MOESM1 of Precursory tilt changes associated with a phreatic eruption of the Hakone volcano and the corresponding source model

Additional file 1. Comparison of synthetic apparent tilt motions calculated using four time functions. Examples of the time functions of source expansion are shown in the left panel. F1 [Eq. (2)] was used in this study with the time constant T set to 45 s. F2 is an exponential relaxation function represented by 1 − exp(−t/T) with T set as 45 s. F3 and F4 are smoothed ramp functions (0.5 × (1.0 + tanh((4.0 × t)/Tr))) with the rise time Tr set to 60 and 120 s, respectively. The right panel shows the apparent tilt motions calculated using the functions in the left panel. The NS component of tilt change observed at KZR is indicated by the orange line

MOESM2 of Precursory tilt changes associated with a phreatic eruption of the Hakone volcano and the corresponding source model

Additional file 2. The map represents surface slope gradation. The location of the best-fit model (red rectangle), the eruption center (red circle), and tilt observation stations (white triangles) are shown in the map. Yellow arrows indicate the locations of old fissures

MOESM2 of Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

Additional file 2. Temporal changes in amplitude ratios during volcanic tremor. This file shows the temporal changes in the amplitude ratios among the stations near the vents