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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