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Ultrastable laser interferometry for earthquake detection with terrestrial and submarine cables
Science ( IF 56.9 ) Pub Date : 2018-06-14 , DOI: 10.1126/science.aat4458
Giuseppe Marra 1 , Cecilia Clivati 2 , Richard Luckett 3 , Anna Tampellini 2, 4 , Jochen Kronjäger 1 , Louise Wright 1 , Alberto Mura 2 , Filippo Levi 2 , Stephen Robinson 1 , André Xuereb 5 , Brian Baptie 3 , Davide Calonico 2
Affiliation  

Submarine fiber optic earthquake detection Seismic networks detect earthquakes and are common on continents, where they are easy to install. However, most of Earth's surface is under the oceans, where placing seismometers is difficult. Marra et al. now find that ordinary submarine telecommunication cables can be used to detect earthquakes. Small strain changes associated with the passage of seismic waves were detected with laser light sent through in-use fiber optic cables by ultrastable lasers. This strategy could turn intercontinental fiber optic cables into ocean-bottom strain sensors, dramatically improving our ability to record earthquakes. Science, this issue p. 486 Ultrastable lasers can be used to detect earthquakes in land-based and submarine fiber optic cables. Detecting ocean-floor seismic activity is crucial for our understanding of the interior structure and dynamic behavior of Earth. However, 70% of the planet’s surface is covered by water, and seismometer coverage is limited to a handful of permanent ocean bottom stations. We show that existing telecommunication optical fiber cables can detect seismic events when combined with state-of-the-art frequency metrology techniques by using the fiber itself as the sensing element. We detected earthquakes over terrestrial and submarine links with lengths ranging from 75 to 535 kilometers and a geographical distance from the earthquake’s epicenter ranging from 25 to 18,500 kilometers. Implementing a global seismic network for real-time detection of underwater earthquakes requires applying the proposed technique to the existing extensive submarine optical fiber network.

中文翻译:

用于陆地和海底电缆地震检测的超稳定激光干涉测量法

海底光纤地震检测地震网络检测地震,在大陆很常见,在那里它们很容易安装。然而,地球表面的大部分都在海洋之下,在那里放置地震仪很困难。马拉等人。现在发现普通的海底电信电缆可以用来探测地震。用超稳定激光器通过使用中的光纤电缆发送的激光检测到与地震波通过相关的微小应变变化。这种策略可以将洲际光缆变成海底应变传感器,显着提高我们记录地震的能力。科学,这个问题 p。486 超稳激光器可用于检测陆基和海底光纤电缆中的地震。探测海底地震活动对于我们了解地球的内部结构和动态行为至关重要。然而,地球表面 70% 被水覆盖,地震仪的覆盖范围仅限于少数永久性海底站。我们表明,现有的电信光纤电缆可以通过使用光纤本身作为传感元件与最先进的频率计量技术相结合来检测地震事件。我们在陆地和海底链路上检测到地震,地震长度范围为 75 至 535 公里,距地震震中的地理距离范围为 25 至 18,500 公里。
更新日期:2018-06-14
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