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  • Distributed Fiber Optic Sensing (DFOS) Measurements of the 2025 M8.8 Kamchatka Earthquake in Brabant, the Netherlands

    Description:
    This dataset is part of a Distributed Fiber Optic Strain Sensing (DFOS) study along a dark fiber for monitoring purposes conducted on an optical fiber link between Boxmeer and Deurne in the Netherlands. The work investigates the application of DFOS using existing dark fiber infrastructure from telecommunication companies to capture strain variations along tens of kilometers with high spatial and temporal resolution. The experiment covered the time period from 2025-06-25 08:19:32 UTC to 2025-08-11 11:56:03 UTC. This data set contains the recordings covering the arrival of seismic waves from the 2025 M8.8 Kamchatka earthquake between 2025-07-29 23:30:01 UTC to 2025-07-30 01:15:46 UTC. Recordings with the QuantX-system contain the following settings: gauge length of 20 m, channel spacing of 2 m, and a sampling rate of 250 Hz. The dark fiber has a length of nearly 36 km, leading to a total of 18,100 channels in each file. File naming follows the start timestamp in BTS. The 26 geo-referenced channel locations from tap tests and/or locatable noise sources are contained in this data set as well.
    Keyword:
    Distributed Fiber Optic Sensing (DFOS), Seismic Monitoring, Kamchatka, Earthquake, Ground Motion, Netherlands, Distributed Acoustic Sensing (DAS), and Distributed Dynamic Strain Sensing (DDSS)
    Subject:
    Earthquake and Seismology
    Publisher:
    Language:
    English
    Date Uploaded:
    2025-09-12
    Date Modified:
    2025-09-29
    License:
    Creative Commons CC0 1.0 Universal
    Resource Type:
    Dataset

  • Earthquake Catalog and Continuous Waveforms from a Two-Week Distributed Acoustic Sensing experiment on Kefalonia Island, Greece.

    Description:
    The dataset contains continuous waveforms from a two-week Distributed Acoustic Sensing (DAS) experiment and the resulting catalog(s). The DAS data were recorded along a ~15 km-long dark telecom optical fiber connecting the villages of Antipata (Kefalonia) and Stavros (Ithaki), Greece. Continuous waveforms cover the period from 1 August 2024, 23:00 UTC to 15 August 2024, 23:00 UTC, with a short data gap between 09:14 and 09:48 UTC on 6 August 2024 due to an archiving interruption. File names correspond to UTC time + 1 hour, following the default system convention. Data acquisition was performed using a QuantX OptaSense interrogator with a ping rate of 5000 Hz, and subsequently decimated by a factor of 20 to a final sampling rate of 250 Hz. The system configuration used a gauge length of 10 m and a channel spacing of 2.04 m, resulting in a total of 7,750 channels. Waveform data are stored in 30-second segments and in the default instrument unit (optical phase shift). Additionally, we include the channel list after removing loops. and The DOWNLOAD ALL button provides a bash script that downloads all files in this dataset using a sequence of 'curl' commands. You may edit the script to suit your needs—for example, by removing or commenting out 'curl' lines corresponding to files or time intervals you do not wish to download.
    Keyword:
    Distributed Acoustic Sensing (DAS), Distributed Fiber Optic Sensing (DFOS), Seismicity, and Earthquake Catalog
    Subject:
    Earthquake and Seismology
    Publisher:
    Language:
    English
    Date Uploaded:
    2025-12-04
    Date Modified:
    2025-12-18
    License:
    Creative Commons CC0 1.0 Universal
    Resource Type:
    Dataset