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Earthquake ground motion modeling of induced seismicity in the Groningen gas field

机译：格罗宁根气田诱导地震性地震地面运动模型

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摘要

A physics-based numerical approach is used to characterize earthquake ground motion due to induced seismicity in the Groningen gas field and to improve empirical ground motion models for seismic hazard and risk assessment. To this end, a large-scale (20 km x 20 km) heterogeneous 3D seismic wave propagation model for the Groningen area is constructed, based on the significant bulk of available geological, geophysical, geotechnical, and seismological data. Results of physics-based numerical simulations are validated against the ground motion recordings of the January 8, 2018, M-L 3.4 Zeerijp earthquake. Taking advantage of suitable models of slip time functions at the seismic source and of the detailed geophysical model, the numerical simulations are found to reproduce accurately the observed features of ground motions at epicentral distances less than 10 km, in a broad frequency range, up to about 8 Hz. A sensitivity analysis is also addressed to discuss the impact of 3D underground geological features, the stochastic variability of seismic velocities and the frequency dependence of the quality factor. Amongst others, results point out some key features related to 3D seismic wave propagation, such as the magnitude and distance dependence of site amplification functions, that may be relevant to the improvement of the empirical models for earthquake ground motion prediction.
机译：基于物理的数值方法用于表征由于格罗宁根气田的诱导地震性引起的地震地面运动，并改善地震危害和风险评估的经验地面运动模型。为此，基于可用地质，地球物理，岩土地震数据的大量大部分，构建了Groningen地区的大规模（20公里×20 km）的Groningen区域的异构3D地震波传播模型。基于物理的数值模拟结果验证了2018年1月8日的地面运动录制，M-L 3.4 Zeerijp地震。利用在地震源和详细地球物理模型的合适型号的滑动时间函数模型，发现数值模拟以准确地再现思想距离距离频率范围内的震中距离的地面运动特征，达到频率范围大约8赫兹。还解决了敏感性分析，以讨论3D地下地质特征的影响，地震速度的随机变化以及品质因数的频率依赖性。在其他方面，结果指出了与3D地震波传播相关的一些关键特征，例如站点放大功能的幅度和距离依赖性，这可能与改进地震地面运动预测的经验模型的改进相关。

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