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首页> 外文期刊>Bulletin of the Seismological Society of America >Ground motions recorded in Rome during the April 2009 L'Aquila seismic sequence: Site response and comparison with ground- motion predictions based on a global dataset
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Ground motions recorded in Rome during the April 2009 L'Aquila seismic sequence: Site response and comparison with ground- motion predictions based on a global dataset

机译：2009年4月拉奎拉地震序列期间在罗马记录的地震动：站点响应以及与基于全球数据集的地震动预测的比较

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摘要

The mainshock and moderate-magnitude aftershocks of the 6 April 2009 M 6.3 L'Aquila seismic sequence, about 90 km northeast of Rome, provided the first earthquake ground-motion recordings in the urban area of Rome. Before those recordings were obtained, the assessments of the seismic hazard in Rome were based on intensity observations and theoretical considerations. The L'Aquila recordings offer an unprecedented opportunity to calibrate the city response to central Apennine earthquakes-earthquakes that have been responsible for the largest damage to Rome in historical times. Using the data recorded in Rome in April 2009, we show that (1) published theoretical predictions of a 1 s resonance in the Tiber valley are confirmed by observations showing a significant amplitude increase in response spectra at that period, (2) the empirical soil-transfer functions inferred from spectral ratios are satisfactorily fit through 1D models using the available geological, geophysical, and laboratory data, but local variability can be large for individual events, (3) response spectra for the motions recorded in Rome from the L'Aquila earthquakes are significantly amplified in the radial component at periods near 1 s, even at a firm site on volcanic rocks, and (4) short-period response spectra are smaller than expected when compared to ground-motion predictions from equations based on a global dataset, whereas the observed response spectra are higher than expected for periods near 1 s. Online Material: Velocity models used in computing theoretical site response.
机译：2009年4月6日在罗马东北约90公里处的M 6.3拉奎拉M 6.3级地震序列的主震和中度余震提供了罗马市区的第一批地震地面运动记录。在获得这些记录之前，罗马的地震危险性评估是基于强度观测和理论考虑。拉奎拉（L'Aquila）唱片为校准该市对亚平宁中部地震的反应提供了前所未有的机会，这些地震是历史上对罗马造成的最大破坏。使用2009年4月在罗马记录的数据，我们表明（1）已发表的台伯河谷1 s共振的理论预测已得到以下观察的证实：观察到的结果表明，在此期间响应光谱的振幅显着增加;（2）经验土壤-根据频谱比率推断出的传递函数可以通过一维模型使用可用的地质，地球物理和实验室数据来令人满意地拟合，但是局部变化对于单个事件可能很大，（3）拉奎拉在罗马记录的运动的响应谱即使在火山岩的坚硬地点，地震在1 s的时间段内的径向分量中也会显着放大，并且（4）与根据基于全球数据集的方程式进行的地震动预测相比，短时反应谱小于预期，而在1 s左右的时间内观察到的响应谱高于预期。在线材料：用于计算理论站点响应的速度模型。

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