Earth, Planets and Space

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	450^a	car	0.31	Helicopter^c	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	Cessna^d
June 02, 2015	<7^b	UAV	0.034	UAV	<110	<110

^a400–500 t/d measured by JMA on October 9, 2014 (JMA 2014b)
^bThe value is the maximum estimate. See text for details
^cMeasured by RK by a manned helicopter
^dMeasured by AT by a manned Cessna aircraft

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