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Seismogenic and tremorgenic slow slip near the stability transition of frictional sliding
Earth and Planetary Science Letters ( IF 5.3 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.epsl.2021.117037
Shiying Nie , Sylvain Barbot

Slow-slip events and tremors occur below the seismogenic zone of major plate boundaries. While the physics of aseismic slow-slip events is relatively well understood, the mechanics of seismogenic slow slip remains elusive because the conditions leading to slow or fast ruptures are thought to be mutually exclusive. Here, we explore fault dynamics in the parametric space of frictional conditions to show that seismogenic slow-slip events are the natural behavior of homogeneous faults, as long as the velocity dependence approaches velocity neutral with a small characteristic nucleation size. Tremors can originate from rapid bursts of slow earthquakes that are triggered as the slow-slip rupture spreads over small-scale asperities. The near velocity-neutral conditions explain the underlying mechanics of collocated slow and fast slip of seismogenic slow-slip events commonly found below the seismogenic zone. The presence of material heterogeneity may explain the spatio-temporal clustering and migration features of tremor activity.



中文翻译:

摩擦滑动稳定过渡附近的震震慢滑移

慢滑事件和地震发生在主要板块边界的地震带之下。虽然抗震慢滑事件的物理学相对比较好理解,但地震慢滑的力学仍然难以捉摸,因为导致缓慢或快速破裂的条件被认为是相互排斥的。在这里,我们在摩擦条件的参数空间中探索断层动力学,以表明只要速度依赖性接近速度中性且特征成核大小较小,地震慢滑事件就是均质断层的自然行为。震颤可能源于缓慢地震的快速爆发,这些地震是由于慢滑破裂蔓延到小规模的凹凸不平而引发的。接近速度中性的条件解释了通常在发震带下方发现的发震慢滑事件的并置慢滑和快滑的基本机制。物质异质性的存在可以解释震颤活动的时空聚集和迁移特征。

更新日期:2021-06-18
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