Home › 1987 › Alaska

M6.5 earthquake, Alaska, 1987-06-21

MagnitudeM6.5mw

This page is updated only once a day and is not an alert service. For current earthquake and tsunami information, check the Japan Meteorological Agency, the USGS and your local authorities.

Depth34 km

Time (UTC)1987-06-21 05:46

Rank in 198754 / 166among M6+

Rank since 19004378 / 14,458

Energy vs an M6×6approx.

88 km SE of False Pass, Alaska · 54.21, -162.60

M6.5+ within 300 km (largest first)

1946 M8.6M8.6

2020 M7.8M7.8

2020 M7.6M7.6

1917 M7.4M7.4

2025 M7.3M7.3

2023 M7.2M7.2

1948 M7.1M7.1

1957 M7.1M7.1

1991 M7.0M7.0

1940 M7.0M7.0

1993 M6.9M6.9

1922 M6.8M6.8

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.1 1985-11-14	1985-11-14 22:17	33 km	79 km SE of Sand Point, Alaska
M6.6 1985-10-09	1985-10-09 09:33	30 km	85 km SE of Sand Point, Alaska
M6.5 1983-02-14	1983-02-14 03:20	47 km	94 km ESE of Sand Point, Alaska
M6.1 1982-01-25	1982-01-25 05:29	60 km	90 km SE of Unalaska, Alaska
M6.0 1979-01-27	1979-01-27 18:57	17 km	75 km ESE of King Cove, Alaska
M6.2 1975-08-02	1975-08-02 10:18	33 km	194 km SSE of King Cove, Alaska
M6.0 1974-04-06	1974-04-06 03:56	40 km	24 km S of Sand Point, Alaska
M6.5 1974-02-06	1974-02-06 04:04	2 km	81 km ESE of Akutan, Alaska
M6.0 1973-05-29	1973-05-29 06:14	30 km	96 km SSW of False Pass, Alaska
M6.1 1972-06-12	1972-06-12 19:47	36 km	63 km SSW of Unalaska, 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.