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M6.6 earthquake, Alaska, 1968-04-23

MagnitudeM6.6mw

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Depth19 km

Time (UTC)1968-04-23 20:29

Rank in 196837 / 159among M6+

Rank since 19003326 / 14,458

Energy vs an M6×9approx.

124 km SSE of Halibut Cove, Alaska · 58.65, -150.08

M6.5+ within 300 km (largest first)

1964 M9.2M9.2

2018 M7.9M7.9

1900 M7.9M7.9

2016 M7.1M7.1

1912 M7.1M7.1

1906 M7.0M7.0

1912 M7.0M7.0

1999 M7.0M7.0

1928 M7.0M7.0

2001 M6.9M6.9

1933 M6.8M6.8

1936 M6.8M6.8

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.1 1966-04-16	1966-04-16 01:27	35 km	36 km ESE of Akhiok, Alaska
M6.2 1965-12-22	1965-12-22 19:41	51 km	37 km NNW of Aleneva, Alaska
M6.8 1965-09-04	1965-09-04 14:32	29 km	17 km N of Ouzinkie, Alaska
M6.2 1965-06-23	1965-06-23 11:09	22 km	76 km SSE of Old Harbor, Alaska
M6.1 1964-09-16	1964-09-16 01:50	14 km	53 km E of Chenega, Alaska
M6.2 1964-05-12	1964-05-12 18:16	24 km	97 km SSE of Old Harbor, Alaska
M6.3 1964-04-12	1964-04-12 01:24	10 km	98 km SE of Old Harbor, Alaska
M6.1 1964-04-04	1964-04-04 08:40	15 km	95 km SSE of Old Harbor, Alaska
M6.0 1964-03-30	1964-03-30 16:09	15 km	94 km SE of Old Harbor, Alaska
M6.0 1964-03-30	1964-03-30 07:09	11 km	78 km S of Cordova, 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.