On 24 January 2020 an M_w 6.8 earthquake occurred at 20:55 local time (17:55 UTC) in eastern Turkey, close to the town of Sivrice in the Elazığ province, causing widespread considerable seismic damage in buildings. In this study, we analyse the main features of the rupture process and the seismic ground shaking during the Elazığ earthquake. We first use Interferometric Synthetic Aperture Radar (InSAR) interferograms (Sentinel-1 satellites) to constrain the fault geometry and the coseismic slip distribution of the causative fault segment. Then, we utilize this information to analyse the ground motion characteristics of the main shock in terms of peak ground acceleration (PGA), peak ground velocity (PGV) and spectral accelerations. The absence of seismic registrations in near-field for this earthquake imposes major constraints on the computation of seismic ground motion estimations in the study area. To do this, we have used a stochastic finite-fault simulation method to generate high-frequency ground motions synthetics for the M_w 6.8 Elazığ 2020 earthquake. Finally, we evaluate the potential state of stress of the unruptured portions of the causative fault segment as well as of adjacent segments, using the Coulomb stress failure function variations. Modelling of geodetic data shows that the 2020 Elazığ earthquake ruptured two major slip patches (for a total length of about 40 km) located along the Pütürge segment of the well-known left-lateral strike-slip East Anatolian Fault Zone (EAFZ), with up to 2.3 m of slip and an estimated geodetic moment of 1.70 |$\,\, \times $| 10¹⁹ Nm (equivalent to a M_w 6.8). The position of the hypocentre supports the evidence of marked WSW rupture directivity during the main shock. In terms of ground motion characteristics, we observe that the high-frequency stochastic ground motion simulations have a good capability to reproduce the source complexity and capture the ground motion attenuation decay as a function of distance, up to the 200 km. We also demonstrate that the design spectra corresponding to 475 yr return period, provided by the new Turkish building code is not exceeded by the simulated seismograms in the epicentral area where there are no strong motion stations and no recordings available. Finally, based on the Coulomb stress distribution computation, we find that the Elazığ main shock increased the stress level of the westernmost part of the Pütürge fault and of the adjacent Palu segment and as a result of an off-fault lobe.

中文翻译：

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来源建模和2020年1月24日，强地面运动的模拟中号_W¯¯ 6.8埃拉泽地震，土耳其

在24月2020的中号_{w ^}土耳其东部当地时间20:55（世界标准时间17:55）发生了6.8级地震，靠近Elazığ省Sivrice镇，造成建筑物中广泛的地震破坏。在这项研究中，我们分析了Elazığ地震过程中破裂过程和地震地面震动的主要特征。我们首先使用干涉合成孔径雷达（InSAR）干涉图（Sentinel-1卫星）来约束故障的几何形状和致病性断层的同震滑动分布。然后，我们利用此信息从峰值地面加速度（PGA），峰值地面速度（PGV）和频谱加速度方面分析主震的地面运动特征。该地震在近场中没有地震记录，这对研究区域地震地震动估算的计算施加了主要限制。为此，我们使用了一种随机的有限故障模拟方法来生成高频地面运动合成信号。中号_W¯¯ 6.8埃拉泽2020级地震。最后，我们使用库仑应力破坏函数变化评估了致病性断层段以及相邻段未破裂部分的潜在应力状态。大地测量数据的模型显示，2020年的Elazığ地震沿著名的左走向走滑东安纳托利亚断层带（EAFZ）沿Pütürge段破裂了两个主要的滑动斑块（总长约40 km），高达2.3 m的滑移和1.70的估计大地弯矩| $ \，\，\ times $ | 10 ¹⁹ Nm（相当于M _w6.8）。震中的位置支持了主震期间明显的WSW破裂方向性的证据。在地震动特征方面，我们观察到高频随机地震动模拟具有很好的能力来再现源复杂性，并捕获地震动衰减衰减随距离的变化，直至200 km。我们还证明，在没有强运动台且没有可用记录的震中地区，模拟地震图并未超出新土耳其建筑法规规定的与475年回归期相对应的设计频谱。最后，根据库仑应力分布计算，