Strong mag. 6.3 earthquake - North Pacific Ocean, 43 mi east of Tigalda Island, Aleutians East County, Alaska, USA, on Sunday, 20 August 1939 at 07:17 (GMT)

Strong mag. 6.3 earthquake - North Pacific Ocean, 43 mi east of Tigalda Island, Aleutians East County, Alaska, USA, on Sunday, 20 August 1939 at 07:17 (GMT)

Strong magnitude 6.3 earthquake at 75 km depth

Date & time: 20 Aug 1939 07:17:26 UTC
Magnitude: 6.3
Depth: 75.0 km
Epicenter latitude / longitude: 54°N / 164°W (North Pacific Ocean, Alaska, United States)
Nearest volcano: Westdahl (71 km / 44 mi)
Nearby towns and cities:
102 km (64 mi) SSW of False Pass (pop: 40) --> See nearby quakes!
117 km (73 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
156 km (97 mi) SSW of Cold Bay (pop: 123) --> See nearby quakes!
160 km (100 mi) SW of King Cove (pop: 1,010) --> See nearby quakes!
167 km (103 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
270 km (168 mi) WSW of Sand Point (pop: 1,060) --> See nearby quakes!
285 km (177 mi) SW of Nelson Lagoon (pop: 52) --> See nearby quakes!
376 km (234 mi) WSW of Perryville (pop: 113) --> See nearby quakes!
417 km (259 mi) SW of Chignik Lake (pop: 73) --> See nearby quakes!
432 km (268 mi) SW of Chignik Lagoon (pop: 78) --> 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 6.375 kmUnimak 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
to top

Aftershocks

More info
Recorded aftershocks, latest first (0 quakes):
So far, no aftershocks have been registered.
to top

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.