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Seafloor pressure is commonly used to monitor vertical deformation in active tectonic or volcanic zones on the ocean floor. Current pressure gauges offer an instrumental resolution that is sufficient for most applications; however, their final accuracy is limited due to the sensor drift which degrades our ability to detect small and/or slow motion such as transient deformation, magmatic inflation or interseismic stress build-up across faults or plates interface. This study focuses on the instrumental behavior of self-calibrating pressure recorder (A-0-A systems), we aim to characterise the long-term stability of the instruments to assess their capability for precise geodetic monitoring. We present examples from several deployments conducted in the past years in the Indian Ocean to better characterize pressure gauges drifts, unexpected pressure anomalies (“jumps”), calibration outliers and ways to mitigate their impact.

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Vertical Deformation at the Seafloor Using Pressure Gauges: Impact and Mitigation of Instrumental Drifts and Jumps

  • 章节

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • A. Laurent,
  • Y. -T. Tranchant,
  • A. Duvernay,
  • D. Dausse,
  • H. Liu,
  • J. -M. Leconte,
  • L. Testut,
  • O. de Viron,
  • V. Ballu

摘要

Seafloor pressure is commonly used to monitor vertical deformation in active tectonic or volcanic zones on the ocean floor. Current pressure gauges offer an instrumental resolution that is sufficient for most applications; however, their final accuracy is limited due to the sensor drift which degrades our ability to detect small and/or slow motion such as transient deformation, magmatic inflation or interseismic stress build-up across faults or plates interface. This study focuses on the instrumental behavior of self-calibrating pressure recorder (A-0-A systems), we aim to characterise the long-term stability of the instruments to assess their capability for precise geodetic monitoring. We present examples from several deployments conducted in the past years in the Indian Ocean to better characterize pressure gauges drifts, unexpected pressure anomalies (“jumps”), calibration outliers and ways to mitigate their impact.