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M6.6 earthquake, Alaska, 1957-03-13

MagnitudeM6.6mw

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Depth25 km

Time (UTC)1957-03-13 15:42

Rank in 195743 / 175among M6+

Rank since 19003951 / 14,458

Energy vs an M6×7approx.

152 km WSW of Adak, Alaska · 51.42, -178.72

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

2007 M7.2M7.2

1905 M7.2M7.2

1957 M7.2M7.2

1957 M7.1M7.1

1970 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M7.1 1957-03-12	1957-03-12 11:45	20 km	60 km SW of Adak, Alaska
M6.4 1957-03-12	1957-03-12 07:39	10 km	133 km SW of Adak, Alaska
M6.5 1957-03-11	1957-03-11 15:36	35 km	173 km WSW of Adak, Alaska
M7.0 1957-03-11	1957-03-11 14:55	25 km	148 km WSW of Adak, Alaska
M6.0 1957-03-11	1957-03-11 03:35	33 km	136 km S of Adak, Alaska
M6.8 1957-03-11	1957-03-11 03:12	15 km	90 km SSW of Adak, Alaska
M6.2 1957-03-10	1957-03-10 13:28	35 km	147 km WSW of Adak, Alaska
M6.2 1957-03-10	1957-03-10 13:10	35 km	Andreanof Islands, Aleutian Islands, Alaska
M6.4 1957-03-10	1957-03-10 12:45	33 km	146 km S of Adak, Alaska
M8.6 1957-03-09	1957-03-09 14:22	25 km	1957 Atka, Alaska 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.