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Advances in seismic observations in the oceans with seismometers, hydrophones, and pressure gauges have provided opportunities to study seismicity, subsurface structures, earthquake and tsunami generation, and wave phenomena offshore. Permanent (cabled) observatories, and deployments of local- to regional-scale temporary arrays or fiber optic technologies promote analyses over unprecedented temporal and spatial scales, and are continuously expanding coverage in the oceans. Such developments in ocean seismology have also encouraged the community to create novel data processing and analysis techniques. The purpose of this session is to share recent advances in marine seismology, such as seismicity, seismic velocity structure from active and passive approaches, progress in developing new instruments and techniques for offshore seismic datasets, interactions between the solid earth and oceans, and new regional/global-scale experiments. We look forward to contributions from, but not limited to, the localization of submarine earthquakes and volcanoes and their relevant tsunamis, observation of the seafloor strong motion, characterization of ambient noise and interpretation of its sources, and propagation processes of various waves in the atmosphere, ocean, and solid Earth recorded by ocean instruments. This session welcomes offshore observations or analyses related to recent major earthquakes offshore, e.g., the Noto, Hyuga-nada in Japan, the Hualien in Taiwan, the Offshore Cape Mendocino in California, the Sand Point in Alaska, and the Kamchatka Peninsula. We recommend presentations by early-career researchers and students who would like to try presenting in an international session.