2025 Volume 81 Issue 17 Article ID: 25-17054
Two pressure gauges have been installed at the seafloor in the the Nankai Trough in 2024. The pressure gauges have been connected to the DONET seafloor network and started for long-term observation. One of the challenges in the long-term observation of pressure gauges is sensor drift, i.e., the phenomenon in which the output value deviates from the calibrated value over time. In this study, we analyzed the in-situ data to evaluate the long-term stability of the pressure gauges. As a result, the sensor drift of the pressure gauges can be approximated by the combination of an exponential function and a linear function, and was estimated to be −0.0066 cm and +0.0236 cm per day. The pressure gauges were previously pressurized at 20 MPa for 20 days in the laboratory experiment. Although the sensor drift in the laboratory experiment was overall overestimated, the directions of sensor drift were consistent, suggesting that the laboratory experiment is effective for predicting sensor drift.
