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M7.2 earthquake, Tonga, 1984-10-15

MagnitudeM7.2mw

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Depth128 km

Time (UTC)1984-10-15 10:21

Rank in 19848 / 133among M6+

Rank since 1900927 / 14,458

Energy vs an M6×63approx.

19 km ENE of Hihifo, Tonga · -15.86, -173.64

M6.5+ within 300 km (largest first)

2009 M8.1M8.1

1917 M8.0M8.0

1975 M7.8M7.8

1981 M7.7M7.7

1977 M7.6M7.6

2023 M7.6M7.6

1995 M7.4M7.4

1987 M7.3M7.3

2000 M7.2M7.2

1984 M7.2M7.2

1957 M7.1M7.1

1972 M7.0M7.0

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.6 1984-06-15	1984-06-15 14:22	247 km	111 km W of Hihifo, Tonga
M6.0 1984-04-21	1984-04-21 12:36	73 km	94 km ENE of Hihifo, Tonga
M6.5 1984-04-18	1984-04-18 06:49	150 km	59 km W of Hihifo, Tonga
M6.0 1984-03-23	1984-03-23 20:31	44 km	84 km N of Hihifo, Tonga
M6.2 1983-12-03	1983-12-03 01:23	33 km	123 km NE of Hihifo, Tonga
M6.1 1983-08-30	1983-08-30 08:50	39 km	201 km ESE of Hihifo, Tonga
M6.1 1983-06-01	1983-06-01 10:58	33 km	109 km ENE of Hihifo, Tonga
M6.6 1983-06-01	1983-06-01 01:59	180 km	147 km SW of Hihifo, Tonga
M6.4 1983-01-08	1983-01-08 11:21	33 km	Tonga
M6.3 1982-09-04	1982-09-04 02:08	33 km	97 km NE of Hihifo, 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.