Basin-related effects on ground motion for earthquake scenarios in the Lower Rhine Embayment
Basin-related effects on ground motion for earthquake scenarios in the Lower Rhine Embayment
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DOI：
10.1111/j.1365-246x.2006.02909.x
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发表时间：
2006-07-01
影响因子：
2.8
通讯作者：
Scherbaum, Frank
中科院分区：
文献类型：
--
作者：
Ewald, Michael;Igel, Heiner;Scherbaum, Frank
使用完整波形模型对地震场景进行确定性计算在估计地震活跃地区的震动危险方面发挥着越来越重要的作用。在这里，我们将地震波传播的 3D 数值模型应用于莱茵河下游海湾地区的 6+ 级地震场景，该地区是中欧地震最活跃的地区之一。我们使用从地质学、钻孔信息和地震实验中得出的 3D 盆地模型，旨在证明地面震动对震源位置和盆地结构的强烈依赖性。模拟的频率高达大约。 1赫兹。正如预期的那样，盆地结构导致峰值地震动、放大率和震动持续时间出现强烈的横向变化。根据源-盆地-接收区的几何形状，影响与盆地深度和盆地侧面的坡度相关；然而，盆地也会影响盆地外部的峰值地面运动和估计的震动危险。与其中一场地震的实测地震图进行比较表明，再现了波动的一些主要特征。累积从三个模拟地震情景中得出的地震强度，得出我们研究区域的主要是盆地相关的强度分布。
The deterministic calculation of earthquake scenarios using complete waveform modelling plays an increasingly important role in estimating shaking hazard in seismically active regions. Here we apply 3-D numerical modelling of seismic wave propagation to M 6+ earthquake scenarios in the area of the Lower Rhine Embayment, one of the seismically most active regions in central Europe. Using a 3-D basin model derived from geology, borehole information and seismic experiments, we aim at demonstrating the strong dependence of ground shaking on hypocentre location and basin structure. The simulations are carried out up to frequencies of ca. 1 Hz. As expected, the basin structure leads to strong lateral variations in peak ground motion, amplification and shaking duration. Depending on source-basin-receiver geometry, the effects correlate with basin depth and the slope of the basin flanks; yet, the basin also affects peak ground motion and estimated shaking hazard thereof outside the basin. Comparison with measured seismograms for one of the earthquakes shows that some of the main characteristics of the wave motion are reproduced. Cumulating the derived seismic intensities from the three modelled earthquake scenarios leads to a predominantly basin correlated intensity distribution for our study area.