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Ground motion directionality in the 2010-2011 Canterbury earthquakes

机译：2010-2011年坎特伯雷地震的地震动指向性

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摘要

This paper examines the observed directionality of ground motions in the Christchurch urban area during the 2010-2011 Canterbury, New Zealand earthquakes. A dataset of ground motions recorded at 20 strong motion stations over 10 different earthquake events is utilized to examine the ratios of various response spectral directionality definitions and the orientation of the maximum direction. Because the majority of previous related studies have utilized overlapping ground motion datasets from the NGA database, the results of this study provide a largely independent assessment of these ground motion aspects. It is found that the directionality ratio between the maximum (100th percentile) and 50th percentile orientation-independent spectral acceleration is similar to that obtained from recent studies. Ground motions from the 4 September 2010 Darfield earthquake are shown to exhibit strong directionality for source-to-site distances up to R_(rup) = 30 km, notably further than results from a previous study, which suggests that such effects are generally limited to R_(rup) ＜ 5 km. The adopted dataset also offers the unique potential to consider site-specific effects on directionality ratios and maximum direction orientations; however, in both cases, site-specific effects are found not to be significant in the observed empirical results.
机译：本文研究了在2010-2011年新西兰坎特伯雷地震中，基督城市区观测到的地震动的方向性。利用在10个不同地震事件中的20个强运动台站记录的地面运动数据集，来检查各种响应谱方向性定义的比率和最大方向的方向。由于以前的大多数相关研究都利用了NGA数据库中重叠的地面运动数据集，因此本研究的结果在很大程度上对这些地面运动方面进行了独立评估。发现最大（第100个百分位）与第50个百分位的方向无关的光谱加速度之间的方向比与最近的研究相似。在达不到R_（rup）= 30 km的震源到现场距离的情况下，2010年9月4日达菲尔德地震的地震动显示出较强的方向性，这比以前的研究结果还明显，这表明这种影响通常仅限于R_（rup）＜5公里。所采用的数据集还具有独特的潜力，可以考虑特定地点对方向比和最大方向取向的影响；但是，在这两种情况下，在观察到的经验结果中发现特定地点的影响都不显着。

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