Ground motion prediction is an important element in seismic hazard analysis. However, the availability of recorded strong ground motion data is limited, particularly for large events in near-source regions. Recently, several physics-based ground motion simulation approaches have been developed, which may be useful for understanding the effect of earthquake source on near-source ground motion characteristics. In this study, we investigated the sensitivity of near-source ground motions to finite earthquake source processes with pseudo-dynamic source models, based on 1-point and 2-point statistics of earthquake source parameters. We simulated ground motions for M_w 6.6 and 7.0 vertical strike-slip events using pseudo-dynamic source models derived from multiple sets of input source statistics and investigated the characteristics of near-source ground motions relative to the input source statistics, focusing on the relative station locations with respect to finite-fault geometry. Our results show that the effect of earthquake source on near-source ground motions can vary depending on the locations of near-source stations. The variability of ground motion intensities derived from multiple sets of input source statistics was greater in the forward directivity region. This pattern is also consistent for pseudo-spectral accelerations with various periods. The pseudo-dynamic source modeling method with 1-point and 2-point statistics seems to be an efficient framework for understanding the effect of earthquake source on near-source ground motion characteristics.

中文翻译：

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利用震源参数的1点和2点统计推导出的近源地震动对拟动力源模型的敏感性分析

地震动预测是地震危险性分析中的重要元素。但是，记录的强地面运动数据的可用性受到限制，特别是对于近源地区的大型事件。近来，已经开发了几种基于物理学的地震动模拟方法，这可能有助于理解地震源对近源地震动特征的影响。在这项研究中，我们基于伪震源模型，基于震源参数的1点和2点统计，研究了近震源地震动对有限震源过程的敏感性。我们模拟了M _w的地面运动6.6和7.0垂直走滑事件，使用来自多组输入源统计数据的伪动态源模型，研究了相对于输入源统计数据的近源地震动的特征，重点是相对于有限站的相对站位置断层几何。我们的结果表明，震源对近震源地震动的影响会因近震源站的位置而异。从多组输入源统计数据得出的地震动强度的变化在正向方向性区域更大。对于具有不同周期的伪谱加速度，该模式也是一致的。