The 1939 Oga earthquake () struck Akita Prefecture, Japan on May 1, 1939. This event was a doublet earthquake, in which the mainshock occurred at 14:58 (JST), 6.8 ( 7.0), and an aftershock at 15:00 (JST), 6.7 ( 6.5).今村明恒、男鹿地震考 地震 第1輯 1939年 11巻 8号 p.372-384, The earthquake left 27 people dead and 52 people injured, and 479 homes were destroyed.
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