東北とうほく地方ちほう太平たいへいようおき地震じしんだったら
tōhokuchihō taiheiyōoki jishindattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 東北地方太平洋沖地震

1. If/When the Tōhoku-Pacific Ocean Earthquake happened; Had the Tōhoku-Pacific Ocean Earthquake occurred

Tara Conditional