An Explanation of Episodic Tremor and Slow Slip Constrained by Crack‐Seal Veins and Viscous Shear in Subduction Mélange

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タイトル別名
  • An Explanation of Episodic Tremor and Slow Slip Constrained by Crack-Seal Veins and Viscous Shear in Subduction Melange
  • An explanation of episodic tremor and slow slip constrained by crack-seal veins and viscous shear in subduction mélange
  • An explanation for episodic tremor and slow slip constrained by crack-seal veins and viscous shear in subduction mélange
公開日
2018-06
資源種別
journal article
権利情報
  • (c) 2018. American Geophysical Union.
DOI
  • 10.1029/2018gl078374
公開者
American Geophysical Union

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説明

<jats:title>Abstract</jats:title><jats:p>Episodic tremor and slow slip (ETS) occurs in the transition zone between the locked seismogenic zone and the deeper, stably sliding zone. Actual mechanisms of ETS are enigmatic, caused by lack of geological observations and limited spatial resolution of geophysical information from the ETS source. We report that quartz‐filled, crack‐seal shear and extension veins in subduction mélange record repeated low‐angle thrust‐sense frictional sliding and tensile fracturing at near‐lithostatic fluid pressures. Crack‐seal veins were coeval with viscous shear zones that accommodated deformation by pressure solution creep. The minimum time interval between thrusting events, determined from a kinetic model of quartz precipitation in shear veins, was less than a few years. This short recurrence time of low‐angle brittle thrusting at near‐lithostatic fluid overpressures within viscous shear zones may be explained by frequent release of accumulated strain by ETS.</jats:p>

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