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首页> 外文期刊>Bulletin of earthquake engineering >Towards fully data driven ground-motion prediction models for Europe
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Towards fully data driven ground-motion prediction models for Europe

机译:建立完全由数据驱动的欧洲地面运动预测模型

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We have used the Artificial Neural Network method (ANN) for the derivation of physically sound, easy-to-handle, predictive ground-motionmodels from a subset of the Reference database for Seismic ground-motion prediction in Europe (RESORCE). Only shallow earthquakes (depth smaller than 25 km) and recordings corresponding to stations with measured V_(s30) properties have been selected. Five input parameters were selected: the moment magnitude MW, the Joyner-Boore distance R_(J B), the focal mechanism, the hypocentral depth, and the site proxy V_(S30). A feed-forward ANN type is used, with one 5-neuron hidden layer, and an output layer grouping all the considered ground motion parameters, i.e., peak ground acceleration (PGA), peak ground velocity (PGV) and 5%-damped pseudo-spectral acceleration (PSA) at 62 periods from 0.01 to 4 s. A procedure similar to the random-effects approach was developed to provide between and within event standard deviations. The total standard deviation (σ) varies between 0.298 and 0.378 (log10 unit) depending on the period, with between-event and within-event variabilities in the range 0.149-0.190 and 0.258-0.327, respectively. Those values prove comparable to those of conventional GMPEs. Despite the absence of any a priori assumption on the functional dependence, our results exhibit a number of physically sound features: magnitude scaling of the distance dependency, near-fault saturation distance increasing with magnitude, amplification on soft soils and even indications for nonlinear effects in softer soils.
机译:我们已经使用人工神经网络方法(ANN)从欧洲地震地震动预测(RESORCE)参考数据库的子集中推导了物理上合理的,易于处理的预测地震动模型。仅选择了浅地震(深度小于25 km)和与具有测得的V_(s30)特性的测站相对应的记录。选择了五个输入参数:力矩大小MW,Joyner-Boore距离R_(J B),震源机制,震中深度和位置代理V_(S30)。使用前馈ANN类型,其中一个5神经元隐藏层,而输出层则将所有考虑的地面运动参数分组,即地面峰值加速度(PGA),峰值地面速度(PGV)和5%阻尼伪模拟在0.01到4 s的62个周期内产生-光谱加速度(PSA)。开发了一种类似于随机效应方法的程序,以提供事件之间和事件内的标准偏差。总标准偏差(σ)随时间段在0.298和0.378(log10单位)之间变化,事件之间和事件内的变化分别在0.149-0.190和0.258-0.327范围内。这些值证明与常规GMPE相当。尽管对功能依赖性没有任何先验假设,但我们的结果仍显示出许多物理上合理的特征:距离依赖性的量级缩放,近故障饱和距离随量级增加,在软土上放大甚至显示非线性效应。较软的土壤。

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