M 6.2 in Tonga on 10 Nov 2018 08:33 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: 6.2M
Depth: 10 Km
Lat/Lon: -20.5351 , -173.8191
Event Date: 10 Nov 2018 08:33 UTC
Exposed Population: About 3000 people within 100km
Source: NEIC us1000hq85
Inserted at: 10 Nov 2018 08:51 UTC
INFORM Coping capacity of the alert score: 1.1 (Tonga)


For more info on GDACS alert score click here.
Tsunami GDACS score
NEIC 0 0.1 0.1
us1000hq85 Scaled population 0 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0.06m  
  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
1236236 0 10 Nov 2018 08:33 6.2M, 10km 4.1 4 thousand 0.1m (at 00:13) 00:18 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
* 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 Tonga ,of Tonga (population 98,000) . 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 1236236 -20.535/-173.819 6.2 10 3.89 10 Nov 2018 08:52 00:19 (new episode)
2 0 1236236 -20.535/-173.819 6.2 10 4.1 10 Nov 2018 10:35 02:02 (upd of #1)

Affected Provinces

Intensity Region Province Country Population
Tonga Tonga 33000 people
Tonga Tonga 16000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Pangai Tonga Village5 1700 people 97 km
Niutoua Tonga Village5 - 145 km
Kolonga Tonga Village5 - 148 km
Mua Tonga Village5 - 153 km
Fatumu Tonga Village5 - 154 km
Fuaamotu Tonga Village5 - 159 km
Nuku'alofa Tonga Capital 24000 people 160 km
Pea Tonga Village5 - 163 km
Nukunuku Tonga Village5 - 168 km
Houma Tonga Village5 - 169 km
Ohonua Tonga Village5 1200 people 148 km
Foui Tonga Village5 - 171 km
Neiafu Tonga Village5 4200 people 209 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
Fua'amotu International TBU 38 Civ. Paved Yes 8700
Eua Kaufana EUA unknown 0
Vavau International VAV 72 Civ. Unpaved Yes 5500


Intensity Name LOCODE Country
Pangai TOPAN Tonga
Nuku'alofa TOTBU Tonga
Eua Island Tonga
Neiafu TONEI Tonga
Ata Island Tonga

More information

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