Construction and validation of a simulated ground motion dataset for Turkey

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2023-11-29 DOI:10.1007/s10950-023-10179-z
Abdullah Altindal, Aysegul Askan
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Abstract

A dataset of simulated ground motions is created for seven recorded and previously validated, along with three hypothetical earthquakes in Turkey. This dataset has potential uses in engineering practice and research by both seismological and engineering communities. The simulated ground motion dataset with extensive information on the simulations and ground motion intensity parameters for each simulated motion is presented in an open-access online repository. A two-level randomization scheme is proposed to account for the uncertainties in input parameters and source-to-site geometries. An investigation of the magnitude-distance ranges in the simulated dataset, as well as the distribution of ground motion intensity measures, showed that the created dataset fills the gaps observed in recorded ground motion datasets. Pulse-like motions in the dataset are identified, and the relationship between pulse periods and earthquake magnitude is shown to agree with other relationships in the literature which are derived from recorded ground motions. The effects of source-to-site geometry and uncertainties in the following four input parameters are investigated: magnitude (\(Mw)\), stress drop, (\(\Delta \tau\)), time-averaged shear-wave velocity in the upper 30 m (\({V}_{S30}\)), and high-frequency attenuation parameter (\({\kappa }_{0}\)). The dataset is validated by investigating the variability and inter-period correlation of normalized residual spectral acceleration values (\(\epsilon )\), calculated using a ground motion model (GMM). The variability of \(\epsilon\) is found to be consistent with the variability of GMMs. However, inter-period correlations of \(\epsilon\) are shown to be larger than predictions of empirical models based on recorded earthquakes.

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土耳其模拟地面运动数据集的构建和验证
他们创建了一个模拟地面运动的数据集,其中包括7次记录和先前验证的地震,以及土耳其的3次假设地震。该数据集在地震学和工程界的工程实践和研究中具有潜在的用途。模拟的地面运动数据集具有广泛的模拟信息和每个模拟运动的地面运动强度参数,在一个开放访问的在线存储库中呈现。提出了一种两级随机化方案,以考虑输入参数和源点几何形状的不确定性。对模拟数据集中震级-距离范围以及地面运动强度测量分布的调查表明,创建的数据集填补了在记录的地面运动数据集中观察到的空白。识别了数据集中的脉冲运动,脉冲周期与地震震级之间的关系与文献中从记录的地面运动中得出的其他关系一致。研究了震级(\(Mw)\))、应力降(\(\Delta \tau\))、上30 m时均横波速度(\({V}_{S30}\))和高频衰减参数(\({\kappa }_{0}\))等4个输入参数对震源到震点几何形状和不确定性的影响。通过研究归一化残余频谱加速度值(\(\epsilon )\))的变异性和周期间相关性,验证了数据集的有效性,该值使用地面运动模型(GMM)计算。发现\(\epsilon\)的变异性与GMMs的变异性是一致的。然而,\(\epsilon\)的周期间相关性比基于记录地震的经验模型的预测更大。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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