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Italian strong motion records in ITACA: overview and record processing

机译：ITACA中的意大利强劲运动记录：概述和记录处理

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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/s~2 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.
机译：新的意大利强运动数据库ITACA（Italian ACcelerometric Archive，http://itaca.mi.ingv.it）的已发布版本1.0迄今为止（2010年12月）包括大约4,000种三分量波形，直到M 6.9为止。在1972年至2009年期间，大约有400个台站记录了1800次至6.9级的地震。未校正和校正后的强运动数据将被存档，并可以使用它们的元数据来检索，这些元数据涉及事件，测站和波形。本文的目的是介绍处理ITACA中包含的记录的程序，从记录的质量和幅度上考虑该数据集的异质性，并说明ITACA强运动数据集的主要特征。之后，我们将重点放在“异常”地面运动记录上，这些记录通常按照惯例表示为峰值加速度和峰值速度分别大于300 cm / s〜2和15 cm / s的记录。这些记录不到整个ITACA数据集的2％，但它们与地震危险性和工程意义最相关。如此大的峰值记录在30 km的距离上，不仅与意大利最强烈的地震有关，而且与4级以下的地震有关。此外，我们研究了最大峰值在水平和垂直方向上的依赖性。源到站点的距离。

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