noun
giant tsunami; large tsunami
Refers to a tsunami of exceptionally large scale, often defined by the JMA as over 3 meters in height. The term 'giant tidal wave' is an older English equivalent but less precise.
東日本大震災では大津波が沿岸を襲った。
A giant tsunami struck the coast during the Great East Japan Earthquake.
気象庁は大津波警報を発表した。
The Japan Meteorological Agency issued a major tsunami warning.