东北奥基断层的低地震摩擦力是从温度测量中确定的
P M Fulton1, E E Brodsky, Y Kano
1Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA.
概括
研究人员使用钻井温度观测台测量了东北奥基地震后的断层摩擦. 该研究发现表面摩擦系数较低,为地震动态和断层行为提供了新的见解.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 板块构造学是一种板块构造学.
背景情况:
- 断层摩擦显著影响地震动态和能量消耗.
- 测量地震后断层温度可以揭示摩擦过程的洞察力.
- 2011年东北奥基地震造成了日本沟板边界的重大滑动.
研究的目的:
- 在东北大震期间量化断层上的摩擦阻力.
- 为了研究散射的能量和故障温度之间的关系.
- 为了确定板边界的表面摩擦系数.
主要方法:
- 在日本沟断层上安装一个钻井温度观测台.
- 在地震发生后9个月监测温度异常.
- 分析温度数据以计算散射能量和表面摩擦.
主要成果:
- 在板块边界断层检测到0.31°C的温度异常.
- 这种异常对应于27MJ/m2的地震期间散射的能量.
- 计算出的表面摩擦系数为0.08.
结论:
- 在东北奥基地震期间的表面摩擦系数明显低于岩石的典型静态摩擦值.
- 这一发现对理解地震能量释放和断层滑动行为有意义.
- 钻孔温度测量为估计地震摩擦提供了有价值的方法.
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