The list shows notable earthquakes in December 2013 in Japan. Total 170 earthquakes which were bigger than "earthquake intensity 1" were observed in December. No tsunami and no casualty were reported. Japan Meteorological Agency says number of afterquake of "2011.3.11 Tohoku-Pacific Ocean Earthquake" is gradually decreasing.
| No. | Date | Earthquake center | Earthquake center | Magnitude | Earthquake intensity | Strongest quake observed at | |
| 1 | Dec | 3 | 茨城県北部 | Ibaraki | 4.1 | 3 | Ibaraki |
| 2 | Dec | 3 | 千葉県東方沖 | in the waters off Chiba | 4.5 | 4 | Chiba |
| 3 | Dec | 3 | 茨城県沖 | in the waters off Ibaraki | 5.5 | 3 | Ibaraki |
| 4 | Dec | 9 | 択捉島南東沖 | in the waters off Etorofu island | 6.4 | 2 | Hokkaido |
| 5 | Dec | 14 | 千葉県東方沖 | in the waters off Chiba | 5.5 | 4 | Ibaraki |
| 6 | Dec | 16 | 釧路地方中南部 | Kushiro, Hokkaido | 4.6 | 3 | Hokkaido |
| 7 | Dec | 16 | 茨城県北部 | Ibaraki | 4.2 | 3 | Ibaraki |
| 8 | Dec | 18 | マリアナ諸島 | Mariana Islands | 6.6 | ||
| 9 | Dec | 21 | 茨城県南部 | Ibaraki | 5.2 | 4 | Tochigi |
| 10 | Dec | 21 | 千葉県東方沖 | in the waters off Chiba | 5.5 | 4 | Ibaraki |
| 11 | Dec | 27 | 岩手県沖 | in the waters off Iwate | 5 | 3 | Aomori |
| 12 | Dec | 31 | 茨城県北部 | Ibaraki | 5.4 | 5L | Ibaraki |
Size of circle indicates magnitude. Color of circle indicates depth of the hypocenter. Source is Japan Meteorological Agency.
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