Three underwater fiber-optic cables offshore of central Chile
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The F1 network code includes selected broadband velocimetric data collected from three DAS instruments of the OptoDAS type, manufactured by ASN (Alcatel Submarine Networks). These instruments interrogate three underwater fiber-optic cables offshore of central Chile, spanning 400 km (from 5 m above sea level to 2000 m below sea level). The original DAS data is recorded as strain rate, with a spatial sampling interval of 15 m, resulting in 26,664 virtual sensors along the fibers. Two instruments operate at a sampling rate of 62.5 Hz, while one operates at 100 Hz. Downsampling and conversion to velocity are performed directly on the instruments. The resulting network delivers single-component broadband ground velocity measurements every 5 km, yielding a total of 80 virtual stations.Real-time transmission is made through a SeedLink protocol in the MiniSEED format from the instruments. The metadata complies with the FDSN MiniSEED 2.6 norm. This project is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 101041092 – ABYSS). It involves a close collaboration with the Chilean Centro Sismológico Nacional (CSN) and the University of Chile.
F1网络代码包含由ASN（阿尔卡特海底网络公司，Alcatel Submarine Networks）生产的三台OptoDAS型分布式声学传感（Distributed Acoustic Sensing, DAS）仪器采集的精选宽带测速数据集。这些仪器监测智利中部近海的三条海底光缆，光缆总长400千米，覆盖范围从海平面以上5米至海平面以下2000米。 原始DAS数据以应变速率为记录量，空间采样间隔为15米，沿光纤共生成26664个虚拟传感器。其中两台仪器的采样率为62.5赫兹，剩余一台的采样率为100赫兹。 仪器端直接完成降采样与速度转换处理。最终构建的F1网络可每隔5千米输出单分量宽带地面速度测量数据，共计80个虚拟台站。数据通过SeedLink协议以MiniSEED格式实现实时传输，元数据符合国际数字地震台网联合会（Federation of Digital Seismic Networks, FDSN）制定的MiniSEED 2.6标准。 本项目获得欧盟“地平线2020”研究与创新计划框架下的欧洲研究委员会（European Research Council, ERC）资助（资助协议编号：101041092 – ABYSS），并与智利国家地震中心（Centro Sismológico Nacional, CSN）及智利大学开展紧密合作。
