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M6.5 earthquake, Japan, 1931-09-21

MagnitudeM6.5mw

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Depth15 km

Time (UTC)1931-09-21 02:20

Rank in 193134 / 124among M6+

Rank since 19004188 / 14,458

Energy vs an M6×6approx.

1 km WNW of Kumagaya, Japan · 36.14, 139.38

M6.5+ within 300 km (largest first)

1923 M8.0M8.0

2011 M7.9M7.9

1923 M7.8M7.8

1938 M7.8M7.8

1938 M7.7M7.7

1964 M7.6M7.6

1938 M7.6M7.6

2024 M7.5M7.5

1906 M7.4M7.4

2022 M7.3M7.3

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1931-09-16	1931-09-16 12:43	15 km	12 km NW of Hadano, Japan
M6.2 1931-09-08	1931-09-08 19:08	15 km	145 km ENE of Hasaki, Japan
M6.5 1931-06-23	1931-06-23 06:14	25 km	97 km NE of Hasaki, Japan
M6.1 1931-06-17	1931-06-17 12:09	35 km	5 km S of Kokubunji, Japan
M6.9 1930-11-25	1930-11-25 19:02	15 km	5 km WSW of Atami, Japan
M6.1 1930-05-31	1930-05-31 17:58	35 km	34 km E of ?arai, Japan
M6.2 1930-05-01	1930-05-01 00:57	35 km	31 km SE of Hasaki, Japan
M6.2 1929-07-26	1929-07-26 22:48	60 km	2 km SSE of Zama, Japan
M6.1 1928-05-19	1928-05-19 09:32	35 km	66 km E of ?arai, Japan
M6.2 1927-08-20	1927-08-20 21:37	20 km	154 km ESE of ?hara, 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.