Overall Green Earthquake alert in Tonga on 31 Jan 2024 10:49 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 5.8 in Tonga on 31 Jan 2024 10:49 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:	5.8M
Depth:	185.5 Km
Lat/Lon:	-22.8316 , -177.1381
Event Date:	31 Jan 2024 10:49 UTC 30 Jan 2024 22:49 Local
Exposed Population:
Source:	NEIC us7000lv7d
Inserted at:	31 Jan 2024 11:05 UTC
INFORM Coping capacity of the alert score:	1.1 (Tonga)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us7000lv7d	Scaled population (raster)	0
	C1 shakemap	0
	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	Alert	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1550268		0	31 Jan 2024 10:49	5.8M, 185.5km	2.97	N/A (in MMI>=VII)		00:15	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
	no people

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1550268	-177.138/-22.832	5.8	185.5	3.144	31 Jan 2024 11:08	00:19	(new episode)
2	1550268	-177.138/-22.832	5.8	185.5	2.966	31 Jan 2024 11:12	00:22	(upd of #1)
3	1550268	-177.138/-22.832	5.8	185.5	2.966	31 Jan 2024 12:52	02:03	(upd of #2)
4	1550268	-177.138/-22.832	5.8	185.5	2.966	01 Feb 2024 14:43	1d 03:53	(upd of #3)

Affected Provinces

Critical infrastructure

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

Ports

Intensity	Name	LOCODE	Country	Distance
	Ata Island		Tonga	111 km

More information

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

Disclaimer
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