M 5.8 in Tonga on 09 Sep 2021 04:59 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: 5.8M
Depth: 10 Km
Lat/Lon: -19.2552 , -176.4147
Event Date: 09 Sep 2021 04:59 UTC
08 Sep 2021 16:59 Local
Exposed Population: No people affected in 100km
Source: NEIC us7000f9l5
Inserted at: 13 Sep 2021 07:19 UTC
INFORM Coping capacity of the alert score: 1.1 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us7000f9l5 Scaled population (vector) 0  
  C1 earthquake 1  
  C2 earthquake 0  
  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
1396021 0 09 Sep 2021 04:59 5.8M, 10km 3.41 N/A (in MMI>=VII) 00:24 NEIC
1396472 0 09 Sep 2021 04:59 5.8M, 10km 3.41 No people affected (in 100km) 4d 02:19 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

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1396021 -19.146/-176.45 5.8 10.0 3.361 09 Sep 2021 05:26 00:26 (new episode)
2 0 1396021 -19.146/-176.45 5.8 10.0 3.361 09 Sep 2021 07:04 02:04 (upd of #1)
3 0 1396021 -19.146/-176.45 5.8 10.0 3.361 10 Sep 2021 05:03 1d 00:03 (upd of #2)
4 0 1396021 -19.255/-176.415 5.8 10.0 3.414 13 Sep 2021 02:22 3d 21:22 (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.