M 7.4 in New Caledonia from 20 May 2023 01:51 UTC to 01:51

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: 7.4M
Depth: 44.7 Km
Event Date: 20 May 2023 01:51 UTC
20 May 2023 12:51 Local
Exposed Population: Few people affected in MMI -
Source: PTWC pt23140000
Inserted at: 20 May 2023 01:59 UTC
INFORM Coping capacity of the alert score:
1.1 (New Caledonia)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Rapid Impact)		 Tsunami GDACS score
PTWC 0 0.2 0.2
pt23140000 Scaled population (vector) 0 Max wave alert 0.23m  
  C1 rapid impact 0 Max wave realtime 0.23m  
  C2 rapid impact 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.

Tsunami affected locations

The maximum Wave height is  0.2m in Port Patrick, Vanuatu. This height is estimated for 20-May-2023 02:45:61.

Alert Date (UTC) Name Country Wave height (m)
20-May-2023 02:45:61 Port Patrick Vanuatu  0.2
20-May-2023 03:03:35 Loanatom Vanuatu  0.2
20-May-2023 03:03:35 Lenakel Vanuatu  0.2
20-May-2023 03:03:35 Isangel Vanuatu  0.2
20-May-2023 03:03:35 Loonelapeun Vanuatu  0.2
20-May-2023 03:43:17 Mele Vanuatu  0.1
20-May-2023 03:02:65 Potnarvin Vanuatu  0.1
20-May-2023 04:00:56 Nul Vanuatu  0.1
20-May-2023 04:00:56 Filakara Vanuatu  0.1
20-May-2023 04:16:26 Kingston Norfolk Island  0.1
20-May-2023 02:30:41 Anelghowhat Vanuatu  0.1
20-May-2023 02:47:61 Lownepina Vanuatu  0.1
20-May-2023 04:43:67 Eratap Vanuatu  0.1
20-May-2023 03:58:25 Vaoleli Vanuatu  0.1
20-May-2023 03:58:25 Tafouale Vanuatu  0.1
20-May-2023 03:58:25 Ignal Vanuatu  0.1
20-May-2023 02:27:64 Umetch Vanuatu  0.1
20-May-2023 04:19:45 Port-Vila Vanuatu  0.1
20-May-2023 04:19:45 Vanuatu Vanuatu  0.1
20-May-2023 03:13:86 Epuen Vanuatu  0.1
20-May-2023 02:48:75 Menaku New Caledonia  0.1
20-May-2023 02:48:75 Hnadid New Caledonia  0.1
20-May-2023 02:42:95 White Sands Vanuatu  0.1
20-May-2023 03:09:31 Waisisi Vanuatu  0.1
20-May-2023 03:28:07 Lambukuti Vanuatu  0.1
20-May-2023 03:28:07 Moeriou Vanuatu  0.1
20-May-2023 03:28:07 Mangarisu Vanuatu  0.1
20-May-2023 03:55:07 Leiwoma Vanuatu  0.1
20-May-2023 02:36:88 Mohoun'gha Vanuatu  0.1
20-May-2023 02:36:88 Ipao Vanuatu  0.1
20-May-2023 02:56:37 Ombous Vanuatu  0.1
20-May-2023 02:56:37 Ireupuow Vanuatu  0.1
20-May-2023 02:41:52 Isavai Vanuatu  0.1
20-May-2023 03:41:12 Natapao Vanuatu  0.1
20-May-2023 04:18:36 Erakor Vanuatu  0.1
20-May-2023 04:18:36 Nanguile Vanuatu  0.1
20-May-2023 03:42:84 Matao Tiupeniu Vanuatu  0.1
20-May-2023 03:48:55 Forari Vanuatu  0.1
20-May-2023 03:14:35 Ebao Vanuatu  0.1
20-May-2023 03:22:52 Cuvu Fiji  0.1
20-May-2023 03:23:05 Mbatiri Fiji  0.1
20-May-2023 03:23:05 Sigatoka Fiji  0.1
20-May-2023 03:23:05 Laselase Fiji  0.1
20-May-2023 03:46:07 Leman Vanuatu  0.1
20-May-2023 03:46:07 Mate Vanuatu  0.1
20-May-2023 04:03:91 Halos Vanuatu  0.1
20-May-2023 04:54:52 Pawe Vanuatu  0.1
20-May-2023 02:26:25 Isino Vanuatu  0.1
20-May-2023 02:58:45 Yerou Vanuatu  0.1
20-May-2023 03:05:94 Loounemeloupang Vanuatu  0.1
20-May-2023 03:53:77 Emua Vanuatu  0.1
20-May-2023 03:53:77 Laonomoa Vanuatu  0.1
20-May-2023 04:29:25 Onesoua Vanuatu  0.1
20-May-2023 02:21:33 Kurine New Caledonia  0.1
20-May-2023 02:49:94 Ifo Vanuatu  0.1
20-May-2023 03:25:93 Happy Land Vanuatu  0.1
20-May-2023 03:26:66 Umpon Mompu Vanuatu  0.1
20-May-2023 03:26:29 Yawisaghuwi Vanuatu  0.1
20-May-2023 03:55:07 Nekapa Vanuatu  0.1
20-May-2023 04:09:56 Peskarus Vanuatu  0.1
20-May-2023 03:20:86 Marow Vanuatu  0.1
20-May-2023 03:48:14 Kouroumanpe Vanuatu  0.1
20-May-2023 03:45:73 Lulep Nesa Vanuatu  0.1
20-May-2023 03:38:57 Tavua Fiji  0.1
20-May-2023 03:40:45 Wegnec St-Joseph New Caledonia  0.1
20-May-2023 03:40:45 Ognat New Caledonia  0.1
20-May-2023 03:43:85 Epantgouei Vanuatu  0.1
20-May-2023 03:44:03 Boloa Vanuatu  0.1
20-May-2023 03:44:03 Makatea Vanuatu  0.1
20-May-2023 03:17:45 Malakof Vanuatu  0.1
20-May-2023 03:26:29 Korolevu Fiji  0.1
20-May-2023 03:25:93 Nikaura Vanuatu  0.1
20-May-2023 03:25:93 Tavio Vanuatu  0.1

See full locations list (RSS)


Initial conditions

Title: ""southeast of the Loyalty Islands""

Fault parameters

  • Latitude: -23.105
  • Longitude: 170.402
  • Length: 79 km
  • Width: 22 km
  • Magnitude: 7.4 M

Okada parameters:

  • Slip: 2 m
  • Strike: 300 (geogr angle: north=0, south=180)
  • Dip: 22 degree
  • Rake: 90 degree
  • Depth: 45 km

Calculation parameters

  • Calculation space (lon/lat): 162.902, -30.605, 177.902, -15.605
  • Instead of Step -> use Cell size:1.25 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.