M 5.3 in South Georgia and the South Sandwich Islands on 16 Sep 2021 01:20 UTC

Hazard models

EQ parameters
Shakemap
Tsunami

Event summary

This earthquake is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude: 5.3M
Depth: 10 Km
Lat/Lon: -56.4829 , -36.412
Event Date: 16 Sep 2021 01:20 UTC
15 Sep 2021 23:20 Local
Exposed Population: No people affected in 100km
Source: NEIC us7000fbn4
Inserted at: 16 Sep 2021 23:19 UTC
INFORM Coping capacity of the alert score: 1.1 (South Georgia & the South Sandwich Is.)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us7000fbn4 Scaled population (raster) 0  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 1  
Maximum expected impact using different data sources.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.


Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1396930 0 16 Sep 2021 01:20 5.4M, 12.09km 2.88 No people affected (in 100km) 00:26 NEIC
1397087 0 16 Sep 2021 01:20 5.3M, 10km 2.67 N/A (in MMI>=VII) 21:58 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
The episode that has the last updated information.
* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Exposed population

The earthquake happened in unknowed a zone. The alertlevel for this event is GREEN

Intensity Population


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1396930 -56.391/-36.268 5.4 12.1 2.878 16 Sep 2021 01:49 00:28 (new episode)
2 0 1396930 -56.391/-36.268 5.4 12.1 2.878 16 Sep 2021 02:37 01:16 (upd of #1)
3 0 1397087 -56.391/-36.268 5.4 12.1 2.878 16 Sep 2021 03:24 02:04 (new episode)
4 0 1397087 -56.483/-36.412 5.3 10.0 2.671 16 Sep 2021 23:23 22:02 (upd of #3)
5 0 1397087 -56.483/-36.412 5.3 10.0 2.671 17 Sep 2021 01:25 1d 00:04 (upd of #4)

Affected Provinces



Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.