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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