Experimental investigations on dating the last earthquake event using OSL signals of quartz from fault gouges

Experimental investigations on dating the last earthquake event using OSL signals of quartz from fault gouges
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利用断层泥石英光释光信号测定上次地震事件的实验研究

DOI:
10.1016/j.tecto.2019.228191
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发表时间:
2019
期刊:
影响因子:
2.9
通讯作者:
Kitamura Manami
Kitamura Manami
中科院分区:
地球科学2区
文献类型:
--
作者:
Kim Jae Hoon;Ree Jin-Han;Choi Jeong-Heon;Chauhan Naveen;Hirose Takehiro;Kitamura Manami

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获得沿活动断层的最新地震滑移事件的可靠年龄对于地震危险性评估非常重要。在这里,我们观察到由于人工断层泥(由石英颗粒和钙膨润土粉末组成的混合物)中的摩擦加热而引起的石英晶体光激发光(OSL)信号的变化。使用高速旋转剪切装置在室温和室内湿度下使断层泥变形。在地震滑移率为 1.31m·s−1 时,沿着模拟断层带(1mm 厚)内的非常薄的层(~300μm 厚)发生强烈滑移局部化。滑动局部层 (SLL) 的估计温度因摩擦加热而增加了约 475°C。凿孔的石英 OSL 信号已完全重置,尤其是 SLL。相比之下,在次震滑移速率(0.06–0.001m·s−1)下存在罕见的滑移局部化,因此 SLL 中的估计温升约为 120°C;因此,在这种情况下石英 OSL 信号不会重置。结果表明,石英 OSL 测年可用于限制发生 SLL 的天然石英断层带中最新地震事件的年龄。
Obtaining a reliable age of the latest seismic slip event along an active fault is important for seismic hazard assessment. Here, we observe changes in the optically stimulated luminescence (OSL) signal of quartz crystals due to frictional heating in artificial fault gouges (comprising a mixture of quartz grains and Ca-bentonite powder). The fault gouge was deformed using a high-velocity rotary-shear apparatus at room temperature and room humidity. At a seismic slip rate of 1.31 m·s−1, intense slip localization occurred along a very thin layer (~300 μm thick) within the simulated fault zones (1 mm thick). The estimated temperature of the slip-localized layer (SLL) increased by ~475 °C from frictional heating. The quartz OSL signals of the gouges were fully reset, most noticeably for the SLL. In contrast, there was rare slip-localization at subseismic slip rates (0.06–0.001 m·s−1), for which the estimated temperature rise in the SLL was ~120 °C; hence, the quartz OSL signal was not reset under this condition. The results suggest that quartz OSL dating can be used to constrain the age of the latest seismic event in natural quartz-bearing fault zones where a SLL occurs.
高速断层滑动过程中及滑动后滑动速度和温度对渗透率影响的实验研究
DOI: 10.1016/j.jsg.2011.08.013
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