M 7.1 in New Caledonia on 20 May 2023 01:51 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: 7.1M
Depth: 35.981 Km
Event Date: 20 May 2023 01:51 UTC
20 May 2023 12:51 Local
Exposed Population: Few people affected in MMI -
Source: NEIC us6000kdce
Inserted at: 20 May 2023 02:11 UTC
INFORM Coping capacity of the alert score:
1.1 (New Caledonia)
Maximun Wave Height observed: 0.14 m

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0.1 0.1
us6000kdce Scaled population (raster) 0 Max wave alert 0.11m  
  C1 shakemap 0 Max wave realtime 0.14m  
  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
1506560 0.2 20 May 2023 01:51 7.4M, 44.7km N/A Few people (in 100km) 0.2m (at 00:54) 00:08 PTWC
1506561 0.2 20 May 2023 01:51 7.4M, 45km 5.14 Few people (in 100km) 0.2m (at 01:14) 00:09 NTWC
1506563 0.1 20 May 2023 01:51 7.1M, 35.981km 3.96 N/A (in MMI>=VII) 0.1m (at 00:52) 00:20 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.

Estimated Tsunami affected locations

The maximum observed wave height is 0.14m in Ouinne New Caledon;
The maximum Wave height is  0.1m in Mohoun'gha, Vanuatu. This height is estimated for 20-May-2023 02:43:44.

Alert Date (UTC) Name Country Wave height (m)
20-May-2023 02:43:44 Mohoun'gha Vanuatu  0.1
20-May-2023 02:43:44 Ipao Vanuatu  0.1
20-May-2023 03:01:43 Lenakel Vanuatu  0.1
20-May-2023 03:01:43 Isangel Vanuatu  0.1
20-May-2023 03:01:43 Loonelapeun Vanuatu  0.1
20-May-2023 03:01:43 Yerou Vanuatu  0.1
20-May-2023 02:49:32 Waisisi Vanuatu  0.1
20-May-2023 02:45:86 Port Patrick Vanuatu  0.1
20-May-2023 03:02:24 Loanatom Vanuatu  0.1
20-May-2023 02:26:55 Isino Vanuatu  0.1
20-May-2023 02:26:55 Anelghowhat Vanuatu  0.1
20-May-2023 02:47:53 Imwareupo Vanuatu  0.1
20-May-2023 03:05:91 Lownepina Vanuatu  0.1
20-May-2023 02:42:74 White Sands Vanuatu  0.1
20-May-2023 03:01:78 Potnarvin Vanuatu  0.1

See full locations list (RSS)


Initial conditions

Title: ""M 7.1, southeast of the Loyalty Islands""

Fault parameters

  • Latitude: -23.062
  • Longitude: 170.456
  • Length: 56 km
  • Width: 15 km
  • Magnitude: 7.1 M

Okada parameters:

  • Slip: 1.5 m
  • Strike: 300 (geogr angle: north=0, south=180)
  • Dip: 22 degree
  • Rake: 90 degree
  • Depth: 36 km

Calculation parameters

  • Calculation space (lon/lat): 165.956, -27.562, 174.956, -18.562
  • Instead of Step -> use Cell size:.75 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.