Fig. 8
From: Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption
Scatter plots of H2S and SO2 concentrations showing correlations for MultiGAS flights measurements; (a) on November 20, 2014, (b, c) on November 21, 2014, and (d) on June 2, 2015. For plot (a), data between 15:20:30 and 15:22:40 were used to minimize the influence of electrical noise from the motors in the SO2 trace (Fig. 7a1). The equations and R 2 values on the right bottom of each panel are linear regression lines and coefficients of determination, respectively