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Major magnitude 6.6 earthquake - East of South Sandwich Islands on Saturday, 3 April 2021 at 01:16 (GMT) - information

Major magnitude 6.6 earthquake - South Atlantic Ocean on Saturday, Apr 3, 2021 at 12:16 am (GMT -1)

Major magnitude 6.6 earthquake - South Atlantic Ocean on Saturday, Apr 3, 2021 at 12:16 am (GMT -1) Major magnitude 6.6 earthquake - South Atlantic Ocean on Saturday, Apr 3, 2021 at 12:16 am (GMT -1)

Major magnitude 6.6 earthquake at 10 km depth

3 Apr 01:26 UTC: First to report: GFZ after 9 minutes.
3 Apr 01:27: Epicenter location corrected by 3.2 km (2 mi) towards NW.
3 Apr 05:18: Magnitude recalculated from 6.5 to 6.6. Epicenter location corrected by 1.2 km (0.7 mi) towards W.

Earthquake details

Date & timeApr 3, 2021 01:16:40 UTC
Local time at epicenterSaturday, Apr 3, 2021 at 12:16 am (GMT -1)
Depth10.0 km
Epicenter latitude / longitude58.05°S / 7.88°W
Antipode58.05°N / 172.12°E
Shaking intensityVery strong shaking near epicenter
Felt0 reports
Primary data sourceGFZ (German Research Centre for Geosciences)
Nearby towns and cities
Weather at epicenter at time of quakeOvercast Clouds -0.2°C (32 F), humidity: 85%, wind: 14 m/s (27 kts) from SSE
Estimated seismic energy released5 x 1014 joules (139 gigawatt hours, equivalent to 1.2 x 105 tons of TNT or 7.5 atomic bombs!) | about seismic energy
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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.
6.610 kmEast of South Sandwich IslandsGFZ
5.910 kmNear Cape TownRENASS
6.610 kmEast of the South Sandwich IslandsUSGS
6.40.8 kmEast of South Sandwich Islands [Sea]INGV
6.710 kmEast of South Sandwich IslandsGeoAu
6.310 kmEast of South Sandwich IslandsBMKG


Seismic station: Palmer Station, Antarctica (PMSA/IU network) | Distance from quake: 2972 km / 1847 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
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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!
Phoenix, Arizona, United States of America / not felt : I'm glad I didn't feel this quake. It was a pretty strong one. My thoughts and prayers are with anyone and everyone that have been harmed theis quake. | 7 users found this interesting.  
  • BOT SPAM!!!!
  • hope you get harmed soon
  • No one is dumb. We’re all in this together. It’s not a wise idea to reject someone’s prayers for another. Regardless of what you might think, Love Always Wins. Blessings to all from America.
  • It was miles from nowhere! Nobody would have felt this quake, let alone suffered!
  • You're dumb
Wolvega (12401.5 km N of epicenter) [Map] / not felt : I was alarmed by the app. But nothing felt. Living to far from the epicenter. | 3 users found this interesting.  
UK / not felt
Phils / not felt


[More info]

Recorded aftershocks, latest first (2 quakes)

Date and timeMag
Apr 5, 2021 20:31
1 year 36 weeks ago

10 km
South Atlantic OceanMore
Apr 3, 2021 11:11
1 year 36 weeks ago

10 km
South Atlantic OceanMore

Earlier earthquakes in the same area

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