Italian strong motion records in ITACA: overview and record processing |
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| Authors: | Francesca Pacor Roberto Paolucci Gabriele Ameri Marco Massa Rodolfo Puglia |
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| Institution: | 1. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano-Pavia, Via Bassini 15, 20133, Milano, Italy
2. Department of Structural Engineering, Politecnico di Milano, Milano, Italy
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| Abstract: | The published version 1.0 of the new Italian strong-motion database ITACA (Italian ACcelerometric Archive, ) includes to date (December 2010) about 4,000 three-component waveforms up to M 6.9, from more than 1,800 earthquakes up
to 6.9, recorded by about 400 stations in the period 1972–2009. The uncorrected and corrected strong motion data are archived
and can be retrieved with their metadata, concerning events, stations and waveforms. The aim of this paper is to present the
procedures for processing the records included in ITACA, accounting for the heterogeneity of this data set, both in terms
of quality and amplitude of records as well as illustrating the main features of the ITACA strong-motion dataset. Later, we
focus on the “exceptional” ground-motion records, that we, conventionally, denote as those having peak acceleration and peak
velocity larger than 300 cm/s2 and 15 cm/s, respectively. These records are less than 2% of the whole ITACA dataset but they are the most relevant for the
seismic hazard and engineering implications. Such large peak values, recorded at distances up to 30 km, are related not only
to the strongest Italian earthquakes, but also to events with magnitude down to 4. Furthermore, we investigate the dependence
of the largest peak values on horizontal and vertical directions and on source-to-site distance. |
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