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M6.8 earthquake, Japan, 1984-09-18

MagnitudeM6.8mw

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Depth48 km

Time (UTC)1984-09-18 17:02

Rank in 198420 / 133among M6+

Rank since 19002324 / 14,458

Energy vs an M6×16approx.

166 km SE of Katsuura, Japan · 34.01, 141.50

M6.5+ within 300 km (largest first)

1923 M8.0M8.0

1953 M7.9M7.9

2011 M7.9M7.9

1923 M7.8M7.8

1938 M7.7M7.7

1972 M7.3M7.3

1906 M7.3M7.3

1923 M7.2M7.2

1905 M7.2M7.2

1961 M7.2M7.2

1972 M7.2M7.2

1924 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1983-10-03	1983-10-03 13:33	12 km	96 km SSE of Shimoda, Japan
M6.3 1982-12-28	1982-12-28 06:37	22 km	104 km SSE of Shimoda, Japan
M6.2 1982-07-23	1982-07-23 17:54	31 km	88 km ENE of Hasaki, Japan
M7.1 1982-07-23	1982-07-23 14:23	37 km	93 km ENE of Hasaki, Japan
M6.5 1982-02-20	1982-02-20 19:18	18 km	184 km SSE of Katsuura, Japan
M6.0 1980-09-24	1980-09-24 17:54	73 km	7 km NNE of Kisarazu, Japan
M6.2 1980-06-29	1980-06-29 07:20	15 km	19 km SSE of It?, Japan
M6.6 1978-01-14	1978-01-14 03:24	14 km	23 km SE of It?, Japan
M6.0 1977-02-18	1977-02-18 20:51	42 km	229 km SSE of Tateyama, Japan
M6.1 1974-09-27	1974-09-27 03:10	46 km	186 km SSE of Katsuura, 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.