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<p>The ocean bottom seismograph (OBS) is a powerful device deployed on the seafloor for acquiring marine seismic data, capable of detecting the multi-scale Earth’s interiors from submarine sediments to the mantle. Due to the frequent use of free-fall deployment, it is challenging to accurately track its precise position. Additionally, the internal crystal oscillator clock of the OBS has limited accuracy, resulting in clock drift for long-term work on the seabed. To improve the reliability of OBS detections, it is crucial to calculate the precise OBS location and time correction. Focusing on accurately determining OBS position and timing, this study developed a positioning method that integrates time correction based on the Markov Chain Monte Carlo (MCMC) algorithm, utilizing travel times of direct water waves triggered by two-dimensional (2-D) shot lines or three-dimensional (3-D) airgun arrays. This newly developed method can simultaneously estimate accurate OBS location and time correction, incorporating bathymetric data into the inversion procedures to improve sampling efficiency and enhance the reliability of the final results. Synthetic tests with appropriate noise levels are performed independently to evaluate the feasibility and reliability of our method, indicating that it is robust enough to determine OBS location and time correction precisely. Finally, we use travel-time data recorded at three OBSs deployed in the Southwest Indian Ridge to relocate locations and calculate time corrections. The results exhibit high consistency when using 2-D and 3-D shot data, indicating that high-resolution bathymetric data plays a fingerprint role in inversion to evaluate precise OBS location and time correction.</p>

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Ocean bottom seismograph relocation and time correction using the MCMC algorithm

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Hao Hu,
  • Xiongwei Niu,
  • Wei Wang,
  • Wencai Xu,
  • Aiguo Ruan,
  • Wenfei Gong,
  • Xiaodong Wei,
  • Mingju Xu,
  • Tao Li

摘要

The ocean bottom seismograph (OBS) is a powerful device deployed on the seafloor for acquiring marine seismic data, capable of detecting the multi-scale Earth’s interiors from submarine sediments to the mantle. Due to the frequent use of free-fall deployment, it is challenging to accurately track its precise position. Additionally, the internal crystal oscillator clock of the OBS has limited accuracy, resulting in clock drift for long-term work on the seabed. To improve the reliability of OBS detections, it is crucial to calculate the precise OBS location and time correction. Focusing on accurately determining OBS position and timing, this study developed a positioning method that integrates time correction based on the Markov Chain Monte Carlo (MCMC) algorithm, utilizing travel times of direct water waves triggered by two-dimensional (2-D) shot lines or three-dimensional (3-D) airgun arrays. This newly developed method can simultaneously estimate accurate OBS location and time correction, incorporating bathymetric data into the inversion procedures to improve sampling efficiency and enhance the reliability of the final results. Synthetic tests with appropriate noise levels are performed independently to evaluate the feasibility and reliability of our method, indicating that it is robust enough to determine OBS location and time correction precisely. Finally, we use travel-time data recorded at three OBSs deployed in the Southwest Indian Ridge to relocate locations and calculate time corrections. The results exhibit high consistency when using 2-D and 3-D shot data, indicating that high-resolution bathymetric data plays a fingerprint role in inversion to evaluate precise OBS location and time correction.