Geofísica

Prompt and accurate tsunami forecast is essentially important to reduce the fatalities of onshore residences due to tsunami, and the 2011 megathrust Tohoku-oki earthquake reinforced the importance of offshore observation for warning of near-field tsunami. Under the sponsorship of MEXT, Japanese government, NIED is now constructing S-net (Seafloor Observation Network for Earthquakes and Tsunamis along the Japan Trench) where offshore observations were insufficient at the time of the Tohoku-oki earthquake.