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Table 1 Mean and standard deviation of peak amplitude ratios and transverse peak delay times

From: Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves

Frequency (Hz) Peak ratio Transverse peak delay time (s) N
All JMA stations
0.5–1 0.32 ± 0.12 9.4 ± 6.3 134
1–2 0.35 ± 0.13 8.1 ± 4.2 140
2–4 0.36 ± 0.13 7.3 ± 2.8 136
4–8 0.39 ± 0.12 6.6 ± 3.0 109
JMA ground surface
0.5–1 0.34 ± 0.12 8.8 ± 6.2 77
1–2 0.40 ± 0.12 8.3 ± 4.7 82
2–4 0.42 ± 0.11 7.7 ± 3.1 79
4–8 0.43 ± 0.12 6.9 ± 2.7 58
JMA borehole
0.5–1 0.30 ± 0.11 10.4 ± 6.5 53
1–2 0.27 ± 0.09 8.0 ± 3.3 53
2–4 0.26 ± 0.09 6.7 ± 2.3 53
4–8 0.34 ± 0.10 6.3 ± 3.3 49
Hi-net all data
0.5–1 0.14 ± 0.11 10.7 ± 6.7 635
1–2 0.14 ± 0.10 8.6 ± 5.2 725
2–4 0.16 ± 0.11 7.0 ± 4.7 712
4–8 0.20 ± 0.14 6.5 ± 4.6 574
  1. N is the number of stations available. Some stations are unclassified on the JMA website. Hi-net numbers are from Table 1 of Nishimura (2012)
  2. We divide the data set into three categories (all JMA, ground surface, and borehole stations), as well as into different frequency bands