Fig. 7
From: Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption
Plots showing temporal variations of SO2 and H2S concentrations (a1, b1, c1 and d1) and flight altitude (a2, b2, c2 and d2) during the MultiGAS flights in Figs. 3 and 4; (series a) on November 20, 2014 (green line in Fig. 3). (series b) and (series c) for the first and the second flights on November 21, 2014 (orange line in Fig. 3). (series d) on June 2, 2015 (orange line in Fig. 4). For the second MultiGAS flight, temporal variations of CO2, H2O, H2 concentrations and temperature are plotted, respectively, in c3–c6