Very strong mag. 6.3 earthquake - Gulf of Alaska, 78 mi south of Kodiak, Alaska, USA, on Thursday, 1 August 1974 at 05:55 (GMT)

Very strong mag. 6.3 earthquake - Gulf of Alaska, 78 mi south of Kodiak, Alaska, USA, on Thursday, 1 August 1974 at 05:55 (GMT)

Very strong magnitude 6.3 earthquake at 33 km depth

Date & time: 1 Aug 1974 05:55:38 UTC
Magnitude: 6.3
Depth: 33.0 km
Epicenter latitude / longitude: 56.67°N / 152.105°W (Gulf of Alaska, Alaska, United States)
Nearest volcano: Kukak (239 km / 149 mi)
Nearby towns and cities:
94 km (58 mi) SE of Old Harbor (pop: 221) --> See nearby quakes!
125 km (78 mi) SSE of Kodiak Station (pop: 1,300) --> See nearby quakes!
126 km (78 mi) S of Kodiak (pop: 6,250) --> See nearby quakes!
332 km (206 mi) S of Homer (pop: 5,520) --> See nearby quakes!
344 km (214 mi) S of Fritz Creek (pop: 1,930) --> See nearby quakes!
420 km (261 mi) S of Kalifornsky (pop: 7,850) --> See nearby quakes!
429 km (267 mi) S of Soldotna (pop: 4,540) --> See nearby quakes!
435 km (270 mi) S of Kenai (pop: 7,660) --> See nearby quakes!
437 km (272 mi) S of Sterling (pop: 5,620) --> See nearby quakes!
450 km (279 mi) S of Nikiski (pop: 4,490) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.8 x 1014 joules (49.4 gigawatt hours, equivalent to 42502 tons of TNT or 2.7 atomic bombs!) More info
Show interactive Map
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
Also if you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable also to earthquake science and earthquake hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

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 6.333 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

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake yet. If you felt it be the first to report it!
Volcanoes & Earthquakes - new app for Android

Aftershocks

More info
Recorded aftershocks, latest first (28 quakes):
  • 14 Nov 1974 11:55 UTC
    | M 3.7 |
    33 km (20.5 mi) depth
    |
    73 km (45 mi) distance
    | USGS | Details
  • 17 Sep 1974 02:01 UTC
    | M 5.1 |
    17 km (10.6 mi) depth
    |
    28 km (17 mi) distance
    | USGS | Details
  • 07 Aug 1974 15:59 UTC
    | M 4.5 |
    33 km (20.5 mi) depth
    |
    14 km (9 mi) distance
    | USGS | Details
  • 07 Aug 1974 15:30 UTC
    | M 4.6 |
    33 km (20.5 mi) depth
    |
    19 km (12 mi) distance
    | USGS | Details
  • 07 Aug 1974 08:50 UTC
    | M 3.9 |
    67 km (41.6 mi) depth
    |
    26 km (16 mi) distance
    | USGS | Details
  • 07 Aug 1974 08:23 UTC
    | M 5.3 |
    33 km (20.5 mi) depth
    |
    13 km (8 mi) distance
    | USGS | Details
  • 07 Aug 1974 08:21 UTC
    | M 4.6 |
    32 km (19.9 mi) depth
    |
    17 km (11 mi) distance
    | USGS | Details
  • 06 Aug 1974 18:05 UTC
    | M 4.6 |
    33 km (20.5 mi) depth
    |
    20 km (12 mi) distance
    | USGS | Details
  • 06 Aug 1974 12:59 UTC
    | M 4.7 |
    16 km (9.9 mi) depth
    |
    26 km (16 mi) distance
    | USGS | Details
  • 04 Aug 1974 21:36 UTC
    | M 4.3 |
    40 km (24.9 mi) depth
    |
    11 km (7 mi) distance
    | USGS | Details
  • 03 Aug 1974 20:03 UTC
    | M 4.1 |
    33 km (20.5 mi) depth
    |
    14 km (9 mi) distance
    | USGS | Details
  • 02 Aug 1974 17:03 UTC
    | M 4.1 |
    36 km (22.4 mi) depth
    |
    12 km (7 mi) distance
    | USGS | Details
  • 02 Aug 1974 09:22 UTC
    | M 4.0 |
    64 km (39.8 mi) depth
    |
    48 km (30 mi) distance
    | USGS | Details
  • 01 Aug 1974 15:29 UTC
    | M 4.0 |
    33 km (20.5 mi) depth
    |
    14 km (9 mi) distance
    | USGS | Details
  • 01 Aug 1974 14:05 UTC
    | M 3.8 |
    33 km (20.5 mi) depth
    |
    3 km (2 mi) distance
    | USGS | Details
  • 01 Aug 1974 08:26 UTC
    | M 3.9 |
    33 km (20.5 mi) depth
    |
    5 km (3 mi) distance
    | USGS | Details
  • Show all

Earlier earthquakes in the same area

Volcanoes & Earthquakes - new app for Android
Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Weather reports
  • Tsunami alerts
  • Design upgrades
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Additional seismic data sources
  • Improved content in English
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.