Water Depth Dependence of Long-Range Correlation in Nontidal Variations in Seafloor Pressure

Tomohiro Inoue, Yoshihiro Ito, Laura M. Wallace, Yutaka Yoshikawa, Daisuke Inazu, Emmanuel Soliman M. Garcia, Tomoya Muramoto, Spahr C. Webb, Kazuaki Ohta, Syuichi Suzuki, Ryota Hino

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6 Citations (Scopus)


Isolating the source of nontidal oceanographic noise in seafloor pressure data is critical for improving the use of these data for seafloor geodetic applications. Residuals between nearby bottom pressure records have typically been used to remove the nontidal components, as these are largely common-mode. To evaluate the similarities between pairs of observed bottom pressure records at a range of water depths, we calculate the standard deviations of the time series of residuals between data from all site pairs, installed in the Hikurangi subduction zone offshore New Zealand. We find that the magnitude of the standard deviation depends more on relative water depth than the distance between sites. This confirms the result of previous studies from Cascadia that nontidal components are more similar along isobaths even if the distance between sites is large. Furthermore, in order to reduce noises, the required depth difference between site pairs also varies with site depths.

Original languageEnglish
Article numbere2020GL092173
JournalGeophysical Research Letters
Issue number8
Publication statusPublished - 2021 Apr 28


  • correlation
  • nontidal variation
  • ocean bottom pressure
  • water depth dependence


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