Overall Green Earthquake alert in New Caledonia on 20 May 2023 01:51 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

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
Lat/Lon:	-23.0622 , 170.4562
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)

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.

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

ID	Score	Date	Mag, Depth	MMI*	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.

Exposed population

The earthquake happened in unknowed a zone. The alertlevel for this event is GREEN

Intensity	Population
	<1000 people

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1506563	170.456/-23.062	7.1	36	3.966	20 May 2023 02:18	00:27	(new episode)
2	1506563	170.456/-23.062	7.1	36	3.966	20 May 2023 03:57	02:06	(upd of #1)
3	1506563	170.456/-23.062	7.1	36	3.966	21 May 2023 02:40	1d 00:49	(upd of #2)
4	1506563	170.456/-23.062	7.1	36	3.966	23 May 2023 22:40	3d 20:49	(upd of #3)
5	1506563	170.456/-23.062	7.1	36	3.965	23 May 2023 23:51	3d 22:00	(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	121 km
	Hunter Island		New Caledonia	180 km

More information

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

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
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