Two regional ground-motion models are available at present for western Saudi Arabia, a region that is characterized by considerable seismic activity due to the spreading in the Red Sea and continental volcanism. The first model was created by Sokolov and Zahran (Arab J Geosci 11:38, 2018) using the stochastic simulation technique (Boore in Pure Appl Geoph 160(3):635–676, 2003) and it was reported in tabular form for moment magnitudes (M) from 5 to 7. The second model was developed by Kiuchi et al. (Bull Seismol Soc Am 109:2722–2737, 2019) as mathematical expression (empirical ground motion prediction equation, GMPE) on the basis of records from regional earthquakes with local magnitudes from M_L 3 to 5.4. In this work, we first construct a GMPE using stochastic simulation data. This stochastic GMPE considers magnitude, distance and stress drop as input parameters. Second, we compare these two independently developed regional ground-motion models and employ a scheme for the modification of the empirical GMPE up to M 7.5 using the stochastic GMPE as the reference model. The revised GMPEs presented here provide regional ground motion models (PGA and spectral amplitudes at natural periods 0.2 s and 1.0 s) that may be used in logic tree scheme for assessment of seismic hazard in western Saudi Arabia.

目前，沙特阿拉伯西部有两种区域地震动模型，该地区的特征是由于红海中的扩散和大陆性火山活动而产生大量地震活动。第一个模型是由Sokolov和Zahran（Arab J Geosci 11:38，2018）使用随机模拟技术（Boore in Pure Appl Geoph 160（3）：635–676，2003）创建的，目前以表格形式报告幅度（M）从5到7。第二个模型是由Kiuchi等人开发的。（Bull Seismol Soc Am 109：2722–2737，2019）作为数学表达式（经验地面运动预测方程，GMPE），基于当地地震的记录，局部震级为M _L3至5.4。在这项工作中，我们首先使用随机模拟数据构建GMPE。这种随机GMPE将幅度，距离和应力降视为输入参数。其次，我们比较了这两个独立开发的区域地面运动模型，并采用随机GMPE作为参考模型，采用了将经验GMPE修改为M 7.5的方案。此处提出的修订版GMPE提供了区域地面运动模型（自然周期为0.2 s和1.0 s的PGA和频谱幅度），可用于逻辑树计划中以评估沙特阿拉伯西部的地震灾害。