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Resetting of OSL/TL/ESR signals by frictional heating in experimentally sheared quartz gouge at seismic slip rates

机译:通过在地震滑动率下通过实验剪切的石英凿摩擦加热重置OSL / TL / ESR信号

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摘要

Recent studies on natural and experimental seismic faults have revealed that frictional heating plays an important role in earthquake dynamics. We report changes in the optically stimulated luminescence (OSL)/thermoluminescence (TL) and electron spin resonance (ESR) signals in quartz fault gouge (grain size 90-250 mu m, given dose 40 +/- 5 Gy) after frictional experiments. Our results indicate that high-rate (2.0 m/s) frictional heating during seismic events can reset the 'geologic clocks' of fault rocks. Thus, the OSL/TL/ESR signal in quartz from natural fault zones has the potential to directly constrain the age of seismic events. Whereas low-rate (2.0 mm/s) frictional slip, even over long times (1000 s), does not reset the OSL/TL signals in quartz. However, low-rate slip can reset the Al center ESR signal, but not the E' center signal.
机译:最近对自然和实验地震缺陷的研究表明,摩擦加热在地震动力学中起着重要作用。 在摩擦实验后,我们报告光学刺激的发光(OSL)/热致发光(TL)和电子自旋共振(ESR)信号中的电子自旋共振(ESR)信号。 我们的结果表明,地震事件期间的高速(2.0米/秒)摩擦加热可以重置故障岩石的“地质时钟”。 因此,来自自然故障区的石英中的OSL / TL / ESR信号有可能直接限制地震事件的年龄。 而低速(2.0 mm / s)摩擦滑动,即使在长时间(1000秒),也不会在石英中重置OSL / TL信号。 但是,低速率滑动可以重置AL中心ESR信号,但不是E'中心信号。

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