Table 2 The ratio of the observed and the theoretical phase velocity difference
Model | Source distance range [m] | Frequency [Hz] | |||
|---|---|---|---|---|---|
10–20 | 20–30 | 30–40 | 40–50 | ||
A | 5–20 | 3.2 | 2.5 | 3.6 | 34.0 |
5–15 | – | 4.4 | 2.2 | 4.2 | |
10–20 | – | 5.1 | 4.3 | 90.8 | |
15–25 | – | 10.0 | 41.1 | 60.3 | |
B | 5–20 | 2.5 | 0.7 | 1.0 | 1.6 |
5–15 | – | 2.9 | 2.6 | 2.3 | |
10–20 | – | 1.2 | 1.0 | 1.9 | |
15–25 | – | 2.6 | 0.8 | 1.8 | |
C | 5–20 | 10.8 | 3.3 | 2.1 | 1.7 |
5–15 | – | 6.0 | 4.2 | 3.3 | |
10–20 | – | 4.5 | 1.6 | 1.3 | |
15–25 | – | 3.3 | 1.5 | 1.0 | |