Overall Green Earthquake alert in Tonga on 31 Mar 2024 03:01 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 5.5 in Tonga on 31 Mar 2024 03:01 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:	5.5M
Depth:	10 Km
Lat/Lon:	-19.9153 , -175.9723
Event Date:	31 Mar 2024 03:01 UTC 30 Mar 2024 15:01 Local
Exposed Population:	Few people affected in MMI&>=III
Source:	NEIC us7000m90u
Inserted at:	31 Mar 2024 03:22 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
us7000m90u	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
1562107		0	31 Mar 2024 03:01	5.5M, 10km	3.8	N/A (in MMI>=VII)		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 Tonga ,of Tonga (population 20,058) . 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	1562107	-175.972/-19.915	5.5	10	3.689	31 Mar 2024 03:25	00:23	(new episode)
2	1562107	-175.972/-19.915	5.5	10	3.689	31 Mar 2024 03:45	00:43	(upd of #1)
3	1562107	-175.972/-19.915	5.5	10	3.689	31 Mar 2024 05:05	02:04	(upd of #2)
4	1562107	-175.972/-19.915	5.5	10	3.689	01 Apr 2024 03:40	1d 00:39	(upd of #3)

Affected Provinces

Intensity	Region Province	Country	Population
	Tonga	Tonga	20000 people

Affected populated places. Areas of interest

Name	Country	City class	Population	Distance
Foui	Tonga	Village	-	148 km
Nukunuku	Tonga	Village	-	152 km
Houma	Tonga	Village	-	156 km
Nuku'alofa	Tonga	Capital	24000 people	156 km
Kolonga	Tonga	Village	-	164 km
Mua	Tonga	Village	-	166 km
Niutoua	Tonga	Village	-	168 km
Fatumu	Tonga	Village	-	169 km
Pangai	Tonga	Village	1700 people	170 km

see full list

Critical infrastructure

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

Airports

Intensity	Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)	Distance
	Fua'amotu International	TBU	38	Civ.	Paved	Yes	8700	171 km
	Haapai	HPA	12	Civ.	Unpaved	Yes	3900	172 km

Ports

Intensity	Name	LOCODE	Country	Distance
	Nuku'alofa	TOTBU	Tonga	157 km
	Pangai	TOPAN	Tonga	170 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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