Overall Green Earthquake alert in Tonga Islands Region on 22 Apr 2020 22:31 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 Islands Region on 22 Apr 2020 22:31 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:	5.5M
Depth:	40.01 Km
Lat/Lon:	-22.081 , -175.4938
Event Date:	22 Apr 2020 22:31 UTC 22 Apr 2020 10:31 Local
Exposed Population:	About 7000 people within 100km
Source:	NEIC us60009a5h
Inserted at:	23 Apr 2020 22:34 UTC
INFORM Coping capacity of the alert score:	4.6 (Tonga)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us60009a5h	Scaled population (raster)	0
	C1 shakemap	-0.59
	C2 shakemap	0.53
	Country Vulnerability	0
	INFORM_normalised	0.94

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
1306858		0	22 Apr 2020 22:31	5.5M, 40.04km	3.37	N/A (in MMI>=VII)		00:18	NEIC
1306915		0	22 Apr 2020 22:31	5.5M, 40.01km	3.26	N/A (in MMI>=VII)		1d 00:02	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	1306858	-22.086/-175.381	5.5	40.0	3.243	22 Apr 2020 22:56	00:25	(new episode)
2	1306858	-22.086/-175.381	5.5	40.0	3.37	23 Apr 2020 00:33	02:02	(upd of #1)
3	1306915	-22.081/-175.494	5.5	40.0	3.317	23 Apr 2020 03:42	05:11	(new episode)
4	1306915	-22.081/-175.494	5.5	40.0	3.257	23 Apr 2020 22:34	1d 00:02	(upd of #3)

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.

Disclaimer
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