Fig. 4
From: Temporal changes in inflation sources during the 2015 unrest and eruption of Hakone volcano, Japan
a Volume changes of the three sources before and after the 2015 volcanic unrest at Hakone volcano (from March 2015 to June 2016). The blue, orange, and green symbols are the total volume changes of the deep spherical inflation, shallow open crack, and sill sources, respectively. Gray plots mean that an estimated error is large (RMS error ≥ 3.0 × 10−3). b Daily number of earthquakes at Hakone volcano during the same period as above