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M6.9 earthquake, Alaska, 1987-02-27

MagnitudeM6.9mw

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Depth10 km

Time (UTC)1987-02-27 08:31

Rank in 198715 / 166among M6+

Rank since 19001881 / 14,458

Energy vs an M6×22approx.

67 km SW of Unalaska, Alaska · 53.47, -167.29

M6.5+ within 300 km (largest first)

1946 M8.6M8.6

1965 M7.8M7.8

1916 M7.4M7.4

1957 M7.1M7.1

1902 M7.0M7.0

1940 M7.0M7.0

1957 M6.9M6.9

1935 M6.9M6.9

1980 M6.9M6.9

2015 M6.9M6.9

1987 M6.9M6.9

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.8 1987-01-05	1987-01-05 12:11	33 km	64 km SSW of Nikolski, Alaska
M6.0 1986-07-19	1986-07-19 22:32	33 km	64 km SW of Unalaska, Alaska
M6.0 1986-07-19	1986-07-19 06:53	33 km	51 km SW of Unalaska, Alaska
M6.0 1986-04-11	1986-04-11 17:22	33 km	93 km WNW of Dutch Harbor, Alaska
M6.2 1985-10-31	1985-10-31 19:33	30 km	74 km SSW of Unalaska, Alaska
M6.1 1982-01-25	1982-01-25 05:29	60 km	90 km SE of Unalaska, Alaska
M6.1 1980-03-24	1980-03-24 04:02	33 km	102 km ESE of Nikolski, Alaska
M6.9 1980-03-24	1980-03-24 03:59	33 km	80 km E of Nikolski, Alaska
M6.2 1979-05-25	1979-05-25 16:45	23 km	129 km ESE of Nikolski, Alaska
M6.0 1977-05-30	1977-05-30 15:16	33 km	80 km SW of Nikolski, 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.