M 6.3 Off-shore on 31 May 2023 02:21 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: 6.3M
Depth: 9.848 Km
Lat/Lon: -49.6311 , 163.817
Event Date: 31 May 2023 02:21 UTC
31 May 2023 13:21 Local
Exposed Population:
Source: NEIC us7000k54z
Inserted at: 31 May 2023 14:34 UTC
INFORM Coping capacity of the alert score: 1.1 ()


For more info on GDACS alert score click here.
Tsunami GDACS score
NEIC 0 0 0
us7000k54z 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
1508440 0 31 May 2023 02:21 6.2M, 5km 6.88 No people affected (in 100km) 0m (at 00:00) 00:20 NEIC
1508517 0 31 May 2023 02:21 6.3M, 9.848km 3.43 N/A (in MMI>=VII) 0m (at 00:00) 12:13 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
no people

Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1508517 163.836/-49.583 6.3 9.3 3.43 02 Jun 2023 02:40 2d 00:19 (new episode)
2 0 1508517 163.836/-49.583 6.3 9.3 3.43 02 Jun 2023 14:40 2d 12:19 (upd of #1)

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.