ITACAext flatfile: parametric table of metadata and strong motion intensity measures

The ITACAext flat-file is a parametric table containing metadata and intensity measures of manually processed waveforms, relevant for the analysis of the ground-motion in Italy.
The flat-file is constituted by the data included in ITACA3.2 up to 2020 December 31st. Moreover, it is integrated with velocimetry records of about 120 events of small magnitude in the less sampled areas in Italy (e.g., Liguria, Piedmont, and western Sicily), taking care to exclude recordings affected by instrument saturation. If the earthquakes are recorded at the Italian boundaries, the records of the networks of the neighbouring countries, such as France, Switzerland, Slovenia, Albania, and Montenegro, are also added in order to improve the spatial and azimuthal sampling of the events. All the waveforms of this extended dataset (called ITACAext) were manually processed according to the standard ITACA scheme, described in Paolucci et al. (2011) and Puglia et al. (2018). The flat-file of the ITACAext records is formatted consistently with the Engineering Strong Motion database flat-file (Lanzano et al. 2019). The flat-file includes 46,691 records of 2,019 events, recorded by 2,112 stations. ITACAext will be the primary source of information to study the local differences of ground-motion in Italy and develop the new-generation regionalized ground-motion models for events in active crustal regions, volcanic and subduction zones. The event selection criteria are: i) time interval 1972-2020; ii) revised events (events with preliminary locations are excluded); iii) latitude range [35°-48°] and longitude range [6°-19°]; iv) magnitude (moment Mw, local ML or surface waves Ms) higher or equal to 3.0.

ITACAext扁平文件数据集（flat-file）是一款参数化表格数据集，包含经人工处理的地震波形数据的元数据与地面运动强度度量参数，适用于意大利地区的地震动分析研究。
该扁平文件数据集的基础数据来源于截至2020年12月31日的ITACA3.2数据集。此外，为补充意大利采样稀疏区域（如利古里亚、皮埃蒙特与西西里西部）的观测记录，本数据集整合了约120次小震级事件的速度波形记录，并严格剔除受仪器饱和效应影响的观测记录。若地震事件的观测记录位于意大利边境区域，还将补充法国、瑞士、斯洛文尼亚、阿尔巴尼亚及黑山等邻国台网的观测记录，以提升该类事件的空间与方位角采样覆盖率。
本扩展数据集（命名为ITACAext）的全部波形数据均按照标准ITACA数据处理流程开展人工校正与处理，该流程详见Paolucci等人（2011）与Puglia等人（2018）的研究成果。ITACAext记录的扁平文件数据集格式与工程强震动数据库扁平文件格式（Lanzano等人，2019）保持一致。该数据集共包含2112个台站记录的2019次地震事件的46691条波形记录。
ITACAext将作为核心数据源，用于研究意大利地区地震动的区域差异，并为活动地壳区域、火山及俯冲带内的地震事件研发新一代区域化地震动预测模型。本数据集的事件筛选标准如下：① 时间范围为1972年至2020年；② 仅纳入经修正定位的地震事件（排除仅具备初步定位结果的事件）；③ 纬度范围为35°至48°，经度范围为6°至19°；④ 震级（包括矩震级M_W、地方震级M_L和面波震级M_S）不低于3.0。