Effects of incoming polygonal fault systems on subduction zone and slow slip behavior

IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Maomao Wang, Philip M. Barnes, Demian Saffer, Gregory F. Moore, Haoran Ma, Ming Wang, Jinbao Su
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引用次数: 0

Abstract

The physical properties of subduction inputs profoundly influence megathrust slip behavior. Seismic data reveal extensive polygonal fault systems (PFSs) in the input sequences of the Hikurangi Margin and Nankai Trough. The mechanical and hydrological effects of these incoming PFSs on subduction zones are potentially substantial. Here, we investigate their effects following transport into the accretionary wedge by integrating discrete-element modeling with three-dimensional seismic interpretation. We find that the typical dips of the incoming PFSs overlap with modeled dips prone to reactivation and confirm that subducting PFSs can be reactivated and gradually evolve into major thrust faults. Comparisons with electromagnetic data indicate that PFSs may provide conduits for fluid leakage along the plate interface, coincide with disrupted strata and decreased shear stress, and enhance geometric and stress heterogeneity along the megathrust. These suggest that PFSs may play a previously unrecognized role in contributing to shallow slow earthquake phenomena in subduction zones.

Abstract Image

传入的多边形断裂系统对俯冲带和慢滑行为的影响
俯冲输入的物理性质深刻地影响着巨型逆冲滑动行为。地震资料显示,在Hikurangi边缘和南开海槽的输入序列中存在广泛的多边形断裂系统。这些进入的PFSs对俯冲带的机械和水文影响可能是巨大的。在这里,我们通过将离散元模型与三维地震解释相结合,研究了它们在进入吸积楔后的影响。研究发现,进入的pfs的典型倾角与模拟的容易再激活的倾角重叠,证实了俯冲的pfs可以再激活并逐渐演化为主要逆冲断层。与电磁数据的对比表明,pfs可能为流体沿板块界面泄漏提供了通道,与断裂地层重合,剪应力降低,增强了大逆冲构造的几何和应力非均质性。这些结果表明,pfs可能在俯冲带浅层缓慢地震现象中发挥了以前未被认识到的作用。
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来源期刊
Science Advances
Science Advances 综合性期刊-综合性期刊
CiteScore
21.40
自引率
1.50%
发文量
1937
审稿时长
29 weeks
期刊介绍: Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.
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