断层修复促进了实验室实验和自然断层中的高频地震
Gregory C McLaskey1, Amanda M Thomas, Steven D Glaser
1Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, USA. gmclaskey@usgs.gov
Nature
|November 7, 2012
概括
断层随着时间的推移而愈合,影响地震的特性. 愈合的增加会在破裂过程中产生更多的高频地震辐射,影响地震的光谱特征.
科学领域:
- * 固体地球地质物理学和地震学.
- * 调查断裂力学和地震发生.
背景情况:
- * 断层在静止接触时会加强或愈合,这可能是地震发生的关键过程.
- * 实验室研究表明,愈合涉及热激活的机制接微观接触在断层表面.
- * 实验室治疗测量与可观测的地震特性之间的联系尚不清楚.
研究的目的:
- * 调查故障愈合时间和地震的光谱特性之间的关系.
- *将故障修复的实验室发现与自然地震的地震观测联系起来.
主要方法:
- *实验室实验模拟在受控条件下的故障修复.
- *从实验室实验中对地震光谱属性的分析.
- *在自然断层上检查重复的地震序列,以将光谱与复发时间相关联.
主要成果:
- *实验室实验表明,故障愈合的增加导致破裂期间高频地震辐射的产生不成比例地增加.
- *在自然断层的重复地震中观察到地震光谱和复发间隔之间的类似相关性.
- * 治愈速度受到压力,温度和矿物学的影响.
结论:
- *故障修复显著影响地震期间地震辐射的高频含量.
- *这项研究确定了故障修复,地震光谱和复发时间之间的联系.
- *这些发现可能有助于解释地震辐射位置和大规模地震中的滑动位置之间的差异.
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