2011年東北地方太平洋沖地震（M9）以降に発生した3つのスラブ内地震の直後24時間の余震分布（一般に初期の余震分布が震源断層の大きさを示唆する）．3つの地震とも沈み込んだ太平洋プレート内に発生した逆断層型地震である．逆に，M9はプレート境界型の超巨大地震で，この3つの地震の東側で30m以上の断層変位（ズレ）をともなった．
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