Major magnitude 6.6 earthquake - Gulf of Alaska, 93 mi south of Kodiak Station, Kodiak Island, Alaska, USA, on Wednesday, 12 April 1978 at 03:42 (GMT)

Major magnitude 6.6 earthquake - Gulf of Alaska, 93 mi south of Kodiak Station, Kodiak Island, Alaska, USA, on Wednesday, 12 April 1978 at 03:42 (GMT)

Tremblement de terre majeur magnitude 6.6 at 14 km depth

Date & time: 12 Apr 1978 03:42:03 UTC
Magnitude: 6.6
Profondeur: 14.0 km
Epicenter latitude / longitude: 56.423°N / 152.691°W (Gulf of Alaska, Alaska, États-Unis)
Volcan le plus près: Unnamed 57.87°N/155.42°W (230 km / 143 mi)
Nearby towns and cities:
95 km SSE de Old Harbor (pop: 221) --> Voir les séismes à proximité!
107 km ESE de Akhiok (pop: 72) --> Voir les séismes à proximité!
140 km S de Womens Bay (pop: 719) --> Voir les séismes à proximité!
149 km S de Kodiak Station (pop: 1,300) --> Voir les séismes à proximité!
153 km S de Kodiak (pop: 6,250) --> Voir les séismes à proximité!
364 km S de Homer (pop: 5,520) --> Voir les séismes à proximité!
376 km S de Anchor Point (pop: 1,930) --> Voir les séismes à proximité!
378 km SSO de Fritz Creek (pop: 1,930) --> Voir les séismes à proximité!
451 km SSO de Seward (pop: 2,790) --> Voir les séismes à proximité!
452 km S de Kalifornsky (pop: 7,850) --> Voir les séismes à proximité!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 5 x 1014 joules (139 gigawatt hours, equivalent to 1.2 x 105 tons of TNT or 7.5 atomic bombs!) Plus d'infos
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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.
MagnitudeProfondeurLieuSource
6.614 kmKodiak Island region, Alaska (USA)USGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

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Aftershocks

More info
Recorded aftershocks, latest first (21 quakes):
  • 19 Aug 1978 03:58 UTC
    | M 4.6 |
    26 km (16.2 mi) depth
    |
    3 km (2 mi) distance
    | USGS | Details
  • 19 Jul 1978 18:53 UTC
    | M 3.0 |
    33 km (20.5 mi) depth
    |
    83 km (52 mi) distance
    | USGS | Details
  • 19 Jul 1978 09:32 UTC
    | M 5.7 |
    33 km (20.5 mi) depth
    |
    75 km (46 mi) distance
    | USGS | Details
  • 21 Jun 1978 02:37 UTC
    | M 4.2 |
    83 km (51.6 mi) depth
    |
    97 km (60 mi) distance
    | USGS | Details
  • 03 Jun 1978 23:11 UTC
    | M 4.4 |
    33 km (20.5 mi) depth
    |
    120 km (74 mi) distance
    | USGS | Details
  • 21 May 1978 14:55 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    10 km (6 mi) distance
    | USGS | Details
  • 28 Apr 1978 02:52 UTC
    | M 4.3 |
    70 km (43.5 mi) depth
    |
    96 km (60 mi) distance
    | USGS | Details
  • 27 Apr 1978 01:41 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    17 km (10 mi) distance
    | USGS | Details
  • 22 Apr 1978 13:24 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    11 km (7 mi) distance
    | USGS | Details
  • 18 Apr 1978 02:18 UTC
    | M 4.5 |
    33 km (20.5 mi) depth
    |
    11 km (7 mi) distance
    | USGS | Details
  • 16 Apr 1978 09:50 UTC
    | M 4.9 |
    24 km (14.9 mi) depth
    |
    27 km (17 mi) distance
    | USGS | Details
  • 14 Apr 1978 18:27 UTC
    | M 4.3 |
    33 km (20.5 mi) depth
    |
    12 km (8 mi) distance
    | USGS | Details
  • 13 Apr 1978 13:59 UTC
    | M 4.5 |
    33 km (20.5 mi) depth
    |
    43 km (27 mi) distance
    | USGS | Details
  • 12 Apr 1978 10:40 UTC
    | M 3.5 |
    33 km (20.5 mi) depth
    |
    79 km (49 mi) distance
    | USGS | Details
  • 12 Apr 1978 09:33 UTC
    | M 5.1 |
    27 km (16.8 mi) depth
    |
    19 km (12 mi) distance
    | USGS | Details
  • 12 Apr 1978 08:56 UTC
    | M 4.6 |
    19 km (11.8 mi) depth
    |
    11 km (7 mi) distance
    | USGS | Details
    • Show all

Earlier earthquakes in the same area

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