Italian strong motion records in ITACA: overview and record processing

Abstract

The published version 1.0 of the new Italian strong-motion database ITACA (Italian ACcelerometric Archive,http://itaca.mi.ingv.it) 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

Estimation of topographical effects at Narni ridge (Central Italy): comparisons between experimental results and numerical modelling

“…As a matter of fact, topographic irregularities are a common feature of many sites of installation of strong motion stations included in the ITACA database (Pacor 2011), thus deserving a specific care for their seismic characterization. Preliminary analyses on the experimental data are described in Massa et al (2010).…”

Forensic Investigations of Geohazards: The Norcia 2016 Earthquake

“…In case of an earthquake of magnitude 6.5, the fault has an area of several hundred square kilometers and, therefore, the entire area above and around the fault is affected by strong shaking. The earthquake of 30 October was the strongest event of a sequence which began with an earthquake on 24 August of 6.0 MW and another earthquake of 26 October of the magnitude MW = 5.9 [21][22][23][24][25][26][27].…”

“…In Figure 2, thanks to both the Italian strong-motion database, ITACA (Italian Accelerometric Archive (http://itaca.mi.ingv.it)) and the USGS database (http://earthquake.usgs.gov), it is possible to calculate the peak ground acceleration (PGA) at the epicenter and at the two study areas (Amelia and Rome). These were 536.48, 18.28, and 24.29 cm/s 2 , respectively [23][24][25]. …”

Engineering Characterization of Earthquake Ground Motions

“…Another way of ensuring compatibility is to post-process the pad-stripped acceleration time series. Boore et al (2012) examined the post-processing adopted for two databases, ITACA (Italian Accelerometric Archive, Paolucci et al 2011;Pacor et al 2011) and PEER NGA (Pacific Earthquake Engineering Research Center-Next Generation Attenuation), and demonstrated that any biases and distortions are small for the vast majority of the records of the two databases, so data can be used with confidence.…”