Overall Green Earthquake alert in Tonga on 21 Oct 2020 00:22 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 5.9 in Tonga on 21 Oct 2020 00:22 UTC

Hazard models

EQ parameters

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:	5.9M
Depth:	10 Km
Lat/Lon:	-19.3191 , -172.3884
Event Date:	21 Oct 2020 00:22 UTC 20 Oct 2020 13:22 Local
Exposed Population:	No people within 100km
Source:	NEIC us6000cafc
Inserted at:	21 Oct 2020 00:42 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
us6000cafc	Scaled population (raster)	0
	C1 shakemap	-0.59
	C2 shakemap	0.53
	Country Vulnerability	0
	INFORM_normalised	1

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
1338815		0	21 Oct 2020 00:22	5.9M, 10km	3.32	N/A (in MMI>=VII)		00:19	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	1338815	-19.319/-172.388	5.9	10.0	3.321	21 Oct 2020 00:45	00:22	(new episode)
2	1338815	-19.319/-172.388	5.9	10.0	3.321	21 Oct 2020 02:25	02:03	(upd of #1)
3	1338815	-19.319/-172.388	5.9	10.0	3.321	22 Oct 2020 00:26	1d 00:03	(upd of #2)

Affected Provinces

Critical infrastructure

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

More information

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

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