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M6.6 earthquake, Alaska, 1977-09-04

MagnitudeM6.6ms

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Depth8 km

Time (UTC)1977-09-04 17:24

Rank in 197723 / 85among M6+

Rank since 19003464 / 14,458

Energy vs an M6×8approx.

Rat Islands, Aleutian Islands, Alaska · 51.14, 177.95

M6.5+ within 300 km (largest first)

1965 M8.7M8.7

1906 M8.3M8.3

2014 M7.9M7.9

2003 M7.8M7.8

1965 M7.6M7.6

1965 M7.4M7.4

1939 M7.2M7.2

2003 M7.1M7.1

1916 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
M6.4 1977-09-04	1977-09-04 17:10	31 km	Rat Islands, Aleutian Islands, Alaska
M6.4 1977-09-04	1977-09-04 15:40	34 km	Rat Islands, Aleutian Islands, Alaska
M6.7 1971-06-11	1971-06-11 13:58	27 km	242 km SE of Attu Station, Alaska
M6.3 1970-03-19	1970-03-19 23:33	18 km	169 km S of Attu Station, Alaska
M6.1 1968-12-15	1968-12-15 02:28	29 km	220 km SE of Attu Station, Alaska
M6.2 1968-12-15	1968-12-15 02:14	36 km	230 km SE of Attu Station, Alaska
M6.8 1966-07-04	1966-07-04 18:33	18 km	246 km W of Adak, Alaska
M6.0 1965-10-19	1965-10-19 20:48	39 km	93 km SE of Attu Station, Alaska
M6.8 1965-10-01	1965-10-01 08:52	16 km	south of the Aleutian Islands
M7.6 1965-03-30	1965-03-30 02:27	24 km	Rat Islands, Aleutian Islands, 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.