M 6.5 in New Caledonia on 20 May 2023 02:09 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: 6.5M
Depth: 10 Km
Event Date: 20 May 2023 02:09 UTC
20 May 2023 13:09 Local
Exposed Population: Few people affected in MMI -
Source: NEIC us6000kdcu
Inserted at: 20 May 2023 02:46 UTC
INFORM Coping capacity of the alert score:
1.1 (New Caledonia)


For more info on GDACS alert score click here.
Tsunami GDACS score
NEIC 0 0 0
us6000kdcu Scaled population (raster) 0 Max wave alert 0m  
  C1 shakemap 0 Max wave realtime 0m  
  C2 shakemap 0      
  Country Vulnerability 0      
  INFORM_normalised 0      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1506579 0 20 May 2023 02:09 6.5M, 28.117km N/A N/A (in MMI>=VII) 0m (at 00:00) 00:18 NEIC
1506586 0 20 May 2023 02:09 6.5M, 10km N/A N/A (in MMI>=VII) 0m (at 00:00) 00:36 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.

Tsunami affected locations

Alert Date (UTC) Name Country Wave height (m)

See full locations list (RSS)

Initial conditions

Title: ""southeast of the Loyalty Islands""

Fault parameters

  • Latitude: -22.954
  • Longitude: 170.478
  • Length: 28 km
  • Width: 7 km
  • Magnitude: 6.5 M

Okada parameters:

  • Slip: .8 m
  • Strike: 300 (geogr angle: north=0, south=180)
  • Dip: 22 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): 168.978, -24.454, 171.978, -21.454
  • Instead of Step -> use Cell size:.25 minutes

Sea Level

More information

  • Timeline:
    Tsunami calculations performed to this case, click here

  • Montecarlo:
    Tsunami Montecarlo simulation performed to this case, click here

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