M 5.7 in Tonga on 20 Aug 2018 00:43 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: 5.7M
Depth: 92.74 Km
Lat/Lon: -16.9028 , -172.5586
Event Date: 20 Aug 2018 00:43 UTC
19 Aug 2018 12:43 Local
Exposed Population: No people within 100km
Source: NEIC us1000gdmg
Inserted at: 20 Aug 2018 01:12 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
us1000gdmg 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
1225010 0 20 Aug 2018 00:43 5.7M, 92.74km 3.4 No people affected (in 100km) 00:28 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 13,729) . The alertlevel for this event is GREEN

Intensity Population


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1225010 -16.903/-172.559 5.7 92.74 3.4 20 Aug 2018 01:12 00:29 (new episode)

Affected Provinces

Intensity Region Province Country Population
Tonga Tonga 14000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Falehau Tonga Village - 163 km
Hihifo Tonga Village <1000 people 164 km
Neiafu Tonga Village 4300 people 245 km

see full list


Critical infrastructure

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

Airports

Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Vavau International VAV 72 Civ. Unpaved Yes 5500 238 km

Ports

Intensity Name LOCODE Country Distance
Neiafu TONEI Tonga 245 km

More information

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