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M6.6 earthquake, Tonga, 1979-11-13

MagnitudeM6.6ms

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Depth32 km

Time (UTC)1979-11-13 20:43

Rank in 197921 / 86among M6+

Rank since 19003473 / 14,458

Energy vs an M6×8approx.

248 km S of ‘Ohonua, Tonga · -23.58, -174.86

M6.5+ within 300 km (largest first)

1975 M7.8M7.8

1997 M7.8M7.8

1963 M7.6M7.6

2009 M7.6M7.6

1948 M7.5M7.5

2013 M7.4M7.4

1905 M7.4M7.4

1977 M7.2M7.2

1960 M7.2M7.2

1982 M7.2M7.2

1986 M7.2M7.2

1996 M7.2M7.2

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.4 1979-08-05	1979-08-05 00:53	181 km	292 km SW of Haveluloto, Tonga
M6.3 1978-03-04	1978-03-04 04:46	33 km	62 km S of ‘Ohonua, Tonga
M6.1 1977-12-08	1977-12-08 06:15	33 km	south of Tonga
M6.2 1977-12-04	1977-12-04 05:50	56 km	south of the Fiji Islands
M7.2 1977-10-10	1977-10-10 11:53	33 km	south of Tonga
M6.8 1977-06-22	1977-06-22 12:08	65 km	Tonga region
M6.1 1975-10-11	1975-10-11 14:55	33 km	south of Tonga
M7.8 1975-10-11	1975-10-11 14:35	9 km	south of Tonga
M6.3 1974-09-21	1974-09-21 12:40	33 km	283 km SSW of ‘Ohonua, Tonga
M6.1 1972-08-28	1972-08-28 18:58	10 km	68 km E of ‘Ohonua, 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.