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M7.1 earthquake, Alaska, 1957-03-22

MagnitudeM7.1mw

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Depth47 km

Time (UTC)1957-03-22 14:21

Rank in 195718 / 175among M6+

Rank since 19001296 / 14,458

Energy vs an M6×40approx.

39 km S of Akutan, Alaska · 53.78, -165.77

M6.5+ within 300 km (largest first)

1946 M8.6M8.6

1965 M7.8M7.8

1957 M7.1M7.1

1902 M7.0M7.0

1991 M7.0M7.0

1940 M7.0M7.0

1957 M6.9M6.9

1935 M6.9M6.9

1980 M6.9M6.9

1987 M6.9M6.9

2015 M6.9M6.9

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.4 1957-03-17	1957-03-17 22:44	45 km	50 km SE of Akutan, Alaska
M6.4 1957-03-15	1957-03-15 02:52	25 km	118 km E of Nikolski, Alaska
M6.2 1957-03-13	1957-03-13 19:59	50 km	53 km S of Akutan, Alaska
M7.1 1957-03-11	1957-03-11 09:58	35 km	35 km SW of Nikolski, Alaska
M6.9 1957-03-09	1957-03-09 20:39	25 km	80 km SW of Nikolski, Alaska
M6.2 1957-01-09	1957-01-09 07:53	25 km	98 km E of Nikolski, Alaska
M6.1 1957-01-02	1957-01-02 10:49	25 km	75 km SE of Nikolski, Alaska
M6.5 1957-01-02	1957-01-02 04:03	20 km	45 km SSE of Nikolski, Alaska
M6.7 1957-01-02	1957-01-02 03:48	20 km	72 km ESE of Nikolski, Alaska
M6.0 1957-01-02	1957-01-02 03:30	–	62 km ESE of Nikolski, 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.