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M7.0 earthquake, Alaska, 1940-04-16

MagnitudeM7.0mw

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Depth30 km

Time (UTC)1940-04-16 06:43

Rank in 19407 / 105among M6+

Rank since 19001318 / 14,458

Energy vs an M6×38approx.

24 km E of Attu Station, Alaska · 52.85, 173.55

M6.5+ within 300 km (largest first)

1929 M7.9M7.9

1975 M7.6M7.6

1907 M7.4M7.4

1939 M7.2M7.2

1990 M7.1M7.1

1940 M7.0M7.0

1909 M7.0M7.0

1953 M7.0M7.0

1981 M7.0M7.0

2003 M6.9M6.9

1911 M6.8M6.8

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M7.0 1940-04-16	1940-04-16 06:07	30 km	80 km SSE of Attu Station, Alaska
M6.6 1940-02-07	1940-02-07 17:15	15 km	201 km SE of Attu Station, Alaska
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
M6.0 1939-07-14	1939-07-14 08:31	15 km	249 km WNW of Attu Station, Alaska
M6.2 1936-11-15	1936-11-15 22:20	15 km	192 km WNW 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 1925-09-05	1925-09-05 16:30	25 km	236 km NW 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.