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首页> 外文期刊>Bulletin of earthquake engineering >Shakemaps uncertainties and their effects in the post-seismic actions for the 2012 Emilia (Italy) earthquakes
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Shakemaps uncertainties and their effects in the post-seismic actions for the 2012 Emilia (Italy) earthquakes

机译：Shakemaps的不确定性及其在2012年艾米利亚（意大利）地震后震中的作用

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摘要

The May 20, 2012, Emilia Ml 5.9 earthquake was followed by some major aftershocks, well recorded by a large number of temporary stations that were installed to monitor the sequence. These additional recordings allowed us a thorough testing of the performance of the ShakeMap-a procedure designed to provide rapid information on the experienced ground motion. We found that the shakemaps for the May 29, 2012, Ml 5.8 earthquake, obtained using the permanent stations only, underestimate significantly the ground motion computed with the highest station density, especially for PSA at long periods (T=3.0 s). This low-frequency motion is controlled primarily by the surface waves recorded in the Po plain: the observed site effects are likely not accounted properly by the site correction coefficient based on Vs30 as implemented in the ShakeMap procedure. The shakemaps determined during the seismic sequence have been included in an Italian national law that was passed after the 2012 earthquake. According to this law, the factories safety verifications were bound to the comparison between the shakemaps and the design acceleration required by the current national seismic code.We then decide to appraise the impact of the shakemap accuracy on the law provisions. Following the law recommendations, we have estimated the possible errors resulting from the incomplete evaluation of the ground shaking: our results show that, if the complete dataset were available at the time of the law approval, the number of buildings for which the safety check was required would have been significantly smaller.
机译：2012年5月20日的艾米利亚大米5.9级地震之后发生了一些严重的余震，大量的临时地震台站记录了这些地震台站，以监测地震序列。这些额外的记录使我们能够对ShakeMap的性能进行全面测试，该程序旨在提供有关经历的地面运动的快速信息。我们发现，仅使用永久性测站获得的2012年5月29日5.8级地震的震荡图就大大低估了以最高测站密度计算出的地面运动，尤其是对于长时间PSA（T = 3.0 s）而言。这种低频运动主要受Po平原中记录的表面波控制：观察到的位点效应可能无法通过ShakeMap程序中基于Vs30的位点校正系数正确解释。在地震序列中确定的震动图已包含在2012年地震后通过的意大利国家法律中。根据该法律，工厂安全性验证仅限于将振动图与现行国家地震法规要求的设计加速度进行比较，然后决定评估振动图精度对法律规定的影响。根据法律建议，我们估计了由于不完全评估地震动而可能导致的错误：我们的结果表明，如果在法律批准时可以获得完整的数据集，则进行安全检查的建筑物数量所需的将大大减少。

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