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Table 2 Specifications of S-net, ETMC, and DONET relevant to this study

From: “N”-shaped Y/X coda spectral ratio observed for in-line-type OBS networks; S-net and ETMC: interpretation based on natural vibration of pressure vessel

Type of observation system In-line In-line Node
Digging around station or buried when installed Most stations installed at water depths of < 1500 m No Dependent on site and period (Table 1)
Mounted equipment to enhance coupling with seafloor No Yes Yes
Gimbal system No Yes Yes
Used seismic sensor Velocity seismometer (15 Hz) Velocity seismometer (1 Hz) Broadband seismometer