Irregular rupture process of the 2022 Taitung, Taiwan, earthquake sequence.
Irregular rupture process of the 2022 Taitung, Taiwan, earthquake sequence.
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DOI：
10.1038/s41598-023-27384-y
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发表时间：
2023-01-20
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
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作者：
2022年9月，台湾东南部台东县发生了两次破坏性地震，震级分别为矩震级（Mw）6.6（前震）和7.1（主震）。为了了解它们复杂的破裂过程，我们使用势密度张量反演方法分析了这些地震，该方法可以稳定地估计破裂传播过程，包括断层几何形状，而不会过度拟合数据。分析表明，前震的主要破裂向浅深度传播，在南-西南方向，最初的破裂向断层的较深部分传播。主震的震中位于前震的东北偏北一侧，由两个不同的事件组成。在第一幕（0-10秒），最初的破裂传播北-东北，通过一个深的路径，其次是主要的破裂，在北-东北和南-西南方向传播双边。第二次破裂事件（10-16 s）开始于主震震中附近，破裂向断层浅侧传播。结果表明，在前震与主震第一破裂幕之间的高破裂面能量区，前震和主震第一破裂幕的应力集中可能导致了第二破裂幕的发生。前震和主震的不规则破裂过程可能反映了震源区应力和结构的不均匀性。
In September 2022, two destructive earthquakes of moment magnitude (Mw) 6.6 (foreshock) and 7.1 (mainshock) occurred in Taitung County, south-eastern Taiwan. To understand their complex rupture processes, we analysed these earthquakes using the Potency Density Tensor Inversion method, which can stably estimate the rupture propagation process, including fault geometry, without overfitting the data. The analyses revealed that the major rupture of the foreshock propagated towards shallow depth, in a south–southwest direction, following an initial rupture that propagated towards the deeper part of the fault. The mainshock, with its epicentre on the north–northeast side of that of the foreshock, consists of two distinct episodes. During the first episode (0–10 s), the initial rupture propagated north–northeast, through a deep path, followed by the main rupture that propagated bilaterally in a north–northeast and south–southwest direction. The second rupture episode (10–16 s) started near the hypocentre of the mainshock, and the rupture propagated towards the shallow side of the fault. The results suggest that the stress concentration from both the foreshock and mainshock’s first rupture episode may have caused the second rupture episode in the high fracture surface energy area between the foreshock and the first rupture episode of the mainshock. The irregular rupture process of the foreshock and mainshock may reflect the heterogeneity of stress and structure in the source region.
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