M 5.5 in South Georgia and the South Sandwich Islands on 11 Sep 2021 09:23 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: 5.5M
Depth: 56.07 Km
Lat/Lon: -59.6406 , -26.4133
Event Date: 11 Sep 2021 09:23 UTC
11 Sep 2021 07:23 Local
Exposed Population: No people affected in 100km
Source: NEIC us7000fa9j
Inserted at: 11 Sep 2021 09:45 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
us7000fa9j 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
1396404 0 11 Sep 2021 09:23 5.5M, 56.07km 3.77 No people affected (in 100km) 00:22 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 1396404 -59.641/-26.413 5.5 56.1 3.769 11 Sep 2021 09:47 00:24 (new episode)
2 0 1396404 -59.641/-26.413 5.5 56.1 3.769 11 Sep 2021 11:29 02:06 (upd of #1)
3 0 1396404 -59.641/-26.413 5.5 56.1 3.769 12 Sep 2021 09:26 1d 00:03 (upd of #2)
4 0 1396404 -59.633/-26.418 5.5 56.5 3.773 14 Sep 2021 17:12 3d 07:49 (upd of #3)
5 0 1396404 -59.633/-26.418 5.5 56.5 3.773 14 Sep 2021 18:15 3d 08:52 (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.