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M7.7 earthquake, Japan, 1938-05-23

MagnitudeM7.7mw

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Depth15 km

Time (UTC)1938-05-23 07:18

Rank in 19385 / 149among M6+

Rank since 1900245 / 14,458

Energy vs an M6×355approx.

69 km ESE of Kitaibaraki, Japan · 36.53, 141.46

M6.5+ within 300 km (largest first)

2011 M9.1M9.1

1923 M8.0M8.0

1953 M7.9M7.9

2011 M7.9M7.9

1923 M7.8M7.8

1938 M7.8M7.8

1938 M7.7M7.7

1978 M7.7M7.7

1938 M7.7M7.7

1964 M7.6M7.6

1915 M7.6M7.6

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.2 1937-12-10	1937-12-10 13:28	15 km	106 km ESE of Hasaki, Japan
M6.3 1937-12-06	1937-12-06 04:34	15 km	120 km E of Hasaki, Japan
M6.3 1937-10-17	1937-10-17 04:47	25 km	44 km ESE of Hasaki, Japan
M6.6 1937-07-26	1937-07-26 19:56	35 km	42 km E of Onagawa Ch?, Japan
M6.1 1937-02-27	1937-02-27 01:15	15 km	107 km ESE of Takahagi, Japan
M6.4 1937-01-07	1937-01-07 06:12	35 km	near the east coast of Honshu, Japan
M7.2 1936-11-02	1936-11-02 20:45	35 km	83 km E of Ishinomaki, Japan
M6.8 1935-07-19	1935-07-19 00:49	10 km	80 km ESE of Kitaibaraki, Japan
M6.6 1935-03-30	1935-03-30 21:19	35 km	84 km ESE of Namie, Japan
M6.0 1934-04-06	1934-04-06 19:09	35 km	23 km ENE of Namie, 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.