通过深光纤分布式声学传感照明海底断层和海洋动态
Nathaniel J Lindsey1,2, T Craig Dawe3, Jonathan B Ajo-Franklin2,4
1Earth and Planetary Science Department, University of California, Berkeley, 300 McCone Hall, Berkeley, CA 94720, USA. natelindsey@berkeley.edu.
Science (New York, N.Y.)
|November 30, 2019
概括
使用暗光纤电缆的分布式声学传感 (DAS) 检测了海底断层区域和各种海洋现象,包括波动力学和沉积物运输. 这项技术为海洋地质物理研究提供了一种新的方法.
科学领域:
- 地质学
- 海洋学
- 地震学
背景情况:
- 现有的海底光纤电缆 (暗光纤) 可以用于地球物理监测.
- 分布式光纤传感为大规模环境观测提供了一种具有成本效益的方法.
研究的目的:
- 调查在海底电缆上部署的分布式声学传感 (DAS) 对海洋地质物理现象的有用性.
- 用一个新的,长期的DAS阵列来描述地震波场和环境海洋噪音.
主要方法:
- 在陆上部署了分布式声学传感仪器 (DAS),使用20公里的海底光纤电缆.
- 创建了一个大约1万个组件的地震阵列来记录4天内地震波场和环境海洋噪音.
主要成果:
- 通过记录小地震确定了多个海底断层区域.
- 在现场观察到的次要微地震产生,低潮后的钻孔,风暴诱导的沉积物运输,低重力波和内部波的破裂.
- 使用微地震频段的DAS振幅追踪风暴周期中的海域动态.
结论:
- 分布式声学传感 (DAS) 与海底暗光纤相结合, 是海洋地质物理学的强大工具.
- 这种方法可以详细观察固体地球和海洋学过程.
- 突出了持续大规模监测海洋环境的潜力.
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