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首页> 外文期刊>Bulletin of earthquake engineering >On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence
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On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence

机译：关于莫霍反射影响意大利东北部地面运动的能力：以2012艾米利亚地震序列为例

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It has been observed that post-critically reflected S-waves and multiples from the Moho discontinuity could play a relevant role on the ground motion due to medium to strong size earthquakes away from the source. Although some studies investigated the correlation between the Moho reflections amplitudes and the damage in the far field, little attention was given to the frequency content of these specific phases and their scaling with magnitude. The 2012 Emilia seismic sequence in northern Italy, recorded by velocimetric and accelerometric networks, is here exploited to investigate Moho reflections and multiples (SmSM). A single station method for group velocity-period estimation, based on the multiple filter technique, is applied to strong motion data to detect SmSM. Amplitude and frequency scaling with magnitude is defined for earthquakes from Mw = 3.9 to Mw = 5.9. Finally, the ability of SmSM to affect the ground motion for a maximum credible earthquake within the Po plain is investigated by extrapolating observed engineering parameters. Data analysis shows that high amplitude SmSM can be recognized within the Po plain, and at the boundaries between the Po plain and the Alpine chain, at epicentral distances larger than 80 km, in the period range from 0.25 to 3 s and in the group velocity window from about 2.6 to 3.2 km/s. 5% damped pseudo-spectral accelerations at different periods (0.3, 1.0 and 2.0 s), and Housner intensities, are obtained from data characterized by large amplitude SmSM. A scaling relationship for both pseudo-spectral accelerations and Housner intensities is found for the earthquakes of the 2012 Emilia seismic sequence. IMCS from VII to VIII is estimated, as a result of SmSM amplitude enhancement, at about 100km for a maximum credible earthquake (Mw = 6.7) in the Po plain, showing that moderate to high damage cloud be caused by these specific phases.
机译：已经观察到，由于远离震源的中等至强大地震，后临界反射的S波和来自Moho不连续面的倍数可能对地面运动起着重要作用。尽管一些研究调查了Moho反射振幅与远场损伤之间的相关性，但很少关注这些特定相位的频率含量及其随幅度的缩放。通过测速和加速度网络记录的意大利北部2012年艾米利亚地震序列，在这里用于研究莫霍面反射和多次波（SmSM）。基于多重滤波技术的单站群速度周期估计方法被应用于强运动数据以检测SmSM。针对从Mw = 3.9到Mw = 5.9的地震定义了幅度和频率随大小变化的标度。最后，通过外推观测到的工程参数，研究了SmSM影响大平原上最大可信地震的地震动的能力。数据分析表明，在波平原内以及波平原与高山链之间的边界处，距震中距离大于80 km，周期范围为0.25至3 s以及群速度都可以识别出高振幅SmSM。窗口从约2.6到3.2 km / s。从以大振幅SmSM为特征的数据中获得了在不同周期（0.3、1.0和2.0 s）和Housner强度的5％阻尼伪谱加速度。对于2012年艾米利亚地震序列的地震，发现了伪谱加速度和霍斯纳强度的比例关系。由于SmSM振幅增强，估计VII至VIII的IMCS在Po平原最大可信地震（Mw = 6.7）约100 km处，表明这些特定阶段造成了中度至高度的破坏云。

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