Validation of Peak Ground Velocities Recorded on Very-high rate GNSS Against NGA-West2 Ground Motion Models
Validation of Peak Ground Velocities Recorded on Very-high rate GNSS Against NGA-West2 Ground Motion Models
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DOI：
10.26443/seismica.v2i1.239
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
B. Crowell;Jensen DeGrande;T. Dittmann;J. Ghent
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作者：
B. Crowell;Jensen DeGrande;T. Dittmann;J. Ghent
大地震期间的强地面运动观测通常是用强运动加速度计进行的。这些观测在早期预警系统、地震工程、震源物理学研究、盆地和场地放大以及宏观地震强度估计方面发挥着关键作用。在这篇手稿中，我们提出了一个新的观测强地面运动的非常高的速率（>= 5赫兹）全球导航卫星系统（GNSS）派生的速度。我们证明，GNSS仪器上记录的速度观测结果与现有的地面运动模型和宏观地震强度观测结果是一致的。我们发现，使用现有的NGA-West 2模型的地面运动预测匹配我们观察到的峰值地面速度的中位数对数总残差为0.03-0.33和标准差为0.72-0.79，并在统计上显着的正态性检验。最后，我们通过从GNSS导出峰值地面速度的地面运动模型来完成，并发现总剩余标准偏差为0.58，当考虑对Vs 30进行简单校正时，可以将其提高约2%。
Observations of strong ground motion during large earthquakes are generally made with strong-motion accelerometers. These observations have a critical role in early warning systems, seismic engineering, source physics studies, basin and site amplification, and macroseismic intensity estimation. In this manuscript, we present a new observation of strong ground motion made with very high rate (>= 5 Hz) Global Navigation Satellite System (GNSS) derived velocities. We demonstrate that velocity observations recorded on GNSS instruments are consistent with existing ground motion models and macroseismic intensity observations. We find that the ground motion predictions using existing NGA-West2 models match our observed peak ground velocities with a median log total residual of 0.03-0.33 and standard deviation of 0.72-0.79, and are statistically significant following normality testing. We finish by deriving a Ground Motion Model for peak ground velocity from GNSS and find a total residual standard deviation 0.58, which can be improved by ~2% when considering a simple correction for Vs30.