Table 2 Statistics of singles, mainshocks, aftershocks, and foreshocks using the nearest-neighbor distance analysis of long-term data
From: Characteristics of foreshock activity inferred from the JMA earthquake catalog
Magnitude range | Singles | Families | All | ||||||
|---|---|---|---|---|---|---|---|---|---|
Mainshocks | Aftershocks | Foreshocks | |||||||
All events: M ≥ 0 | 93,938 | 22% | 17,700 | 4% | 265,656 | 62% | 52,332 | 12% | 429,626 |
1 ≤ M < 2 | 87,014 | 24% | 9990 | 3% | 219,297 | 61% | 41,847 | 12% | 358,148 |
2 ≤ M < 3 | 6676 | 11% | 5934 | 10% | 39,884 | 65% | 8960 | 15% | 61,454 |
3 ≤ M < 4 | 245 | 3% | 1480 | 17% | 5674 | 65% | 1315 | 15% | 8714 |
4 ≤ M < 5 | 3 | 0% | 248 | 22% | 718 | 62% | 184 | 16% | 1153 |
5 ≤ M < 6 | 0 | 0% | 35 | 27% | 76 | 58% | 20 | 15% | 131 |
6 ≤ M < 7 | 0 | 0% | 9 | 41% | 7 | 32% | 6 | 27% | 22 |
7 ≤ M | 0 | 0% | 4 | 100% | 0 | 0% | 0 | 0% | 4 |