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M7.1 earthquake, Alaska, 1970-02-28

MagnitudeM7.1mw

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Depth164 km

Time (UTC)1970-02-28 10:52

Rank in 197013 / 152among M6+

Rank since 19001083 / 14,458

Energy vs an M6×46approx.

58 km WNW of Atka, Alaska · 52.49, -174.91

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

1957 M7.2M7.2

1957 M7.1M7.1

1970 M7.1M7.1

1901 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.2 1968-01-14	1968-01-14 17:43	13 km	173 km WSW of Nikolski, Alaska
M6.1 1968-01-04	1968-01-04 00:57	27 km	188 km E of Atka, Alaska
M6.0 1966-05-15	1966-05-15 14:46	32 km	125 km WSW of Adak, Alaska
M6.9 1965-07-29	1965-07-29 08:29	23 km	240 km SE of Atka, Alaska
M6.1 1961-03-28	1961-03-28 12:29	45 km	34 km ESE of Adak, Alaska
M6.1 1961-01-11	1961-01-11 11:59	20 km	Fox Islands, Aleutian Islands, Alaska
M6.5 1961-01-05	1961-01-05 14:06	32 km	46 km ESE of Adak, Alaska
M6.5 1960-10-14	1960-10-14 21:19	36 km	143 km ESE of Atka, Alaska
M6.0 1960-10-01	1960-10-01 16:11	35 km	130 km ESE of Atka, Alaska
M6.1 1960-07-03	1960-07-03 20:20	15 km	189 km S 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.