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Table 1 Maximum temperature of fumarole steam at Owakudani from the historical literature (after Mannen 2009)

From: Chronology of the 2015 eruption of Hakone volcano, Japan: geological background, mechanism of volcanic unrest and disaster mitigation measures during the crisis

Year Observer Max. temperature (°C)
1872 J. P. I. Vidal 103
1917 F. Omori 141
1920 T. Kato 106
1921 T. Kato 97
1925 S. Tokuda 98
1932–1933 M. Sugiyama and O. Okada 102
1951–1953 I. Iwasaki 86
1966–1967 K. Yuhara 138 (steam well?)