Major magnitude 6.9 earthquake - Aleutians West County, 42 mi southwest of Уналашка, Aleutians West (CA) County, Alaska, USA, on Friday, 27 February 1987 at 08:31 (GMT)

Major magnitude 6.9 earthquake - Aleutians West County, 42 mi southwest of Уналашка, Aleutians West (CA) County, Alaska, USA, on Friday, 27 February 1987 at 08:31 (GMT)

Major magnitude 6.9 earthquake at 10 km depth

Date & time: 27 Feb 1987 08:31:54 UTC
Magnitude: 6.9
Depth: 10.0 km
Epicenter latitude / longitude: 53.47°N / 167.291°W (Aleutians West County, Alaska, United States)
Nearest volcano: Makushin (53 km / 33 mi)
Nearby towns and cities:
67 km (42 mi) SW of Unalaska (pop: 4,490) --> See nearby quakes!
120 km (75 mi) ENE of Nikolski (pop: 18) --> See nearby quakes!
124 km (77 mi) SW of Akutan (pop: 1,040) --> See nearby quakes!
296 km (184 mi) WSW of False Pass (pop: 40) --> See nearby quakes!
352 km (219 mi) WSW of Cold Bay (pop: 123) --> See nearby quakes!
368 km (229 mi) WSW of King Cove (pop: 1,010) --> See nearby quakes!
481 km (299 mi) SW of Nelson Lagoon (pop: 52) --> See nearby quakes!
486 km (302 mi) WSW of Sand Point (pop: 1,060) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.4 x 1015 joules (392 gigawatt hours, equivalent to 3.4 x 105 tons of TNT or 21.1 atomic bombs!) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
MagnitudeDepthLocationSource
M 6.910 kmFox Islands, Aleutian Islands, Alaska (USA)USGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Aftershocks

More info
Recorded aftershocks, latest first (51 quakes):
  • 14 Aug 1987 17:39 UTC
    | M 6.0 |
    117.6 km (73.1 mi) depth
    |
    121 km (75 mi) distance
    | USGS | Strong mag. 6.0 earthquake - Bering Sea, 30 mi north of Anangula Island, Aleutians West County, Alaska, USA, on Friday, 14 August 1987 at 17:39 (GMT)
  • 08 Aug 1987 17:54 UTC
    | M 4.6 |
    33 km (20.5 mi) depth
    |
    40 km (25 mi) distance
    | USGS | Details
  • 06 Jul 1987 04:14 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    41 km (26 mi) distance
    | USGS | Details
  • 13 Jun 1987 11:19 UTC
    | M 4.5 |
    33 km (20.5 mi) depth
    |
    37 km (23 mi) distance
    | USGS | Details
  • 12 Jun 1987 18:52 UTC
    | M 4.1 |
    33 km (20.5 mi) depth
    |
    35 km (22 mi) distance
    | USGS | Details
  • 29 May 1987 11:51 UTC
    | M 4.6 |
    33 km (20.5 mi) depth
    |
    34 km (21 mi) distance
    | USGS | Details
  • 26 May 1987 07:38 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    46 km (29 mi) distance
    | USGS | Details
  • 25 Apr 1987 02:48 UTC
    | M 3.9 |
    33 km (20.5 mi) depth
    |
    39 km (24 mi) distance
    | USGS | Details
  • 14 Apr 1987 02:33 UTC
    | M 4.4 |
    33 km (20.5 mi) depth
    |
    10 km (6 mi) distance
    | USGS | Details
  • 12 Apr 1987 04:56 UTC
    | M 4.5 |
    33 km (20.5 mi) depth
    |
    7 km (5 mi) distance
    | USGS | Details
  • 11 Apr 1987 16:22 UTC
    | M 5.1 |
    33 km (20.5 mi) depth
    |
    9 km (5 mi) distance
    | USGS | Details
  • 09 Apr 1987 22:59 UTC
    | M 5.7 |
    33 km (20.5 mi) depth
    |
    98 km (61 mi) distance
    | USGS | Details
  • 07 Apr 1987 15:56 UTC
    | M 4.6 |
    33 km (20.5 mi) depth
    |
    5 km (3 mi) distance
    | USGS | Details
  • 02 Apr 1987 15:38 UTC
    | M 4.8 |
    33 km (20.5 mi) depth
    |
    96 km (60 mi) distance
    | USGS | Details
  • 31 Mar 1987 14:01 UTC
    | M 4.2 |
    10 km (6.2 mi) depth
    |
    27 km (17 mi) distance
    | USGS | Details
  • 24 Mar 1987 15:30 UTC
    | M 4.4 |
    10 km (6.2 mi) depth
    |
    27 km (17 mi) distance
    | USGS | Details
  • Show all

Earlier earthquakes in the same area

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