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M6.5 earthquake, Japan, 1983-04-30

MagnitudeM6.5mb

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Depth30 km

Time (UTC)1983-04-30 14:03

Rank in 198344 / 136among M6+

Rank since 19004327 / 14,458

Energy vs an M6×6approx.

150 km SE of Shizunai-furukawach?, Japan · 41.47, 143.76

M6.5+ within 300 km (largest first)

1933 M8.4M8.4

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

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.7 1982-03-21	1982-03-21 02:32	44 km	19 km S of Shizunai-furukawach?, Japan
M6.0 1981-10-15	1981-10-15 01:47	47 km	71 km NNE of Miyako, Japan
M6.3 1981-01-23	1981-01-23 04:58	116 km	29 km NW of Shizunai-furukawach?, Japan
M6.0 1980-01-12	1980-01-12 15:57	33 km	124 km SE of Shizunai-furukawach?, Japan
M6.4 1979-02-20	1979-02-20 06:32	10 km	164 km ENE of Miyako, Japan
M6.0 1977-12-23	1977-12-23 21:14	41 km	104 km ESE of ?tsuchi, Japan
M6.0 1974-11-08	1974-11-08 21:23	132 km	21 km SE of Tomakomai, Japan
M6.0 1974-10-12	1974-10-12 06:14	24 km	168 km NE of Miyako, Japan
M6.2 1974-10-10	1974-10-10 06:56	45 km	144 km ENE of Hachinohe, Japan
M6.2 1974-10-10	1974-10-10 06:48	29 km	146 km ENE of Hachinohe, 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.