Contact | RSS | EN | DE | EL | ES | FR | IT | RU

Major magnitude 7.5 earthquake - South Sandwich Islands Region on Thursday, 12 August 2021 at 18:32 (GMT) - information

Major magnitude 7.5 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Aug 12, 2021 at 4:32 pm (GMT -2)

-
This quake was likely a foreshock of the 8.1 quake South Atlantic Ocean, South Georgia & South Sandwich Islands, Aug 12, 2021 4:35 pm (GMT -2), which followed after 2 minutes.
Major magnitude 7.5 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Aug 12, 2021 at 4:32 pm (GMT -2) Major magnitude 7.5 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Aug 12, 2021 at 4:32 pm (GMT -2)

Major magnitude 7.5 earthquake at 63 km depth

12 Aug 18:47 UTC: First to report: USGS after 15 minutes.
12 Aug 18:50: Hypocenter depth recalculated from 77.6 to 78.0 km (from 48 to 48 mi). Epicenter location corrected by 2.7 km (1.7 mi) towards SSW.
12 Aug 19:00: Magnitude recalculated from 7.6 to 7.5. Hypocenter depth recalculated from 78.0 to 63.3 km (from 48 to 39 mi). Epicenter location corrected by 32 km (20 mi) towards SW.

Earthquake details

Date & timeAug 12, 2021 18:32:54 UTC -
Local time at epicenterThursday, Aug 12, 2021 at 4:32 pm (GMT -2)
StatusConfirmed
Magnitude7.5
Depth63.3 km
Epicenter latitude / longitude57.5959°S / 25.1874°W (South Atlantic Ocean, South Georgia & South Sandwich Islands)
Antipode57.596°N / 154.813°E
Shaking intensityStrong shaking near epicenter
Felt4 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoMichael (107 km / 66 mi)
Nearby towns and cities
Weather at epicenter at time of quakeOvercast Clouds -6.8°C (20 F), humidity: 79%, wind: 13 m/s (25 kts) from W
Estimated seismic energy released1.1 x 1016 joules (3117 gigawatt hours, equivalent to 2.7 x 106 tons of TNT or 167.6 atomic bombs!) | about seismic energy
Show interactive Map
[smaller] [bigger]

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.
Mag.DepthLocationSource
7.710 kmSouth Sandwich Islands RegionGFZ
7.560 kmSOUTH SANDWICH ISLANDS REGIONEMSC
7.563 kmSouth Sandwich Islands RegionUSGS
8.010 kmSouth Sandwich Islands RegionGeoAu
6.910 kmNear Mar Del PlataRENASS
8.120 kmSouth Georgia & the South Sandwich Is. [Sea]INGV
7.010 kmSouth Sandwich Islands RegionBMKG
7.565 kmTFAIAS (Argentina)INPRES

Seismograms

Seismic station: Palmer Station, Antarctica (PMSA/IU network) | Distance from quake: 2188 km / 1359 mi | Show on map | Station Info
Seismic station Palmer Station, Antarctica: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

User reports for this quake (23)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
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!
Translate
Caraguatatuba (4112.4 km NNW of epicenter) [Map] / Very weak shaking (MMI II) : Deu uma tontura muito grande | 7 users found this interesting. (reported through our app)  
Rio Gallegos, Departamento de Güer Aike, Santa Cruz (2858.7 km W of epicenter) [Map] / Very weak shaking (MMI II) / very short : Vibro el piso de mi casa por un instante, lo sentí claramente | 4 users found this interesting. (reported through our app)  
Derry / not felt : I felt fear | 4 users found this interesting.  
PORTO ALEGRE (3656.9 km NW of epicenter) [Map] / not felt : Nada anormal | 3 users found this interesting. (reported through our app)  
Derry / not felt : I felt fear | 2 users found this interesting.  
Curitiba, PR Brasil (4059.6 km NW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Acho que senti esse. Foi muito breve, senti nos pés uma rápida e leve vibração com um pequeno som (rumbling). Foi tão rápido e sutil que fiquei em dúvida na hora, mas agora vendo o registro do tremor acho que pode ter sido verdadeiro o que senti. N | One user found this interesting. (reported through our app)  
Nilópolis, Rio de Janeiro, Brasil (4137.3 km NNW of epicenter) [Map] / not felt : Não senti, mas sei que foi muito forte! To de olho nos Vulcões de lá, incluindo o Monte Michael. | One user found this interesting. (reported through our app)  
Campinas, São Paulo (4245.7 km NW of epicenter) [Map] / not felt (reported through our app)
Caraguatatuba (4112.4 km NNW of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Marica, Rio de Janeiro (4104 km NNW of epicenter) [Map] / not felt (reported through our app)
Irati (4100.7 km NW of epicenter) [Map] / not felt (reported through our app)
30 km of Joinville, Santa Catarina (3976.4 km NW of epicenter) [Map] / not felt (reported through our app)
Muriaé (4290.1 km NNW of epicenter) [Map] / not felt (reported through our app)
Itaquaquecetuba, São Paulo (4151.8 km NW of epicenter) [Map] / not felt (reported through our app)
near Santa Rita do Passa Quatro, São Paulo (4365.2 km NW of epicenter) [Map] / not felt (reported through our app)
Pato Bragado (4266.3 km NW of epicenter) [Map] / not felt (reported through our app)
Uruguay (3414.6 km NW of epicenter) [Map] / not felt
Russell, Iowa / not felt
Falkland Islands / not felt
Cape town (4171.7 km ENE of epicenter) [Map] / not felt
Požega / not felt
Uruguay artigas (3858.2 km NW of epicenter) [Map] / not felt (reported through our app)
Welling, Oklahoma / not felt
Show more

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version

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:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Design upgrade
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Sources: VolcanoDiscovery / VolcanoAdventures and other sources as noted.
Use of material: Most text and images on our websites are owned by us. Re-use is generally not permitted without authorization. Contact us for licensing rights.
Volcanoes & Earthquakes
VolcanoDiscovery Home
Volcanoes | Earthquakes | Photos | Volcano News | App
Adventure & Study Travel
Tours to Volcanoes and Volcanic Areas: walking tours, photo tours, study tours
Tours & Dates | FAQ | About us
Get our newsletter!
Company info
Contact | Legal info | Terms & conditions
Follow us
Follow us on facebook Follow us on Instagram Follow us on Twitter Visit our Youtube channel
EN | DE | EL | ES | FR | IT | RU
VolcanoDiscovery GmbH, Germany, Reg. nr.: HRB 103744, EU Tax Id: DE 310 395 322 owned and created by
Dr. Tom Pfeiffer, volcanologist, volcano photographer, tour organizer member of
IAVCEI
Volcanological Society
Ecotourism Greece
Insured by R+V
VolcanoDiscovery © 2004- All Rights Reserved | Privacy - cookie settings