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M6.6 earthquake, Alaska, 1940-03-27

MagnitudeM6.6mw

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Depth50 km

Time (UTC)1940-03-27 12:31

Rank in 194024 / 105among M6+

Rank since 19003934 / 14,458

Energy vs an M6×7approx.

276 km WSW of Adak, Alaska · 51.43, 179.43

M6.5+ within 300 km (largest first)

1965 M8.7M8.7

1906 M8.3M8.3

2014 M7.9M7.9

2003 M7.8M7.8

1965 M7.6M7.6

1965 M7.4M7.4

2003 M7.1M7.1

1916 M7.0M7.0

1981 M7.0M7.0

2003 M6.9M6.9

1965 M6.8M6.8

1966 M6.8M6.8

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.1 1939-08-21	1939-08-21 15:19	35 km	286 km ESE of Attu Station, Alaska
M6.1 1936-04-23	1936-04-23 23:14	15 km	Rat Islands, Aleutian Islands, Alaska
M6.5 1930-05-20	1930-05-20 11:15	25 km	280 km W of Adak, Alaska
M6.7 1930-04-26	1930-04-26 16:18	35 km	275 km WSW of Adak, Alaska
M6.5 1930-02-02	1930-02-02 14:56	25 km	253 km WSW of Adak, Alaska
M6.4 1924-09-14	1924-09-14 13:13	25 km	Rat Islands, Aleutian Islands, Alaska
M6.2 1919-07-14	1919-07-14 13:45	35 km	249 km W of Adak, Alaska
M6.3 1916-12-14	1916-12-14 16:52	35 km	251 km SE of Attu Station, Alaska
M7.0 1916-02-06	1916-02-06 21:51	15 km	Rat Islands, Aleutian Islands, Alaska
M8.3 1906-08-17	1906-08-17 00:11	110 km	1906 Western Aleutian Islands (Hawadax/Rat Islands) Earthquake

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.