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Correlation properties of integral ground-motion intensity measures from Italian strong-motion records

机译：意大利强运动记录积分地面运动强度措施的相关性能

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摘要

This study investigates the correlation properties of integral ground-motion intensity measures (IMs) from Italian strong-motion records. The considered integral IMs include 5-95% significant duration, Housner intensity, cumulative absolute velocity, and Arias intensity. Both IM spatial correlation and the correlation between different integral and amplitude-based IMs (i.e., cross-IM correlation) are addressed in this study. To this aim, a new Italian ground-motion model (GMM) with spatial correlation for integral IMs is first introduced. Based on the newly developed GMM, the empirical correlation coefficients from interevent and intraevent residuals are investigated and various analytical correlation models between integral IMs and amplitude-based IMs are proposed. The effective range parameter representing spatial correlation properties and the trend in the cross-IM correlations are compared with existing models in the literature. The variability of the effective range parameters with respect to event-specific features is also discussed. Modeling ground-motion spatial and cross-IM correlations is an important step in seismic hazard and risk assessment of spatially distributed systems. Investigating region-specific correlation properties based on Italian strong-motion records is of special interest as several correlation models have been developed based on global datasets, often lacking earthquakes in extensional regions such as Italy.
机译：本研究研究了来自意大利强运动记录的整体地面运动强度措施（IMS）的相关性。所考虑的积分IMS包括5-95％的持续时间，孔隙强度，累积绝对速度和arias强度。在本研究中解决了IM空间相关性和基于不同积分和幅度的IMS（即交叉电讯相关）之间的相关性。为此目的，首先介绍了一种新的意大利地面运动模型（GMM），具有整体IMS的空间相关性。基于新开发的GMM，研究了来自默认和局部残留物的经验相关系数，提出了整体IMS和基于幅度的IMS之间的各种分析相关模型。将表示空间相关性能的有效范围参数和交叉电极相关的趋势与文献中的现有模型进行了比较。还讨论了关于事件特定特征的有效范围参数的可变性。建模地运动空间和交叉电视相关是空间分布系统地震危害和风险评估的重要步骤。研究基于意大利强运动记录的区域特异性相关性具有特殊兴趣，因为基于全球数据集的若干相关模型，通常缺乏意大利的扩展区域中的地震。

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