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Empirical attenuation relationship for Arias Intensity

机译：咏叹调强度的经验衰减关系

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摘要

Arias Intensity is a ground motion parameter that captures the potential destructiveness of an earthquake as the integral of the square of the acceleration-time history. It correlates well with several commonly used demand measures of structural performance, liquefaction, and seismic slope stability. A new empirical relationship is developed to estimate Arias Intensity as a function of magnitude, distance, fault mechanism, and site category based on 1208 recorded ground motion data from 75 earthquakes in active plate-margins. Its functional form is derived from the point-source model, and the coefficients are detennined through non-linear regression analyses using a random-effects model. The results show that for large magnitude earthquakes (M>7) Arias Intensity was significantly overestimated by previous relationships while it was underestimated for smaller magnitude events (M≤6). The average horizontal Arias Intensity is not significantly affected by forward rupture directivity in the near-fault region. The aleatory variability associated with Arias Intensity is larger than that of most other ground motion parameters such as spectral acceleration. However, it may be useful in assessing the potential seismic performance of stiff engineering systems whose response is dominated by the short-period characteristics of ground motions.
机译：咏叹调强度是一种地面运动参数，它捕获地震的潜在破坏力，作为加速度时间历史的平方的整数。它与几种常用的结构性能，液化和地震边坡稳定性的需求量测方法有很好的关联。建立了一种新的经验关系，以根据1208个记录的活动板块边缘地震中的1208个记录的地震动数据，根据面积，距离，断层机制和地点类别来估计Arias强度。它的功能形式是从点源模型导出的，系数是通过使用随机效应模型的非线性回归分析确定的。结果表明，对于大地震（M> 7），以前的关系显着高估了咏叹调强度，而对于小地震（M≤6）则低估了咏叹调强度。近断层区域的前向破裂方向性对平均水平阿里亚斯强度没有显着影响。与咏叹调强度相关的偶然变异性大于大多数其他地面运动参数（如频谱加速度）的变异性。但是，它对于评估刚性工程系统的潜在地震性能可能很有用，这些工​​程的响应主要由地震动的短周期特征决定。

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