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The observation data are time-stamped at the ocean bottom observatories based on GPS time information received from the landing station, and the high sampling rate data sent from each observatory are transmitted to the landing stations at both ends of the subsystem where they are converted into the original data using data conversion equipment and then transmitted through EarthLAN to the NIED DMC, JMA, and the backup center at ERI. Earth Planets Space 72 , For example, the use of the derivative waveforms of pressure can drastically reduce the effects of step noise during strong motions Kubota et al. For this purpose, we need to precisely evaluate the bottom of the seismogenic layer at depths of 10 to 20 km from hypocenters of shallow crustal earthquakes, because the largest possible crustal earthquakes are considered to be strongly related to the seismogenic layer thickness. Seafloor observations are an extension of observations to unpopulated areas, and obviously have the advantage of providing additional lead time for earthquake early warning and tsunami warning for offshore events.