Fig. 6

Time series of DO in the bottom water at the deep-sea station (~ 1000 m depth) off Otsuchi Bay (Fig. 1a) before and after the events of the large earthquakes (purple double lines): February 17, 2015 (Ev1, Fig. 1a), September 17, 2017 (Ev2, Fig. 1a), and July 7, 2018, off then Boso Peninsula (Ev3). Dashed and bold lines refer to the 9-day mean values before and after the large earthquakes, respectively