglia1 and C.Smerzini4 1INGV Milano – Pavia, Milan, [email protected] 2Dipartimento della Protezione Civile - Ufficio Valutazione, Prevenzione e Mitigazione del Rischio Sismico (SISM), Rome 3 Department of Structural Engineering, Politecnico di Milano, Milan, Italy 4 PhD student, Rose School, Pavia, Italy The 6 April 2009 L’Aquila MW 6.3 earthquake and its aftershocks yielded the most extensive set of strong-motion data in the near-source region yet obtained in Italy. The mainshock was recorded by 56 strong-motion stations belonging to the RAN, with 19 of these located within 50 km of the surface projection of the fault. The available data set is composed of more than 300 three-components strong-motion records from Mw ≥ 4 events recorded by RAN and INGV MI-PV stations, with about 90 records within 50 km of the corresponding epicenters. The strong ground motions from the mainshock show a clear dependence on azimuth, that can be attributed both to source effects (i.e., directivity effects) and to different attenuation properties of seismic waves at crustal scale (as suggested by the peak acceleration maps from the two strongest aftershocks). These records contribute to fill important gaps in the magnitude-distance-style of faulting distributions of global and regional data sets used to derive ground motion prediction equations. The near-fault ground motions (RJB=0) are generally underestimated by GMPEs, while at larger distances the opposite trend is observed, especially for high- frequency ground motion parameters (i.e., PGA). The residuals calculated for the whole sequence respect to different GMPEs show a negative bias indicating that the recorded ground motions are on average smaller than the ones predicted the empirical models. Preliminary analysis of near-fault records from the mainshock shows that peak motion varies significantly for stations within 5 km from the epicenter. The PGA ranges from 327 cm/s2 to more than 1 g (AQM saturated station). A specific baseline correction procedure was applied to these records in order to recover permanent displacements, that were found to be consistent with results based on GPS measurements. A comparison of the observed acceleration response spectra with recently proposed design spectra for the town of L’Aquila shows that the near-fault motion generally exceeded the no-collapse limit state design spectra both for horizontal and vertical components. Instrumental investigations after the 6 April 2009 L’Aquila earthquake Ameri G. 1, Augliera P. 1, D’Alema E. 1, Franceschina G. 1, Galadini F. 1, Ladina C. 2, Lovati S. 1, Luzi L. 1, Maistrello M. 1, Marzorati S. 1, Massa M. 1, Piccarreda D. 1, Puglia R. 1 1.Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano-Pavia, Via Bassini, 15, 20133 Milano, [email protected] 2.Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Via di Vigna Murata 605, 00143 Roma This work synthesizes the activities conducted in the field by The Milano-Pavia Department of INGV in the three months following the Mw 6.3 event occurred on 6 April 2009 at L’Aquila town (central Italy). The work has been carried out in three phases: 1) deployment of several strong-motion stations in order to record the strongest aftershocks in the near-field, in the days which followed the main event; 2) detection of local site effects in the framework of the C.A.S.E. project, to investigate the seismic response of the areas selected for the construction of the emergency residences for homeless people; 3) geophysical investigations as a contribution to the seismic microzoning for the post-emergency reconstruction in the municipalities with the highest degrees of damage. Phases 2 and 3 had the aim of individuating the soil resonance frequencies through the empirical analysis of the ground motion, such as ambient noise and weak motion, recorded by temporary seismic stations. The stations have been installed in sites with different lithologic and geomorphologic conditions, and a huge data set has been collected to investigate site effects. The instruments have worked from 7 April to 13 July 2009; recording 469 aftershocks in the local magnitude range 2.5 - 5.3. The analysis carried out for phases 2 and 3 was based on the spectral ratio techniques, using a single station (Nakamura technique, and Horizontal to Vertical Spectral Ratio of weak motions) or a reference station (Standard Spectral Ratio). In the three phases the aftershocks have been recorded in 30 sites, corresponding to 25 localities inside the province of L’Aquila; using 11 seismic stations, 9 velocimetric sensors and 8 accelerometers. Finally 70 ambient noise measurements have been executed. The April 6th 2009 L'Aquila earthquake: the peculiar view of the Gran Sasso geodetic interferometers. Amoruso A.1, Crescentini L.2 1.Dipartimento di Fisica, Università di Salerno, Via Ponte Don Melillo, Fisciano (SA), [email protected] 2.Dipartimento di Fisica, Università di Salerno, Via Ponte Don Melillo, Fisciano (SA), [email protected] email Two laser interferometers for geophysical purposes is operating at 1400 m depth beneath the Gran Sasso massif since a few years.
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