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M6.8 earthquake, Japan, 1968-09-21

MagnitudeM6.8mw

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Depth55 km

Time (UTC)1968-09-21 13:06

Rank in 196826 / 159among M6+

Rank since 19002187 / 14,458

Energy vs an M6×17approx.

12 km SSW of Urakawa, Japan · 42.06, 142.71

M6.5+ within 300 km (largest first)

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

1973 M7.7M7.7

1993 M7.6M7.6

2025 M7.6M7.6

1901 M7.5M7.5

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.1 1968-09-15	1968-09-15 10:50	27 km	142 km SSE of Honchō, Japan
M6.0 1968-08-25	1968-08-25 09:07	25 km	130 km E of Noda, Japan
M6.1 1968-07-23	1968-07-23 23:02	26 km	140 km ENE of Noda, Japan
M6.0 1968-07-12	1968-07-12 00:44	22 km	109 km E of Yamada, Japan
M6.1 1968-06-22	1968-06-22 01:12	21 km	166 km E of Noda, Japan
M6.3 1968-06-17	1968-06-17 11:53	40 km	121 km SSE of Honchō, Japan
M6.1 1968-06-13	1968-06-13 21:10	34 km	91 km E of Yamada, Japan
M7.0 1968-06-12	1968-06-12 13:41	32 km	87 km E of Yamada, Japan
M6.1 1968-05-25	1968-05-25 11:52	36 km	121 km E of Noda, Japan
M6.6 1968-05-24	1968-05-24 14:06	27 km	141 km ENE of Kuji, 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.