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M8.6 earthquake, Alaska Earthquake, 1957-03-09

MagnitudeM8.6mw

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Depth25 km

Time (UTC)1957-03-09 14:22

Rank in 19571 / 175among M6+

Rank since 190012 / 14,458

Energy vs an M6×7,943approx.

1957 Atka, Alaska Earthquake · 51.50, -175.63

M6.5+ within 300 km (largest first)

1957 M8.6M8.6

1986 M8.0M8.0

1996 M7.9M7.9

1905 M7.6M7.6

1929 M7.3M7.3

1996 M7.3M7.3

2011 M7.3M7.3

2007 M7.2M7.2

1905 M7.2M7.2

1957 M7.2M7.2

1957 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1957-01-25	1957-01-25 03:36	45 km	27 km SW of Adak, Alaska
M6.5 1956-12-08	1956-12-08 16:10	25 km	184 km WSW of Adak, Alaska
M6.1 1956-04-18	1956-04-18 11:00	45 km	61 km WSW of Adak, Alaska
M6.0 1955-09-13	1955-09-13 02:00	55 km	36 km E of Adak, Alaska
M6.7 1955-06-20	1955-06-20 12:07	30 km	221 km WSW of Adak, Alaska
M6.1 1955-06-05	1955-06-05 01:53	35 km	222 km WSW of Adak, Alaska
M6.7 1955-06-02	1955-06-02 00:19	20 km	227 km WSW of Adak, Alaska
M6.4 1955-04-28	1955-04-28 19:05	35 km	122 km WSW of Adak, Alaska
M6.6 1954-04-17	1954-04-17 20:10	25 km	193 km WSW of Adak, Alaska
M6.1 1951-01-18	1951-01-18 21:15	46 km	79 km SW of Adak, 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.