Going to Any Lengths: Solving for Fault Size and Fractal Slip for the 2016, M w 6.2 Central Tottori Earthquake, Japan, Using a Transdimensional Inversion Scheme
Going to Any Lengths: Solving for Fault Size and Fractal Slip for the 2016, M w 6.2 Central Tottori Earthquake, Japan, Using a Transdimensional Inversion Scheme
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不遗余力：使用跨维反演方案求解 2016 年日本鸟取县中部 M w 6.2 地震的断层大小和分形滑移
DOI：
10.1029/2018jb016434
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发表时间：
2019
期刊：
影响因子：
3.4
通讯作者：
Amey R
中科院分区：
文献类型：
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作者：
Amey R
包括滑动在内的许多地震属性都表现出自相似（分形）特征。我们可以通过von Karman相关将自相似性纳入贝叶斯滑动反演中，以便应用的正则化代表观察到的断层特征。在von Karman正则化中，每个滑移补丁与每个其他补丁都有关系。这意味着冯卡门正则化只有在应用于实际滑动的补丁时才有意义;如果应用于非滑动补丁，则可以添加虚假滑动以满足冯卡门相关性标准。此外，故障的大小，通常事先选择，也会影响冯卡门相关长度，这意味着最终的滑动解决方案可能会受到初始几何形状的选择。在这里，我们提出了一种方法，用于解决在滑移反演过程中的断层面的大小，以及滑移，倾角，和一个超参数控制滑移方差。我们使用一个transdimensional贝叶斯反演方案约束的大地表面位移和正则化使用冯卡门相关。我们使用圆调和函数来求解滑动区域的大小，以允许跨断层连接和连续的复杂形状。我们将该方法应用于2016年Mw6.2日本鸟取中部地震，由干涉合成孔径雷达干涉合成孔径雷达（哨兵-1和ALOS-2）和全球导航卫星系统（GNSS）数据的约束。我们发现一个滑动区域从大约2公里到10公里的深度延伸，滑动区域在下倾方向延长。与一些地震研究相反，我们发现滑动破裂了大部分孕震层。
Many earthquake properties, including slip, show self‐similar (fractal) features. We can incorporate self‐similarity into Bayesian slip inversions via von Karman correlation, so that the regularization applied is representative of observed fault features. In von Karman regularization, each slip patch has a relationship to every other patch. This means that von Karman regularization only has meaning when applied to patches that actually slipped; if applied to nonslipping patches, spurious slip can be added to meet the von Karman correlation criteria. Additionally, the fault size, usually chosen in advance, also affects the von Karman correlation lengths meaning that the final slip solution may be biased by initial geometry choices. Here we present a method for solving for the size of the fault plane during the slip inversion process, as well as slip, rake, and a hyperparameter controlling slip variance. We use a transdimensional Bayesian inversion scheme constrained by geodetic surface displacements and regularized using von Karman correlation. We use circular harmonics to solve for the size of the slipping area, to allow for a complex shape that is connected and continuous across the fault. We apply this method to the 2016Mw6.2 Central Tottori earthquake, Japan, constrained by interferometric synthetic aperture radar InSAR (Sentinel‐1 and ALOS‐2) and Global Navigation Satellite System data (GNSS). We find an area of slip extending from approximately 2‐ to 10‐km depth, with the slipping area elongated in the downdip direction. In contrast to some seismic studies, we find slip ruptured most of the seismogenic layer.