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A modified specific barrier model based on new time functions and approach for cracks location on the fault plane: application to the 2008 Iwate–Miyagi earthquake
Geophysical Journal International ( IF 2.8 ) Pub Date : 2021-05-28 , DOI: 10.1093/gji/ggab212
Mohammad Hadi Rezaei 1 , Naser Khaji 2 , Rosa Di Maio 3 , Antonio Emolo 4
Affiliation  

SUMMARY Specific barrier method (SBM) is a method used for ground motion generation from a finite fault surface. It is based on a regular distribution of rupturing circular subevents located on the fault plane and random arrival times of the waves generated by those cracks. This approach does not consider the whole rupture kinematics, that is the rupture propagation from the hypocentre to the subevents, and leaves parts of the fault unbroken (barriers). In this paper, we propose a modified version of the SBM for generation of synthetic ground motions from a fault surface. In this version, we modify the probability density function (PDF) for the arrival time of the waves coming from different parts of the fault in order to better account for the fault kinematics and the distance between fault point and receiver. In this way, we can simulate the middle part of the acceleration spectrum (i.e. between 0.1 and 7 Hz) with more accuracy. Moreover, a new arrangement for locating cracks throughout the fault plane is proposed to add flexibility to the model and enable it to make the part of the spectrum with frequency larger than 7 Hz more like what happens in nature. In such an arrangement, called geometry packing in this paper, the size of circles varies within a chosen specific allowable range, while the circles cover all over the fault plane without any overlaps. To validate the proposed modified SBM technique, the synthetic Fourier spectra are compared with recordings of the 2008 Mw6.9 Iwate–Miyagi (Japan) earthquake. Finally, we present some parametric studies to show how different features of the proposed PDFs affect the results from the SBM approach.

中文翻译:

基于新时间函数和方法的断层面裂缝定位修正特定障碍模型:在 2008 年岩手宫城地震中的应用

发明内容特定障碍法(SBM)是一种用于从有限断层表面产生地震动的方法。它基于位于断层面上的破裂圆形子事件的规则分布和由这些裂缝产生的波的随机到达时间。这种方法不考虑整个破裂运动学,即从震源到子事件的破裂传播,并保留部分断层未破裂(障碍)。在本文中,我们提出了 SBM 的修改版本,用于从断层表面生成合成地震动。在这个版本中,我们修改了来自断层不同部分的波到达时间的概率密度函数 (PDF),以便更好地考虑断层运动学和断层点与接收器之间的距离。这样,我们可以更准确地模拟加速度谱的中间部分(即 0.1 和 7 Hz 之间)。此外,提出了一种用于在整个断层面定位裂缝的新布置,以增加模型的灵活性,使其能够使频率大于 7 Hz 的频谱部分更像自然界发生的情况。在这种布置中,在本文中称为几何填充,圆圈的大小在选定的特定允许范围内变化,而圆圈覆盖整个断层面,没有任何重叠。为了验证提出的改进 SBM 技术,将合成傅里叶光谱与 2008 年 Mw6.9 岩手-宫城(日本)地震的记录进行了比较。最后,我们提出了一些参数研究,以展示所提出的 PDF 的不同特征如何影响 SBM 方法的结果。
更新日期:2021-05-28
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