Figure 2

Time series variations of geodetic deflation rate of the magma chamber and eruption cloud height. (a) Correlation between geodetic deflation rate of the magma chamber estimated from tiltmeter data (red; Ueda et al. [2013]) and eruption cloud echo height estimated from weather radar data (blue; Shimbori et al. [2013]) in the 2011 Shinmoe-dake eruptions during the period from January 26 to February 2. Eruptive activities of sub-Plinian eruptions (P1, P2, and P3), Vulcanian explosions (V and V'), small-scale column-forming eruptions (SC), and lava extrusion are shown on the upper side of the figure. The echo in the morning of January 28 is deduced as rain clouds (Shimbori et al. [2013]). (b) Enlarged view during the period from 12:00 on January 26 to 24:00 on January 27.