Influence of Fault Zone Maturity on Fully Dynamic Earthquake Cycles
Influence of Fault Zone Maturity on Fully Dynamic Earthquake Cycles
复制标题
断裂带成熟度对全动力地震周期的影响
DOI：
10.1029/2021gl094679
复制
发表时间：
2021-06
影响因子：
5.2
通讯作者：
P. Thakur;Yihe Huang
中科院分区：
文献类型：
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作者：
P. Thakur;Yihe Huang
通过模拟完全动态的地震循环，研究了二维垂直走滑断层对同震损伤演化和断层损伤带震间愈合的力学响应。我们的模型表明，在地震周期的断裂带结构演化可以有明显的影响锁定和蠕动断层段的力学行为。不成熟断层破坏带模型显示，在地震间隔期内，小、中地震的复发间隔不规则，且有大量的慢滑事件。相比之下，成熟的断层破坏带模型承载着脉冲状的地震破裂，可以传播到地表并延伸到整个孕震区，导致大的应力降、特征破裂程度和规则的复发间隔。我们的研究结果表明，断层带的地震间愈合和同震损伤积累可以解释成熟和未成熟断层带之间的地震行为的差异，并表明区域地震危险性和断层结构成熟度之间的联系。
We study the mechanical response of two‐dimensional vertical strike‐slip fault to coseismic damage evolution and interseismic healing of fault damage zones by simulating fully dynamic earthquake cycles. Our models show that fault zone structure evolution during the seismic cycle can have pronounced effects on mechanical behavior of locked and creeping fault segments. Immature fault damage zone models exhibit small and moderate subsurface earthquakes with irregular recurrence intervals and abundance of slow‐slip events during the interseismic period. In contrast, mature fault damage zone models host pulse‐like earthquake ruptures that can propagate to the surface and extend throughout the seismogenic zone, resulting in large stress drop, characteristic rupture extents, and regular recurrence intervals. Our results suggest that interseismic healing and coseismic damage accumulation in fault zones can explain the observed differences of earthquake behaviors between mature and immature fault zones and indicate a link between regional seismic hazard and fault structural maturity.