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Table 3 Detailed statistics of five categories

From: Difference of horizontal-to-vertical spectral ratios of observed earthquakes and microtremors and its application to S-wave velocity inversion based on the diffuse field concept

 

Category 1

Category 2

Category 3

Category 4

Category 5

Peak freq. (Hz)

0.2–1.0

1.0–2.0

2.0–5.0

5.0–10.0

10.0–20.0

Numbers

15

17

21

20

14

Δ

0.06

0.03

0.013

0.006

0.003