M 5.4 Off-shore on 23 Apr 2023 23:39 UTC

Hazard models

Rapid Impact
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: 5.4M
Depth: 75.849 Km
Lat/Lon: -59.5435 , -26.4463
Event Date: 23 Apr 2023 23:39 UTC
23 Apr 2023 21:39 Local
Exposed Population:
Source: NEIC us6000k6m6
Inserted at: 25 Apr 2023 02:42 UTC
INFORM Coping capacity of the alert score: 1.1 ()

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us6000k6m6 Scaled population (vector) 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
1502040 0 23 Apr 2023 23:39 5.4M, 108.91km 3.8 No people affected (in 100km) 00:23 NEIC
1502235 0 23 Apr 2023 23:39 5.4M, 75.849km 3.86 No people affected (in 100km) 1d 03:03 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 South Georgia and the South Sandwich Islands ,of South Georgia & the South Sandwich Is.. The alertlevel for this event is GREEN

Intensity Population


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1502040 -26.505/-59.558 5.4 108.9 3.798 24 Apr 2023 00:07 00:28 (new episode)
2 0 1502040 -26.505/-59.558 5.4 108.9 3.798 24 Apr 2023 01:43 02:04 (upd of #1)
3 0 1502040 -26.505/-59.558 5.4 108.9 3.798 24 Apr 2023 23:51 1d 00:11 (upd of #2)
4 0 1502235 -26.446/-59.544 5.4 75.8 3.859 25 Apr 2023 03:40 1d 04:00 (new episode)

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.