図4．2021年1月1日以降の3月20日，5月1日地震の震源域での地震累積曲線．2月13日M7.3地震発生時に特段の変化は認められない．しかし，5月1日の震源域では3月20日M6.9地震による一時的な活発化が認められる．その後通常の活動戻ったようにみえるが，42日後にM6.8地震が発生した．
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