Episodic tremors and slip in Cascadia in the framework of the Frenkel‐Kontorova model
Episodic tremors and slip in Cascadia in the framework of the Frenkel‐Kontorova model
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Frenkel-Kontorova 模型框架内卡斯卡迪亚的阵发性震颤和滑移
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
K. Creager
中科院分区：
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作者：
N. Gershenzon;G. Bambakidis;E. Hauser;A. Ghosh;K. Creager
规则地震的地震矩与破裂时间的立方成正比。第二类现象，统称为慢地震，有非常不同的规模。我们提出了一个模型，灵感来自晶体中的位错动力学的现象学，这是一致的卡斯卡迪亚幕式震颤和滑动（ETS）事件中观察到的标度关系。ETS的两个基本特征是周期性和迁移性。在北方卡斯卡迪亚俯冲带，ETS事件每14.5个月左右出现一次。在这些事件中，地震以10 km/天的速度沿沿着走向迁移，同时以50 km/h的典型速度沿相对板块运动方向来回移动。我们的模型预测了板块边界上滑动脉冲序列的形成，它描述了断层动力学的主要特征，包括周期性和地震的迁移模式。
The seismic moment for regular earthquakes is proportional to the cube of rupture time. A second class of phenomena, collectively called slow earthquakes, has very different scaling. We propose a model, inspired from the phenomenology of dislocation dynamics in crystals, that is consistent with the scaling relations observed in the Cascadia episodic tremor and slip (ETS) events. Two fundamental features of ETS are periodicity and migration. In the northern Cascadia subduction zone, ETS events appear every 14.5 months or so. During these events, tremors migrate along‐strike with a velocity of 10 km/day and simultaneously zip back and forth in the relative plate‐motion direction with a typical velocity of 50 km/h. Our model predicts the formation of a sequence of slip pulses on the boundary of the plates, which describes the major features of fault dynamics, including periodicity and the migration pattern of tremors.