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

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