Distributed acoustic sensing for seismic activity monitoring
Distributed acoustic sensing for seismic activity monitoring
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DOI：
10.1063/1.5139602
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发表时间：
2020-03-01
期刊：
影响因子：
5.6
通讯作者：
Martins, Hugo F.
中科院分区：
文献类型：
--
作者：
Fernandez-Ruiz, Maria R.;Soto, Marcelo A.;Martins, Hugo F.
连续、实时监测地球仪周围的地表地震活动，对于获得对全球层析成像分析的新见解和识别导致潜在危险情况的地震模式具有极大的意义。已经存在的电信光纤网络作为该应用的理想解决方案而出现，这是由于其普遍性和光纤以相对低的成本执行分布式、高灵敏度振动监测的能力（以最少的新设备部署获得超高密度的点传感器）。这篇前瞻性文章讨论了光纤分布式声学传感器（DAS）用于地震活动监测的早期方法。DAS技术在这些应用中的好处和潜在影响在这里说明了新的实验结果的基础上的一个特定的方法：所谓的啁啾脉冲DAS的反地震监测。该技术提供了有前途的前景，地震层析成像领域，由于其有吸引力的性质，在简单性，一致的灵敏度，跨传感通道，和鲁棒性。此外，我们还报告了几种信号处理技术，容易适用于啁啾脉冲DAS记录提取相关的地震信息，从周围的声学噪声。这里提出的结果可以作为一个新的概念，无处不在的地震监测以最小的投资的基础。
Continuous, real-time monitoring of surface seismic activity around the globe is of great interest for acquiring new insight into global tomography analyses and for recognition of seismic patterns leading to potentially hazardous situations. The already-existing telecommunication fiber optic network arises as an ideal solution for this application, owing to its ubiquity and the capacity of optical fibers to perform distributed, highly sensitive monitoring of vibrations at relatively low cost (ultra-high density of point sensors available with minimal deployment of new equipment). This perspective article discusses early approaches on the application of fiber-optic distributed acoustic sensors (DASs) for seismic activity monitoring. The benefits and potential impact of DAS technology in these kinds of applications are here illustrated with new experimental results on teleseism monitoring based on a specific approach: the so-called chirped-pulse DAS. This technology offers promising prospects for the field of seismic tomography due to its appealing properties in terms of simplicity, consistent sensitivity across sensing channels, and robustness. Furthermore, we also report on several signal processing techniques readily applicable to chirped-pulse DAS recordings for extracting relevant seismic information from ambient acoustic noise. The outcome presented here may serve as a foundation for a novel conception for ubiquitous seismic monitoring with minimal investment.