M 7.7 in New Caledonia on 19 May 2023 02:57 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: 7.7M
Depth: 18.027 Km
Lat/Lon: -23.1852 , 170.7633
Event Date: 19 May 2023 02:57 UTC
19 May 2023 13:57 Local
Exposed Population: Few people affected in MMI -
Source: NEIC us6000kd0n
Inserted at: 19 May 2023 18:24 UTC
INFORM Coping capacity of the alert score: 1.1 (New Caledonia)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0.6 0.6
us6000kd0n Scaled population (raster) 0 Max wave alert 0.48m  
  C1 shakemap 0 Max wave realtime 0.61m  
  C2 shakemap 0      
  Country Vulnerability 0      
  INFORM_normalised 0      
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
1506319 0.3 19 May 2023 02:57 7.7M, 10km N/A 20 thousand (in 100km) 0.4m (at 00:52) 00:07 PTWC
1506320 0.4 19 May 2023 02:57 7.7M, 10km 5.07 20 thousand (in 100km) 0.4m (at 00:00) 00:07 NTWC
1506325 0.4 19 May 2023 02:57 7.7M, 37.748km 4.21 N/A (in MMI>=VII) 0.5m (at 02:04) 00:19 NEIC
1506482 0.6 19 May 2023 02:57 7.7M, 18.027km 3.89 N/A (in MMI>=VII) 0.6m (at 00:50) 15:27 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
<1000 people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1506325 170.694/-23.229 7.7 37.7 4.214 19 May 2023 03:19 00:22 (new episode)
2 0 1506325 170.694/-23.229 7.7 37.7 4.214 19 May 2023 05:01 02:04 (upd of #1)
3 0 1506482 170.763/-23.185 7.7 18 3.89 19 May 2023 18:40 15:43 (new episode)
4 0 1506482 170.763/-23.185 7.7 18 3.89 20 May 2023 03:40 1d 00:43 (upd of #3)
5 0 1506482 170.763/-23.185 7.7 18 3.89 24 May 2023 23:50 5d 20:53 (upd of #4)

Affected Provinces



Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Ports

Intensity Name LOCODE Country Distance
Matthew Island New Caledonia 111 km
Hunter Island New Caledonia 159 km

More information

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