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M7.6 earthquake, Alaska, 1972-07-30

MagnitudeM7.6mw

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Depth20 km

Time (UTC)1972-07-30 21:45

Rank in 19723 / 132among M6+

Rank since 1900350 / 14,458

Energy vs an M6×251approx.

55 km SW of Sitka, Alaska · 56.67, -135.92

M6.5+ within 300 km (largest first)

1958 M7.8M7.8

1972 M7.6M7.6

2013 M7.5M7.5

1927 M7.2M7.2

2004 M6.8M6.8

1973 M6.7M6.7

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M7.8 1958-07-10	1958-07-10 06:15	10 km	22 km W of Elfin Cove, Alaska
M6.2 1956-11-17	1956-11-17 20:27	15 km	96 km SW of Hydaburg, Alaska
M6.1 1952-03-09	1952-03-09 20:00	10 km	77 km SW of Covenant Life, Alaska
M6.2 1949-10-31	1949-10-31 01:39	15 km	78 km WSW of Port Alexander, Alaska
M6.1 1945-11-16	1945-11-16 18:02	15 km	62 km W of Elfin Cove, Alaska
M6.1 1927-12-31	1927-12-31 19:06	15 km	84 km SW of Pelican, Alaska
M7.2 1927-10-24	1927-10-24 15:59	10 km	31 km SSW of Pelican, 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.