M 5.9 in Tonga on 05 Sep 2021 17:51 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: -22.0299 , -174.5462
Event Date: 05 Sep 2021 17:51 UTC
05 Sep 2021 05:51 Local
Exposed Population: 5 thousand in 100km
Source: NEIC us7000f8bb
Inserted at: 05 Sep 2021 20:06 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
us7000f8bb 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
1395464 0 05 Sep 2021 17:51 5.9M, 10km 3.57 N/A (in MMI>=VII) 00:18 NEIC
1395471 0 05 Sep 2021 17:51 5.9M, 10km 3.76 N/A (in MMI>=VII) 02:14 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 1395464 -22.09/-174.166 5.9 10.0 3.567 05 Sep 2021 18:08 00:16 (new episode)
2 0 1395471 -22.09/-174.166 5.9 10.0 3.567 05 Sep 2021 19:54 02:03 (new episode)
3 0 1395471 -22.03/-174.546 5.9 10.0 3.757 05 Sep 2021 20:36 02:44 (upd of #2)
4 0 1395471 -22.03/-174.546 5.9 10.0 3.757 06 Sep 2021 17:56 1d 00:04 (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.