Fig. 2

a Time series of slant range change at pixels of most deformed area. These pixels are indicated as black circles in b and c. The time plots were obtained from two independent orbits of ALOS-2 satellite (Narita and Murakami 2018); path 126, an orbit of ascending and right-looking (red circles) and path 20, an orbit of descending and right-looking (blue circles), respectively. Stack of interferograms in b path 126 from 2014/10/03 to 2017/07/21 and in c path 20 from 2014/10/05 to 2017/05/28. Black and gray dots in b and c indicate vents in the 2014 eruption and 1979, 1991 and 2007 eruption, respectively