In this decade, the coseismic rupture process of the 2011 Tohoku earthquake and its preseismic and postseismic processes have been investigated in detail (e.

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While disastrous tsunamis are mostly generated by large earthquakes, some tsunamis are excited by pressure disturbances at sea surfaces caused by meteorological phenomena such as storms and moving convective systems (e.g., Churchill et al., 1995;Monserrat et al., 2006). Such tsunamis are known as meteorological tsunamis or meteotsunamis. The basic generation mechanism of a meteorological tsunami was theoretically investigated in two-dimensional (2-D) space with long-wave approximations (e.g.,

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In response to the 2011 Tohoku-Oki earthquake, a dense OBP network consisting of 150 observatories, called the Seafloor Observation Network for Earthquakes and Tsunamis along the Japan Trench (S-net), was constructed (Figure 1a; Aoi et al., 2020). Recent studies have revealed that S-net is capable of observing tsunamis at much higher spatial resolutions than was previously possible. S-net has started to be widely utilized for monitoring ocean waves related to earthquakes. One of the largest tsunamis so far recorded by S-net was that associated with the Mw 7.0 Off-Fukushima earthquake on