Get our newsletter!
Check out our volcano tours on!
Volcanoes & Earthquakes - new app for Android
Guaranteed tours
8-16 May 2021: From Stromboli to Etna - Sicila and Eolian Islands (Italy)
: spaces available / : guaranteed / : few spaces left / : booked out
Interactive map of latest earthquakes and active volcanoes in the world

Moderate mag. 5.6 earthquake - 127 Km SSW of Nikolski, Alaska, USA on Sunday, 27 September 2020

Moderate mag. 5.6 earthquake  - 127 Km SSW of Nikolski, Alaska, USA on Sunday, 27 September 2020
27 Sep 04:18 UTC: First to report: USGS after 6 minutes.
27 Sep 04:32: Magnitude recalculated from 5.2 to 5.6. Hypocenter depth recalculated from 34.0 to 13.8 km (from 21 to 8.6 mi). Epicenter location corrected by 53 km (33 mi) towards NNW.
Date & time: Sunday, 27 September 2020 04:12 UTC
Local time at epicenter: 26 Sep 7:12 pm (GMT -9)
Magnitude: 5.6
Depth: 13.8 km
Epicenter latitude / longitude: 51.9341°N / 169.7665°W (Alaska, United States)
Nearest volcano: Herbert (145 km / 90 mi)
Weather at epicenter at time of quake:
Broken Clouds 8.4°C (47 F), humidity: 75%, wind: 7 m/s (14 kts) from NNW
Primary data source: USGS
Estimated released energy: 1.6 x 1013 joules (4.4 gigawatt hours, equivalent to 3788 tons of TNT or 0.2 atomic bombs!) [learn more]
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.
TimeMag. / DepthLocationSource
26 Sep 7:12 pm (GMT -9) (27 Sep 04:12:17 UTC)M 5.6 / 13.8 km127 Km SSW of Nikolski, Alaska, USAUSGS
Sun, 27 Sep 04:12 UTCM 5.7 / 19 kmFox Islands, Aleutian Islands, USAGFZ
Sun, 27 Sep 04:12 UTCM 5.8 / 10 kmFox Islands, Aleutian Islands, USAEMSC
Sun, 27 Sep 04:12 UTCM 5.9 / 40 kmFox Islands, Aleutian Islands, USABMKG
Sun, 27 Sep 04:12 UTCM 5.6 / 35.5 kmFox Islands, Aleutian Islands, USAGeoAu

User reports for this quake (5)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
884.5 km NE of epicenter [Map] / Weak shaking (MMI III) : Wasn't sure if it was an earthquake I felt. Felt table I was leaning on when sitting still next to it, and it did a shaking-vibrating motion for only 2 seconds. Looked back on the history of earthquakes near me that could have been felt to see if it could have been an earthquake that I really experienced, and it said I could have felt this one. The time aligns when I felt the table shake/vibrate. | 3 users found this interesting. (reported through our app)
FULLERTON (4565.4 km E of epicenter) [Map] / not felt
Mississippi / Violent shaking (MMI IX) / vibration and rolling : PLEASE READ!!! I’ve had dreams and visions in Advance that a short time later,PLEASE don’t ignore. I just dreamt today at around 4:00 CST that a very higher Earthquake is coming. It occurs in the daytime after a lull in activity the previous night. It will begin in New Mexico and go down a fault line all the way to San Francisco. It will buckle roadways very VERY badly. The roadways in I believe San Francisco... afterward people were living in campers everywhere. I apologize any inconvenienc | 2 users found this interesting.
Lacey, WA / not felt
Reno nv / not felt

Aftershocks of the 5.6 quake: 127 Km SSW of Nikolski, Alaska, USA, 27 Sep 2020 04:12

More info
Recorded aftershocks, latest first (6 quakes):
  • 10 Oct 2020 06:41 UTC
    | M 4.8 |
    38.3 km (23.8 mi) depth
    7 km (4 mi) distance
    | USGS | Details
  • 29 Sep 2020 01:15 UTC
    | M 4.3 |
    10 km (6.2 mi) depth
    12 km (7 mi) distance
    | EMSC | Details
  • 28 Sep 2020 02:44 UTC
    | M 5.2 |
    10 km (6.2 mi) depth
    10 km (6 mi) distance
    | USGS | Details
  • 27 Sep 2020 10:51 UTC
    | M 4.6 |
    10.6 km (6.6 mi) depth
    7 km (4 mi) distance
    | USGS | Details
  • 27 Sep 2020 08:17 UTC
    | M 4.2 |
    39.4 km (24.5 mi) depth
    19 km (12 mi) distance
    | USGS | Details
  • 27 Sep 2020 06:36 UTC
    | M 4.4 |
    23.5 km (14.6 mi) depth
    16 km (10 mi) distance
    | USGS | Details

Earlier earthquakes in the same area since 1900

Moderate mag. 5.6 earthquake - 127 Km SSW of Nikolski, Alaska, USA on Sunday, 27 September 2020

Map of earlier quakes

More on VolcanoDiscovery

Why is there advertising on this site?

Support us!

Maintaining the website and our free apps is a time- and cost-intensive effort.
If you find the information useful and would like to support our team to develop further features and get the upgraded ad-free version, consider making a donation (PayPal or Online cc payment).
Planned features:
  • Weather reports
  • Tsunami alerts
  • Design upgrades
Thanks to your past donations, these features have been added recently:
  • Earthquake archive back to 1900
  • Additional data sources
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.