Seismic hazard and risk analyses are increasingly tapping into the previously underused resource of local weak-motion records. This is facilitating the development of local- or even application-specific models for the characterisation of earthquake ground motion. In turn, this offers the opportunity to derive non- or partially non-ergodic models and significantly reduce bias and uncertainty. However, weak-motion data, while carrying important information about local earthquake source, path and site effects, are susceptible to noise. We show that high-frequency noise has a record-, or region-specific, impact on pseudo-spectral acceleration (PSA). This impact depends on the shape of the records’ Fourier amplitude spectrum (FAS): PSA from moderately to highly damped ‘soil’ records (e.g. Groningen, the Netherlands) is much less susceptible to high-frequency noise than PSA from weakly damped ‘rock’ records (e.g. Eastern North America). We make use of simulated ground motion records to develop a parametric model for the lower usable period of PSA (T_min). The model accounts for the impact of high-frequency noise on PSA, conditional on easily measured parameters characterising the shape of a record’s FAS. We then present a workflow, describing processing undertaken for records of induced seismicity from the Groningen gas field. The workflow includes the definition of maximum and minimum usable frequencies and periods of FAS and PSA, respectively. As part of the workflow, we present an approach that considers multiple estimates of T_min. These include the parametric model and, additionally, record-specific hybrid simulations that artificially extend or modify time series’ FAS beyond the noise floor to assess subsequent impacts on PSA.

地震危险性和风险分析越来越多地利用了以前未被充分利用的本地弱运动记录资源。这促进了局部或什至特定应用模型的发展，以表征地震地震动。反过来，这提供了导出非或部分非遍历模型的机会，并显着减少了偏差和不确定性。但是，微弱的运动数据在承载有关本地地震震源，路径和场地影响的重要信息的同时，也容易受到噪声的影响。我们表明，高频噪声对伪谱加速度（PSA）具有记录或特定区域的影响。这种影响取决于记录的傅立叶振幅谱（FAS）的形状：PSA从中等到高度阻尼的“土壤”记录（例如Groningen，（例如，荷兰）比受弱阻尼的“岩石”唱片（例如，北美东部）的PSA干扰的高频噪声要少得多。我们利用模拟的地面运动记录来为PSA的较低可用周期开发参数模型（T _min）。该模型考虑了高频噪声对PSA的影响，条件是易于测量的，表征记录FAS形状的参数。然后，我们提出一个工作流程，描述为记录格罗宁根气田引起的地震活动而进行的处理。工作流分别包括FAS和PSA的最大和最小可用频率和周期的定义。作为工作流的一部分，我们提出一种考虑T _min的多个估计的方法。其中包括参数模型以及特定于记录的混合仿真，这些仿真可以人为地将时间序列的FAS扩展或修改到超出本底噪声的水平，以评估对PSA的后续影响。