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M6.8 earthquake, Tonga, 1977-06-22

MagnitudeM6.8mb

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Depth65 km

Time (UTC)1977-06-22 12:08

Rank in 197714 / 85among M6+

Rank since 19002300 / 14,458

Energy vs an M6×16approx.

Tonga region · -22.88, -175.90

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

1937 M7.3M7.3

1960 M7.2M7.2

1982 M7.2M7.2

1986 M7.2M7.2

1992 M7.2M7.2

1996 M7.2M7.2

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
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
M6.0 1975-05-18	1975-05-18 23:53	43 km	108 km ENE of ‘Ohonua, 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
M6.3 1971-03-23	1971-03-23 02:15	73 km	225 km SSW of ‘Ohonua, Tonga
M6.3 1970-07-17	1970-07-17 20:04	21 km	82 km SSE of ‘Ohonua, Tonga
M6.0 1970-02-18	1970-02-18 15:23	252 km	158 km WNW of Haveluloto, Tonga
M6.1 1968-09-26	1968-09-26 14:37	249 km	166 km W of Haveluloto, Tonga
M6.3 1968-07-29	1968-07-29 11:12	50 km	129 km S 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.