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M6.6 earthquake, Alaska, 1940-02-07

MagnitudeM6.6mw

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Depth15 km

Time (UTC)1940-02-07 17:15

Rank in 194023 / 105among M6+

Rank since 19003891 / 14,458

Energy vs an M6×7approx.

201 km SE of Attu Station, Alaska · 51.36, 174.85

M6.5+ within 300 km (largest first)

1965 M8.7M8.7

1906 M8.3M8.3

2014 M7.9M7.9

1929 M7.9M7.9

2003 M7.8M7.8

1975 M7.6M7.6

1965 M7.6M7.6

1907 M7.4M7.4

1939 M7.2M7.2

2003 M7.1M7.1

1940 M7.0M7.0

1916 M7.0M7.0

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M7.2 1939-09-08	1939-09-08 12:04	15 km	238 km SSE of Attu Station, Alaska
M6.1 1939-08-21	1939-08-21 15:19	35 km	286 km ESE of Attu Station, Alaska
M6.8 1935-02-22	1935-02-22 17:06	30 km	95 km SE of Attu Station, Alaska
M6.0 1931-05-30	1931-05-30 11:34	–	72 km S of Attu Station, Alaska
M7.9 1929-12-17	1929-12-17 10:58	20 km	93 km NW of Attu Station, Alaska
M6.3 1925-01-30	1925-01-30 17:28	28 km	76 km WNW of Attu Station, Alaska
M6.4 1924-09-14	1924-09-14 13:13	25 km	Rat Islands, Aleutian Islands, Alaska
M6.4 1923-07-31	1923-07-31 15:07	15 km	124 km SSW of Attu Station, Alaska
M6.5 1923-07-22	1923-07-22 14:18	25 km	66 km S of Attu Station, Alaska
M6.3 1916-12-14	1916-12-14 16:52	35 km	251 km SE of Attu Station, Alaska

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.