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M6.7 earthquake, Tonga, 1983-03-21

MagnitudeM6.7mw

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Depth68 km

Time (UTC)1983-03-21 07:44

Rank in 198328 / 136among M6+

Rank since 19002860 / 14,458

Energy vs an M6×11approx.

41 km SW of Vaini, Tonga · -21.47, -175.45

M6.5+ within 300 km (largest first)

2006 M8.0M8.0

1903 M8.0M8.0

1997 M7.8M7.8

1950 M7.8M7.8

1913 M7.8M7.8

2009 M7.6M7.6

1948 M7.5M7.5

1962 M7.5M7.5

2013 M7.4M7.4

1937 M7.3M7.3

1910 M7.2M7.2

1911 M7.2M7.2

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.3 1982-12-20	1982-12-20 17:46	33 km	265 km SSW of ‘Ohonua, Tonga
M6.3 1982-12-20	1982-12-20 02:58	32 km	284 km SSW of ‘Ohonua, Tonga
M6.0 1982-12-20	1982-12-20 01:30	33 km	south of Tonga
M7.2 1982-12-19	1982-12-19 17:43	33 km	south of Tonga
M6.0 1982-01-04	1982-01-04 22:20	195 km	south of the Fiji Islands
M6.3 1981-11-04	1981-11-04 14:38	33 km	26 km SSE of Pangai, Tonga
M6.1 1980-12-19	1980-12-19 02:57	33 km	61 km E of ‘Ohonua, Tonga
M6.0 1980-11-30	1980-11-30 12:24	202 km	162 km WNW of Pangai, Tonga
M6.7 1980-04-13	1980-04-13 18:04	79 km	south of the Fiji Islands
M6.1 1980-04-01	1980-04-01 11:11	37 km	125 km SE of Pangai, Tonga

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.