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Ground-Motion Simulation in the Lower Tagus Valley Basin

机译：塔霍河下游盆地的地震动模拟

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Throughout history, the Lower Tagus Valley (LTV) region has been shaken by several earthquakes, including some with moderate to large magnitudes and with sources located inside the basin, for example the 1344 (M6.0) and 1909 (M6.0) earthquakes. Previous simulations (BEZZEGHOUD et al. Natural Hazard 69: 1229-1245, 2011) have revealed strong amplification of the amplitude waves in the region, because of the effect of the low-velocity sediments that fill the basin. The model used in those simulations was updated in this work by including new high-resolution geophysical and geotechnical data available for the area (seismic reflection, aeromagnetic, gravimetric, deep wells, standard penetration tests, and geological data). To contribute to improved assessment of seismic hazard in the LTV, we simulated propagation of seismic waves produced by moderate earthquakes in a 3D heterogeneous medium by using elastic finite-difference wave propagation code. The method, successfully used by GRANDIN et al. (Geophys J Int 171: 1144-1161, 2007), involves evaluation of the seismic potential of known faults in the area studied and three-dimensional seismic ground motion modelling by use of finite difference methods. On the basis of this methodology, we calculated the ground motion for the April 23, 1909, Benavente (Portugal) earthquake (Mw = 6.0) in dense grid points, then computed the synthetic isoseismic map of the area by use of appropriate relationships between seismic intensity (MMI) and peak ground velocity (PGV). The synthetic results, in contrast with available macroseismic and instrumental data, enable validation of the source models proposed for the area, identification of the sources of historical earthquakes, and could also indicate which areas are more exposed to seismic ground motion.
机译：纵观整个历史，下塔霍斯河谷（LTV）地区一直被几次地震震撼，包括一些中等到大震级，震源位于盆地内部，例如1344（M6.0）和1909（M6.0）地震。先前的模拟（BEZZEGHOUD等人，Natural Hazard 69：1229-1245，2011）已经显示出该区域振幅波的强烈放大，这是由于充满盆地的低速沉积物的影响。这些工作中使用的模型已在此工作中进行了更新，其中包括该地区可用的新的高分辨率地球物理和岩土数据（地震反射，航空磁，重力，深井，标准穿透试验和地质数据）。为了有助于改进LTV中的地震危险性评估，我们使用弹性有限差分波传播代码模拟了3D非均质介质中中等地震产生的地震波的传播。该方法已由GRANDIN等成功地使用。 （Geophys J Int 171：1144-1161，2007），涉及评估研究区域内已知断层的地震潜力，并使用有限差分方法对三维地震地震动进行建模。在此方法的基础上，我们计算了1909年4月23日贝纳万特（葡萄牙）地震（Mw = 6.0）在密集网格点的地震动，然后利用地震之间的适当关系计算了该地区的综合等震图强度（MMI）和峰值地面速度（PGV）。与现有的宏观地震和仪器数据相比，综合结果能够验证为该地区提出的震源模型，识别历史地震的震源，并且还可以指示哪些地区更容易遭受地震地震动。

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