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M6.6 earthquake, Japan, 2025-12-08

MagnitudeM6.6mww

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Depth19 km

Time (UTC)2025-12-08 21:52

Rank in 202538 / 145among M6+

Rank since 19003812 / 14,458

Energy vs an M6×8approx.

129 km S of Honchō, Japan · 40.98, 143.15

M5.5+ within 100 km in the next 30 days

Event	Time (UTC)	Depth	Place
M5.6 2025-12-08	2025-12-08 23:59	48 km	109 km NE of Kuji, Japan
M5.7 2025-12-10	2025-12-10 14:52	33 km	108 km ENE of Hachinohe, Japan
M6.7 2025-12-12	2025-12-12 02:44	19 km	117 km NE of Kuji, Japan
M5.6 2025-12-25	2025-12-25 16:17	54 km	103 km E of Yokohama, Japan
M6.0 2025-12-31	2025-12-31 14:26	27 km	96 km E of Noda, Japan

M6.5+ within 300 km (largest first)

1933 M8.4M8.4

1968 M8.2M8.2

2003 M8.2M8.2

1952 M8.1M8.1

1960 M8.0M8.0

1931 M7.9M7.9

1968 M7.9M7.9

1994 M7.8M7.8

1919 M7.7M7.7

1905 M7.7M7.7

1915 M7.6M7.6

1993 M7.6M7.6

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 2025-12-08	2025-12-08 18:56	23 km	127 km S of Honchō, Japan
M7.6 2025-12-08	2025-12-08 14:15	41 km	2025 Aomori Prefecture, Japan Earthquake
M6.0 2025-11-10	2025-11-10 07:23	11 km	129 km E of Yamada, Japan
M6.4 2025-11-09	2025-11-09 08:54	10 km	117 km E of Yamada, Japan
M6.8 2025-11-09	2025-11-09 08:03	18 km	122 km E of Yamada, Japan
M6.0 2025-05-31	2025-05-31 08:37	21 km	78 km S of Kushiro, Japan
M6.2 2023-06-11	2023-06-11 09:54	121 km	20 km WSW of Biratori, Japan
M6.0 2023-03-28	2023-03-28 09:18	37 km	Hokkaido, Japan region
M6.0 2023-02-25	2023-02-25 13:27	55 km	Hokkaido, Japan region
M6.3 2020-12-20	2020-12-20 17:23	35 km	100 km ENE of Hachinohe, Japan

Energy ratio uses the rule that one magnitude unit is about 32 times the energy. Magnitudes and locations are USGS values and can differ from national agencies. Older records are less complete and less precise.