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M6.8 earthquake, Tonga, 1990-12-21

MagnitudeM6.8mw

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Depth13 km

Time (UTC)1990-12-21 05:29

Rank in 199024 / 153among M6+

Rank since 19002359 / 14,458

Energy vs an M6×16approx.

74 km SSE of Pangai, Tonga · -20.47, -174.16

M6.5+ within 300 km (largest first)

1919 M8.1M8.1

2006 M8.0M8.0

1903 M8.0M8.0

1950 M7.8M7.8

1913 M7.8M7.8

2009 M7.6M7.6

1948 M7.5M7.5

2026 M7.5M7.5

1921 M7.4M7.4

1907 M7.3M7.3

2022 M7.3M7.3

1906 M7.2M7.2

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1990-09-08	1990-09-08 20:31	33 km	83 km SSE of Pangai, Tonga
M6.9 1990-06-23	1990-06-23 21:38	180 km	139 km WSW of Haveluloto, Tonga
M6.3 1990-05-20	1990-05-20 07:32	232 km	135 km WNW of Neiafu, Tonga
M6.0 1989-03-30	1989-03-30 20:39	230 km	158 km W of Pangai, Tonga
M6.2 1989-01-02	1989-01-02 01:52	108 km	61 km W of Neiafu, Tonga
M7.1 1988-10-08	1988-10-08 04:46	35 km	166 km E of Neiafu, Tonga
M6.4 1988-07-19	1988-07-19 01:00	137 km	76 km WNW of Pangai, Tonga
M6.4 1988-01-15	1988-01-15 08:40	214 km	90 km WNW of Haveluloto, Tonga
M6.0 1987-12-11	1987-12-11 02:03	37 km	92 km S of ‘Ohonua, Tonga
M6.3 1987-10-08	1987-10-08 03:20	40 km	132 km E 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.