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Table 1 Results of plume measurements at Mt. Ontake

From: Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption

Date SO2 flux (t/d) Traverse method SO2/H2S molar ratio Flight method H2S flux (t/d) S flux (t/d)
October 09, 2014 450a car 0.31 Helicopterc 770 950
November 20, 2014 140 UAV 0.093 UAV 800 820
November 21, 2014 130 UAV 0.097 UAV 710 730
March 26, 2015   car 0.04 Cessnad   
June 02, 2015 <7b UAV 0.034 UAV <110 <110
  1. a400–500 t/d measured by JMA on October 9, 2014 (JMA 2014b)
  2. bThe value is the maximum estimate. See text for details
  3. cMeasured by RK by a manned helicopter
  4. dMeasured by AT by a manned Cessna aircraft