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M7.8 earthquake, south of Tonga, 1975-10-11

MagnitudeM7.8ms

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Depth9 km

Time (UTC)1975-10-11 14:35

Rank in 19753 / 106among M6+

Rank since 1900190 / 14,458

Energy vs an M6×501approx.

south of Tonga · -24.89, -175.12

M6.5+ within 300 km (largest first)

2007 M7.8M7.8

1975 M7.8M7.8

1963 M7.6M7.6

2009 M7.6M7.6

1905 M7.4M7.4

1970 M7.3M7.3

1977 M7.2M7.2

1960 M7.2M7.2

1982 M7.2M7.2

1996 M7.2M7.2

2023 M7.2M7.2

1956 M7.0M7.0

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.3 1974-09-21	1974-09-21 12:40	33 km	283 km SSW of ‘Ohonua, Tonga
M6.1 1974-04-27	1974-04-27 07:24	45 km	south of Tonga
M6.0 1971-09-12	1971-09-12 08:06	98 km	south of the Fiji Islands
M6.3 1971-03-23	1971-03-23 02:15	73 km	225 km SSW of ‘Ohonua, Tonga
M7.3 1970-01-20	1970-01-20 07:19	50 km	south of the Fiji Islands
M6.3 1968-07-29	1968-07-29 11:12	50 km	129 km S of ‘Ohonua, Tonga
M6.5 1967-12-27	1967-12-27 16:22	10 km	142 km SSE of ‘Ohonua, Tonga
M6.7 1967-08-12	1967-08-12 09:39	144 km	south of the Fiji Islands
M6.5 1967-02-17	1967-02-17 10:10	25 km	282 km S of ‘Ohonua, Tonga
M6.1 1966-08-20	1966-08-20 22:55	43 km	275 km SSW 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.