@article {sasagawa_drift_2023,
	title = {Drift Corrected Seafloor Pressure Observations of Vertical Deformation at Axial Seamount 2018{\textendash}2021},
	journal = {Earth and Space Science},
	volume = {10},
	number = {2},
	year = {2023},
	note = {_eprint: https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2022EA002434},
	pages = {e2022EA002434},
	abstract = {Axial Seamount is a seafloor volcano with frequent eruptions and periodic cycles of inflation and deflation. Seafloor pressure gauges monitor vertical deformation with time, but inherent instrumental drift complicates and biases geodetic interpretation. A drift corrected pressure recorder was deployed on Axial Seamount on 6 July 2018, at coordinates 45{\textdegree} 57.29' North latitude, -130{\textdegree} 0.56' East longitude, depth 1,535 m. This system includes two independent quartz-resonant pressure gauges, which nearly continuously observe the seafloor pressure. At regular intervals, the gauges are calibrated in situ with a modified deadweight tester at a pressure within 98\% of the nominal seafloor pressure. Using the calibration data, the drift of each gauge has been modeled as a simple linear plus decaying exponential function of time. The two estimated linear sensor drift rates are 0.45 {\textpm} 0.12 and 0.36 {\textpm} 0.08 kPa/year; the modeled sensor drift represents a significant error if uncorrected. The standard deviations of the drift model residuals are of order 0.06 kPa or 6 mm depth equivalent. Once calibrated, the difference between the two seafloor pressure timeseries exhibits a RMS deviation of {\textpm}6 mm at the 90\% confidence limit and a linear trend less than 1 mm/year. A time series from July 2018 to December 2021 tracks the inflation of Axial Seamount with differing inflation rates over different time intervals.},
	keywords = {instruments and technique, ocean observatories and experiments, standards and absolute measurements, submarine tectonics and volcanism, volcano monitoring},
	issn = {2333-5084},
	doi = {10.1029/2022EA002434},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1029/2022EA002434},
	author = {Sasagawa, Glenn S. and Zumberge, Mark A. and Cook, Matthew J.}
}
