MOESM1 of Why do aftershocks occur? Relationship between mainshock rupture and aftershock sequence based on highly resolved hypocenter and focal mechanism distributions

Additional file 1. Procedure of event selection for principal component analysis (PCA). This file describes our procedure for event selection

MOESM2 of Why do aftershocks occur? Relationship between mainshock rupture and aftershock sequence based on highly resolved hypocenter and focal mechanism distributions

Additional file 2. Validation of the thickness of aftershock distribution by using the observed differential arrival times. This file shows the waveform records to validate the thickness of aftershock distribution

MOESM1 of Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption

Additional file 1. Photographs near the vents (Owakudani) taken using a time-lapse camera before and during the rapid tilt change

MOESM2 of Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption

Additional file 2. Calibration test for the microphone at the OWD station

MOESM3 of Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption

Additional file 3. Shift in the peaks and node of the seismic-infrasonic correlation resulting from background seismic oscillation

MOESM4 of Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption

Additional file 4. Strain changes using the open crack model estimated by InSAR data

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

MOESM1 of Resistivity characterisation of Hakone volcano, Central Japan, by three-dimensional magnetotelluric inversion

Additional file 1. Epicentral distributions of swarm activities in 2001, 2009, 2011, 2013 and 2015; and vertical cross sections of the obtained resistivity structure overlain by the hypocentres of such swarm epochs