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M6.8 earthquake, Alaska, 1987-05-06

MagnitudeM6.8mw

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Depth20 km

Time (UTC)1987-05-06 04:06

Rank in 198723 / 166among M6+

Rank since 19002340 / 14,458

Energy vs an M6×16approx.

235 km WSW of Adak, Alaska · 51.27, -179.90

M6.5+ within 300 km (largest first)

1957 M8.6M8.6

1996 M7.9M7.9

1905 M7.6M7.6

1929 M7.3M7.3

1996 M7.3M7.3

2007 M7.2M7.2

1905 M7.2M7.2

1957 M7.2M7.2

1957 M7.1M7.1

1910 M7.0M7.0

1929 M7.0M7.0

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.4 1987-03-21	1987-03-21 10:41	93 km	65 km WNW of Adak, Alaska
M6.2 1987-02-18	1987-02-18 00:00	33 km	194 km WSW of Adak, Alaska
M6.5 1986-06-18	1986-06-18 08:05	27 km	57 km S of Adak, Alaska
M6.2 1985-05-24	1985-05-24 22:04	34 km	134 km WSW of Adak, Alaska
M6.0 1982-07-01	1982-07-01 07:41	48 km	234 km WSW of Adak, Alaska
M6.7 1978-05-24	1978-05-24 06:16	25 km	192 km WSW of Adak, Alaska
M6.7 1977-11-04	1977-11-04 09:52	33 km	52 km ESE of Adak, Alaska
M6.5 1975-02-22	1975-02-22 08:36	48 km	200 km WSW of Adak, Alaska
M6.3 1972-08-03	1972-08-03 04:40	30 km	134 km SW of Adak, Alaska
M7.0 1971-05-02	1971-05-02 06:08	25 km	69 km SW 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.