M 5.6 in Tonga on 13 May 2018 05:50 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: 5.6M
Depth: 10 Km
Lat/Lon: -21.1634 , -173.874
Event Date: 13 May 2018 05:50 UTC
12 May 2018 17:50 Local
Exposed Population: About 1000 people in MMI>=IV
No people within 100km
Source: NEIC us1000e3zd
Inserted at: 13 May 2018 06:15 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
us1000e3zd Scaled population (vector) 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
1210359 0 13 May 2018 05:50 5.6M, 10km 3.53 No people affected 00:24 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 Tonga ,of Tonga (population 98,000) . The alertlevel for this event is GREEN

Intensity Population
no people
<1000 people

Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1210359 -21.163/-173.874 5.6 10 3.22 13 May 2018 06:18 00:28 (new episode)
2 0 1210359 -21.163/-173.874 5.6 10 3.53 13 May 2018 07:55 02:05 (upd of #1)

Affected Provinces

Intensity Region Province Country Population
Tonga Tonga 36000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Ohonua Tonga Village 1200 people 113 km
Niutoua Tonga Village - 121 km
Kolonga Tonga Village - 125 km
Fatumu Tonga Village - 129 km
Mua Tonga Village - 129 km
Fuaamotu Tonga Village - 132 km
Nuku'alofa Tonga Capital 24000 people 139 km
Pea Tonga Village - 141 km
Houma Tonga Village - 148 km
Nukunuku Tonga Village - 148 km
Foui Tonga Village - 152 km
Pangai Tonga Village 1700 people 157 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)
Eua Kaufana EUA unknown 0
Fua'amotu International TBU 38 Civ. Paved Yes 8700
Haapai HPA 12 Civ. Unpaved Yes 3900


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

More information

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