CGF-Svalbard

This data set contains distributed acoustic sensing data collected during February 2023. It contains resampled strain data in strain unit measured by one OptoDAS interrogator through a dark fiber in a submarine telecommunication cable, which was trenched into soft sediments at 0-2 m below the seafloor from Ny-Ålesund towards Longyearbyen in Svalbard, Norway. The first 50 km of telecommunication cable was interrogated. The data are 152 1-hour segments. Each segment contains an earthquake of magnitude five and above, which has been converted to strain unit. To reduce file sizes, we resampled the raw data with an antialiasing filter from 625 Hz to 100 Hz and extracted channels every 24 m. The archived versions have a total size of 860 GB. A Tukey taper with a taper rate of 0.05 was applied before resampling to avoid artifacts. The processed data are stored as structured arrays in MATLAB file format (.mat). This data set has no exact positioning data of the fiber optic cable because they are proprietary to SIKT.

本数据集包含2023年2月采集的分布式声学传感（Distributed Acoustic Sensing, DAS）数据。其中包含以应变单位为量纲的重采样应变数据，该数据由一台OptoDAS解调仪通过挪威斯瓦尔巴群岛新奥尔松（Ny-Ålesund）至朗伊尔城（Longyearbyen）方向海底通信光缆中的暗光纤采集获取，该光缆埋设于海底以下0-2米深的软沉积物中。本次解调覆盖了该通信光缆的前50千米段。数据集共包含152段1小时时长的数据，每段均包含1个震级5级及以上的地震事件数据，且所有数据均已转换为应变单位。为压缩文件体积，研究人员采用抗混叠滤波器将原始数据从625赫兹重采样至100赫兹，并以24米为间隔提取信道数据。为避免产生采集伪影，重采样前已施加锥度率为0.05的图基锥窗（Tukey taper）。归档后的数据集总容量为860吉字节（GB）。处理后的数据以结构化数组形式存储于MATLAB文件格式（.mat）文件中。本数据集未提供该光缆的精确定位数据，因该数据属于SIKT公司的专有信息。