M 7.1 in South Georgia and the South Sandwich Islands on 11 Dec 2018 02:26 UTC

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: 7.1M
Depth: 164.66 Km
Lat/Lon: -58.5981 , -26.4656
Event Date: 11 Dec 2018 02:26 UTC
Exposed Population: No people within 100km
Source: NEIC us2000isc8
Inserted at: 11 Dec 2018 02:43 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)
Tsunami GDACS score
NEIC 0 0 0
us2000isc8 Scaled population (vector) 0 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0m  
  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
1240721 0 11 Dec 2018 02:26 7.3M, 176.2km N/A No people affected 0m (at 00:00) 00:12 PTWC
1240723 0 11 Dec 2018 02:26 7.3M, 176km N/A No people affected 0m (at 00:00) 00:14 NTWC    
1240725 0 11 Dec 2018 02:26 7.1M, 164.66km 4.78 No people affected 0m (at 00:00) 00:17 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
* 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 South Georgia and the South Sandwich Islands ,of South Georgia & the South Sandwich Is.. The alertlevel for this event is GREEN

Intensity Population
no people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1240725 -58.598/-26.466 7.1 164.66 4.78 11 Dec 2018 02:45 00:18 (new episode)
2 0 1240725 -58.598/-26.466 7.1 164.66 4.78 11 Dec 2018 04:28 02:02 (upd of #1)

Affected Provinces

Intensity Region Province Country Population
South Georgia & the South Sandwich Is. South Georgia and the South Sandwich Islands no people


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.