東北 とうほく関東 かんとう だい震災 しんさいだったら
tōhokukantōdaishinsaidattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 東北関東大震災

1. If/when the Great East Japan Earthquake happened; Had the Great East Japan Earthquake occurred

Tara Conditional