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M8.1 earthquake, 2009 Samoa Earthquake, 2009-09-29

MagnitudeM8.1mwc

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Depth18 km

Time (UTC)2009-09-29 17:48

Rank in 20091 / 160among M6+

Rank since 190072 / 14,458

Energy vs an M6×1,413approx.

2009 Samoa Earthquake · -15.49, -172.09

M5.5+ within 100 km in the next 30 days

Event	Time (UTC)	Depth	Place
M5.6 2009-09-29	2009-09-29 18:08	10 km	173 km SSW of Matavai, Samoa
M5.6 2009-09-29	2009-09-29 18:19	10 km	198 km SSW of Vailoatai, American Samoa
M6.0 2009-09-29	2009-09-29 23:45	10 km	134 km E of Hihifo, Tonga
M5.7 2009-10-17	2009-10-17 10:45	10 km	198 km ESE of Hihifo, Tonga
M5.8 2009-10-19	2009-10-19 07:41	10 km	104 km ENE of Hihifo, Tonga
M6.0 2009-10-19	2009-10-19 22:49	18 km	159 km SSW of Lotofag?, Samoa

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

1984 M7.2M7.2

2000 M7.2M7.2

1957 M7.1M7.1

1978 M7.0M7.0

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.6 2009-08-30	2009-08-30 14:51	11 km	154 km ENE of Hihifo, Tonga
M6.0 2008-12-24	2008-12-24 09:11	9 km	249 km SE of Hihifo, Tonga
M6.0 2008-11-08	2008-11-08 07:49	121 km	93 km NNW of Hihifo, Tonga
M6.1 2008-08-19	2008-08-19 16:30	8 km	101 km NNE of Hihifo, Tonga
M6.2 2007-12-13	2007-12-13 15:51	17 km	147 km SSW of Lotofag?, Samoa
M6.9 2006-09-28	2006-09-28 06:22	28 km	201 km ESE of Hihifo, Tonga
M6.0 2006-07-07	2006-07-07 07:26	35 km	81 km NNE of Hihifo, Tonga
M6.0 2006-04-30	2006-04-30 19:33	10 km	88 km ENE of Hihifo, Tonga
M6.2 2005-05-18	2005-05-18 10:27	10 km	92 km NE of Hihifo, Tonga
M6.2 2004-09-03	2004-09-03 19:04	10 km	91 km NNE 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.