Seafloor Fiber Optic Array in Monterey Bay (SEAFOAM)

蒙特利湾海底光纤阵列 (SEAFOAM)

• 批准号: 2023301
• 负责人: Gregory Beroza
• 金额: $ 66.62万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2023301&HistoricalAwards=false
• 关键词: Seafloor; Fiber; Optic; Array; Monterey

The ocean covers 70% of the surface of our planet, but the underwater environment is limited by access and by exceptionally high costs and complex logistics. Yet, underwater measurements are crucial for offshore seismic hazard, tsunami and earthquake early warning, submarine volcano science, and crustal and deep earth imaging. Strategies explored so far to access the seafloor require expensive field campaigns, including several days to weeks of ship time, and long-term management either of cabled nodes, ships, or instrument pools. Upscaling any strategy to monitor the seafloor worldwide is difficult to envision. Fiber-optic sensing provides a novel promising avenue for making high-resolution seafloor measurements offshore and tackling the scientific questions that cannot be answered otherwise.Following recent short-time successful experiments offshore, this research proposes to develop the first continuously operating Distributed Acoustic Sensing (DAS) experiment in a marine environment using the Monterey Accelerated Research System (MARS) cable in Monterey Bay, CA. The Seafloor seismology with a Fiber-Optic Array in Monterey Bay (SEAFOAM) project will demonstrate, calibrate, use, and expand the capabilities of fiber-optic sensing in marine geophysics, including growing the DAS user community through release of open access data. The project consists of a 1-year experiment with the MARS cable in order to record earthquakes, and extend our knowledge of the ambient seismic background wavefield recording interval over several tidal, storm, and seasonal cycles. This project will also deliver a software-hardware system that will provide an example pathway for continuous, real-time, open DAS data streaming to a seismological data archive.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

海洋覆盖了地球表面 70% 的面积，但水下环境却受到通道、极高成本和复杂物流的限制。然而，水下测量对于近海地震灾害、海啸和地震预警、海底火山科学以及地壳和地球深层成像至关重要。迄今为止探索的进入海底的策略需要昂贵的现场活动，包括几天到几周的航行时间，以及对电缆节点、船舶或仪器池的长期管理。很难想象要升级任何监测全球海底的策略。光纤传感为近海高分辨率海底测量和解决无法用其他方法解决的科学问题提供了一种新的有前景的途径。继最近在海上进行的短期成功实验之后，本研究建议开发第一个连续运行的分布式声学传感（ DAS）使用位于加利福尼亚州蒙特利湾的蒙特利加速研究系统 (MARS) 电缆在海洋环境中进行实验。蒙特利湾光纤阵列海底地震学 (SEAFOAM) 项目将展示、校准、使用和扩展光纤传感在海洋地球物理学中的功能，包括通过发布开放访问数据来发展 DAS 用户社区。该项目包括使用 MARS 电缆进行为期 1 年的实验，以记录地震，并扩展我们对多个潮汐、风暴和季节周期的环境地震背景波场记录间隔的了解。该项目还将提供一个软件硬件系统，该系统将为连续、实时、开放的 DAS 数据流传输到地震数据档案提供示例路径。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

SeaFOAM: A Year-Long DAS Deployment in Monterey Bay, California

• DOI: 10.1785/0220230047
• 发表时间: 2023-06
• 期刊: Seismological Research Letters
• 影响因子: 3.3
• 作者: B. Romanowicz;R. Allen;K. Brekke;Li-Wei Chen;Yuancong Gou;I. Henson;Julien Marty;D. Neuhauser;Brian Pardini;T. Taira;Stephen Thompson;Junli Zhang;S. Zuzlewski