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M8.3 earthquake, Japan, 1946-12-20

MagnitudeM8.3mw

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Depth15 km

Time (UTC)1946-12-20 19:19

Rank in 19462 / 94among M6+

Rank since 190025 / 14,458

Energy vs an M6×2,818approx.

68 km S of Shing?, Japan · 33.12, 135.91

M6.5+ within 300 km (largest first)

1946 M8.3M8.3

1944 M8.1M8.1

1948 M7.4M7.4

1906 M7.4M7.4

2004 M7.4M7.4

1910 M7.2M7.2

1984 M7.2M7.2

2004 M7.2M7.2

2009 M7.1M7.1

1915 M7.0M7.0

1928 M7.0M7.0

1927 M7.0M7.0

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.5 1945-08-28	1945-08-28 19:21	15 km	88 km S of ?yama, Japan
M6.3 1945-01-16	1945-01-16 13:36	15 km	7 km SSE of Ishiki, Japan
M6.6 1945-01-12	1945-01-12 18:38	10 km	18 km SW of Tahara, Japan
M6.4 1944-12-12	1944-12-12 10:25	15 km	59 km SSE of Toba, Japan
M8.1 1944-12-07	1944-12-07 04:35	15 km	1944 Toankai Earthquake
M6.1 1940-11-18	1940-11-18 12:47	50 km	18 km NNE of Tanabe, Japan
M6.5 1938-01-11	1938-01-11 15:12	25 km	17 km WSW of Tanabe, Japan
M6.0 1936-02-21	1936-02-21 01:07	10 km	6 km NNW of Gose, Japan
M6.9 1929-06-02	1929-06-02 21:38	350 km	65 km SSE of Toba, Japan
M7.0 1928-03-29	1928-03-29 05:06	405 km	289 km SE of Shing?, 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.