Aftershocks due to property variations in the fault zone: A mechanical model

Aftershocks due to property variations in the fault zone: A mechanical model
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断层带性质变化引起的余震:力学模型

DOI:
10.1016/j.tecto.2012.12.013
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发表时间:
2013-03
期刊:
影响因子:
2.9
通讯作者:
Caibo Hu, Yongen Cai, Mian Liu, Zhenming Wang
Caibo Hu, Yongen Cai, Mian Liu, Zhenming Wang
中科院分区:
地球科学2区
文献类型:
--
作者:
Caibo Hu, Yongen Cai, Mian Liu, Zhenming Wang

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许多大型走滑地震的研究表明,地震活动率在库仑应力因地震破裂而增加的象限中增加。这一机制解释了余震在断层破裂尖端附近的集中,但不能解释破裂带两侧的余震,那里的余震通常很丰富。我们认为这些余震可能是由断层带性质的变化引起的,而这些变化在以前的模型中并不包括在内。在一个有限元模型,把破裂面作为一个区域与非均匀的物理性质,建议由现场观测和实验室实验,库仑应力变化触发的主震不再均匀地减少破裂带的两侧,但显示复杂的模式的负和正的变化。这些结果可以解释主震破裂两侧的一些余震。
Studies of many large strike-slip earthquakes have shown that the seismicity rate increases in quadrants in which the Coulomb stress is increased by the earthquake rupture. This mechanism explains the concentration of aftershocks near the tips of the fault rupture, but cannot explain the aftershocks on the sides of the rupture zone, where the aftershocks are commonly abundant. We suggest that these aftershocks may be induced by variations of fault-zone properties not included in the previous models. In a finite-element model that treats the rupture plane as a zone with heterogeneous physical properties, as suggested by field observations and laboratory experiments, the Coulomb-stress changes triggered by the mainshock no longer uniformly decrease on the sides of the rupture zone, but show complex patterns of negative and positive changes. These results may explain some of the aftershocks on the sides of the mainshock rupture.
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