“…The large amounts of drift pumice filled port areas and hindered vessel navigation, which led to significant economic losses (Asami & Takahashi, 2023; Maeno et al, 2022; Yoshida, Tamura, Sato, Hanyu, et al, 2022; Yoshida, Maruya, & Kuwatani, 2022). The drift pumice is geochemically homogeneous (Yoshida, Tamura, Sato, Hanyu, et al, 2022) and has similar compositions to that generated during past eruptions in 1904, 1914, 1986, and 1992 (Kato, 1988; Nakano & Kawanabe, 1992; Sun et al, 1998; Tsuya, 1937; Yoshida et al, 1987), although the color and texture of the pumice are variable (Yoshida, Tamura, Sato, Hanyu, et al, 2022). A notable characteristic of the pumice generated by FOB is the minor but common occurrence of black‐colored pumice, which consists mainly of transparent brown glass with magnetite nanocrystals (i.e., nanolites) (Yoshida, Tamura, Sato, Hanyu, et al, 2022).…”