Open Access
Table 1
The number of wave events in each period range used for the analysis.
| Period range | No. of waves | Mean occurrence rate |
|---|---|---|
| 1–5 min | 2131 | 12.9% |
| 5–10 min | 1732 | 27.5% |
| 10–15 min | 1386 | 35.2% |
| 15–20 min | 844 | 30.2% |
| 20–27 min | 1102 | 42.6% |
| All periods | 7195 | 148.5% |
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