Optical polarization-based seismic and water wave sensing on transoceanic cables
Optical polarization-based seismic and water wave sensing on transoceanic cables
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DOI：
10.1126/science.abe6648
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发表时间：
2021-02-26
期刊：
影响因子：
56.9
通讯作者：
Castellanos, Jorge C.
中科院分区：
文献类型：
--
作者：
Zhan, Zhongwen;Cantono, Mattia;Castellanos, Jorge C.
海底地球物理仪器的部署和维护具有挑战性，但对于研究海底地震和地球内部至关重要。能够利用海底电信电缆的新兴光纤传感技术为填补数据空白提供了机会。我们通过监测常规光学电信信道的偏振，成功地感知了连接加州的洛杉矶和智利瓦尔帕莱索的10，000米长的海底电缆上的地震波和水波。我们在10毫赫兹到5赫兹的频段内探测到了多个沿着电缆的中到大地震。我们还记录了压力信号从海洋涌浪的主要微震带，这意味着潜在的海啸传感。我们的方法，因为它不需要专门的设备，激光源，或专用光纤，是高度可扩展的全球海底电缆转换成连续的实时地震和海啸观测。
Seafloor geophysical instrumentation is challenging to deploy and maintain but critical for studying submarine earthquakes and Earth's interior. Emerging fiber-optic sensing technologies that can leverage submarine telecommunication cables present an opportunity to fill the data gap. We successfully sensed seismic and water waves over a 10,000-kilometer-long submarine cable connecting Los Angeles, California, and Valparaiso, Chile, by monitoring the polarization of regular optical telecommunication channels. We detected multiple moderate-to-large earthquakes along the cable in the 10-millihertz to 5-hertz band. We also recorded pressure signals from ocean swells in the primary microseism band, implying the potential for tsunami sensing. Our method, because it does not require specialized equipment, laser sources, or dedicated fibers, is highly scalable for converting global submarine cables into continuous real-time earthquake and tsunami observatories.