M 5.7 in Tonga on 29 Nov 2020 23:56 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: 5.7M
Depth: 10 Km
Lat/Lon: -17.7092 , -174.7997
Event Date: 29 Nov 2020 23:56 UTC
29 Nov 2020 11:56 Local
Exposed Population: Few people within 100km
Source: NEIC us7000cl0j
Inserted at: 30 Nov 2020 04:28 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
us7000cl0j 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
1345553 0 29 Nov 2020 23:56 5.5M, 74.68km 3.29 N/A (in MMI>=VII) 00:18 NEIC
1345558 0 29 Nov 2020 23:56 5.6M, 10km 3.44 N/A (in MMI>=VII) 00:47 NEIC
1345583 0 29 Nov 2020 23:56 5.7M, 10km 3.32 N/A (in MMI>=VII) 04:31 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 1345553 -17.011/-174.732 5.5 74.7 3.286 30 Nov 2020 00:17 00:20 (new episode)
2 0 1345558 -17.753/-174.804 5.6 10.0 3.445 30 Nov 2020 00:55 00:58 (new episode)
3 0 1345558 -17.753/-174.804 5.6 10.0 3.445 30 Nov 2020 02:00 02:03 (upd of #2)
4 0 1345583 -17.709/-174.8 5.7 10.0 3.375 30 Nov 2020 04:30 04:33 (new episode)
5 0 1345583 -17.705/-174.788 5.6 10.0 3.315 30 Nov 2020 19:27 19:30 (upd of #4)
6 0 1345583 -17.705/-174.788 5.6 10.0 3.315 01 Dec 2020 00:00 1d 00:03 (upd of #5)

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.