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M6.8 earthquake, Tonga, 1999-04-13

MagnitudeM6.8mwc

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Depth164 km

Time (UTC)1999-04-13 10:38

Rank in 199925 / 135among M6+

Rank since 19002403 / 14,458

Energy vs an M6×16approx.

132 km WSW of Haveluloto, Tonga · -21.42, -176.46

M6.5+ within 300 km (largest first)

2006 M8.0M8.0

1903 M8.0M8.0

1997 M7.8M7.8

1919 M7.8M7.8

1950 M7.8M7.8

1913 M7.8M7.8

2009 M7.6M7.6

1948 M7.5M7.5

1962 M7.5M7.5

1957 M7.4M7.4

1996 M7.4M7.4

2013 M7.4M7.4

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.3 1999-02-03	1999-02-03 01:13	33 km	54 km S of Pangai, Tonga
M6.1 1999-01-24	1999-01-24 07:01	33 km	37 km NE of ‘Ohonua, Tonga
M6.8 1998-12-27	1998-12-27 00:38	144 km	131 km WSW of Haveluloto, Tonga
M6.3 1998-11-15	1998-11-15 02:44	149 km	142 km WSW of Haveluloto, Tonga
M6.0 1998-07-19	1998-07-19 15:58	72 km	95 km SW of Vaini, Tonga
M6.2 1998-04-11	1998-04-11 00:44	33 km	281 km SSW of ‘Ohonua, Tonga
M6.0 1998-01-27	1998-01-27 02:14	643 km	Fiji region
M6.0 1997-10-17	1997-10-17 15:02	579 km	Fiji region
M7.8 1997-10-14	1997-10-14 09:53	167 km	192 km WSW of Haveluloto, Tonga
M6.1 1997-09-10	1997-09-10 12:57	10 km	58 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.