M 5.4 in Tonga Islands Region on 05 Dec 2020 06:43 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: 5.4M
Depth: 10 Km
Lat/Lon: -18.8829 , -172.7717
Event Date: 05 Dec 2020 06:43 UTC
04 Dec 2020 18:43 Local
Exposed Population: No people within 100km
Source: NEIC us7000cnc9
Inserted at: 05 Dec 2020 14:51 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
us7000cnc9 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

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1346431 0 05 Dec 2020 06:43 5.5M, 10km 3.37 N/A (in MMI>=VII) 00:17 NEIC
1346485 0 05 Dec 2020 06:43 5.4M, 10km 3.22 N/A (in MMI>=VII) 08:08 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

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1346431 -18.871/-172.804 5.5 10.0 3.366 05 Dec 2020 07:02 00:19 (new episode)
2 0 1346431 -18.871/-172.804 5.5 10.0 3.366 05 Dec 2020 08:46 02:02 (upd of #1)
3 0 1346485 -18.883/-172.772 5.4 10.0 3.224 05 Dec 2020 14:54 08:11 (new episode)
4 0 1346485 -18.883/-172.772 5.4 10.0 3.224 05 Dec 2020 19:55 13:12 (upd of #3)
5 0 1346485 -18.883/-172.772 5.4 10.0 3.224 06 Dec 2020 06:46 1d 00:03 (upd of #4)

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.