The spatial orientation stability of seismometers deployed at four S-net seafloor observatories was investigated using cross-spectral analysis of seismic records from strong earthquakes. Data from three events (Gulf of Alaska, 23 Jan 2018; Chignik, 29 Jul 2021; Noto Peninsula, 01 Jan 2024; all Mw > 7.5), evenly spaced throughout the 2018–2024 observation window, demonstrate that the instrument orientations remained invariant to within an estimated error of 1 degree over the six-year period.
93.85.Rt Seismic methods
$^1$Lomonosov Moscow State University, Faculty of Physics, Department of the Physics of Sea and Inland Wather\
$^2$Institute of Marine Geology and Geophysics Far Eastern Branch Russian Academy of Science
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