M 5.7 in Tonga on 05 Aug 2019 09:01 UTC

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: -19.3534 , -174.8786
Event Date: 05 Aug 2019 09:01 UTC
04 Aug 2019 21:01 Local
Exposed Population: About 5000 people within 100km
Source: NEIC us600050rn
Inserted at: 06 Aug 2019 09:04 UTC
INFORM Coping capacity of the alert score: 1.1 (Tonga)


For more info on GDACS alert score click here.
GDACS score
NEIC 0 0
us600050rn 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
1268343 0 05 Aug 2019 09:01 5.7M, 10km 4.1 6 thousand 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
<1000 people
no people

Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1268343 -19.353/-174.879 5.7 10.0 4.096 05 Aug 2019 09:31 00:30 (new episode)
2 0 1268343 -19.353/-174.879 5.7 10.0 4.096 05 Aug 2019 11:04 02:02 (upd of #1)
3 0 1268343 -19.353/-174.879 5.7 10.0 4.096 06 Aug 2019 09:04 1d 00:02 (upd of #2)

Affected Provinces

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Pangai Tonga Village5 1700 people 75 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.


Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Haapai HPA 12 Civ. Unpaved Yes 3900


Intensity Name LOCODE Country
Pangai TOPAN Tonga

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.