Additional file 1 of Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
Creators: name: Ganefianto, Gugi
name: Nakahara, Hisashi
name: Nishimura, Takeshi
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Neuroscience
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1: Figure S1. Distribution of teleseismic sources used in this study. Figure S2. Peak amplitude ratio at the JMA seismometers averaged for individual volcanoes at all frequency bands evaluated in this study. The colour scale is the same as the one used in Nishimura (2012). Figure S3. The distribution of peak amplitude ratio calculated for the JMA volcanic seismometer network averaged for each volcano at the 0.5–1 Hz frequency band across different regions: (a) Tohoku (b) Hokkaido (c) Kyushu (d) Kanto-Chubu. The colour scheme used mimics the one from Nishimura (2012). Figure S4. The distribution of peak amplitude ratio calculated for the JMA volcanic seismometer network averaged for each volcano at the 1–2 Hz frequency band across different regions: (a) Tohoku (b) Hokkaido (c) Kyushu (d) Kanto-Chubu. The colour scheme used mimics the one from Nishimura (2012). Figure S5. The distribution of peak amplitude ratio calculated for the JMA volcanic seismometer network averaged for each volcano at the 4–8 Hz frequency band across different regions: (a) Tohoku (b) Hokkaido (c) Kyushu (d) Kanto-Chubu. The colour scheme used mimics the one from Nishimura (2012). Figure S6. Station peak amplitude ratios plotted against their estimated distance to the volcanic centre according to the 4th edition National Catalogue of the Active Volcanoes in Japan (Japan Meteorological Agency, 2013) at all four frequency bands. JMA stations can be differentiated into ground surface (red) and borehole (blue) stations. Stations with green symbols are not classified on the JMA website. Also shown are peak ratios at Hi-net borehole stations that are within 20 km of volcanoes (Nishimura, 2012). Overall, the JMA ground surface stations show larger ratios than their borehole counterpart. For the JMA borehole stations especially at the lower frequencies, we see an ostensible decay in peak ratio with distance. This pattern is continued by the Hi-net stations. Figure S7. Peak amplitude ratios according to the volcano where the stations are positioned. Stations are further differentiated into ground surface (red) and borehole (blue) stations. Stations with green symbols are not classified on the JMA website. Results are presented for the four frequency bands used in this study. From left to right, volcanoes are sorted from South to North. Grey denotes the 95% confidence interval for the peak ratio of quaternary volcano group cited in Nishimura (2012). For the 4–8 Hz band, there are no data for the Asosan and Yakedake volcanoes. Figure S8. Probability density functions of transverse peak delay times at four frequency bands: 0.5–1, 1–2, 2–4, 4–8 Hz. Yellow histograms show the distributions of transverse peak delay times when all JMA stations are considered. Red and blue histograms separate the transverse peak delay time distributions into JMA ground surface and borehole stations, respectively. The grey bands indicate the transverse peak delay time mean plus-and-minus one standard deviation for all Hi-net data according to Table 1 of Nishimura (2012).