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M7.7 earthquake, Kermadec Islands, 1986-10-20

MagnitudeM7.7mw

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Depth29 km

Time (UTC)1986-10-20 06:46

Rank in 19862 / 138among M6+

Rank since 1900267 / 14,458

Energy vs an M6×355approx.

Kermadec Islands region · -28.12, -176.37

M6.5+ within 300 km (largest first)

2021 M8.1M8.1

1976 M8.0M8.0

2007 M7.8M7.8

1986 M7.7M7.7

2011 M7.6M7.6

1955 M7.5M7.5

1917 M7.5M7.5

2011 M7.4M7.4

2021 M7.4M7.4

1959 M7.3M7.3

1963 M7.3M7.3

1970 M7.3M7.3

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.1 1986-06-29	1986-06-29 11:57	10 km	Kermadec Islands region
M6.0 1986-06-24	1986-06-24 19:31	11 km	Kermadec Islands region
M6.2 1986-03-14	1986-03-14 16:55	42 km	Kermadec Islands region
M6.3 1985-07-06	1985-07-06 03:37	50 km	Kermadec Islands, New Zealand
M6.0 1985-06-21	1985-06-21 04:31	47 km	Kermadec Islands region
M6.6 1984-09-28	1984-09-28 00:03	21 km	south of Tonga
M6.2 1984-05-08	1984-05-08 03:37	33 km	Kermadec Islands, New Zealand
M6.1 1983-12-15	1983-12-15 03:57	20 km	Kermadec Islands region
M6.0 1983-02-07	1983-02-07 18:23	52 km	Kermadec Islands, New Zealand
M6.1 1982-09-20	1982-09-20 12:57	33 km	south of 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.