M 5.5 in Tonga Islands Region on 22 Apr 2020 22:31 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: 5.5M
Depth: 40.01 Km
Lat/Lon: -22.081 , -175.4938
Event Date: 22 Apr 2020 22:31 UTC
22 Apr 2020 10:31 Local
Exposed Population: About 7000 people within 100km
Source: NEIC us60009a5h
Inserted at: 23 Apr 2020 22:34 UTC
INFORM Coping capacity of the alert score
4.6 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us60009a5h Scaled population (raster) 0  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 0.94  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1306858 0 22 Apr 2020 22:31 5.5M, 40.04km 3.37 N/A (in MMI>=VII) 00:18 NEIC
1306915 0 22 Apr 2020 22:31 5.5M, 40.01km 3.26 N/A (in MMI>=VII) 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 Tonga , of Tonga (population 98,000) .

Radius Population
100 km 7100 people
75 km no people
50 km no people
20 km no people
10 km no people
5 km no people
2 km no people

Affected Provinces

Region Province Country Population
Tonga Tonga 98000 people

Critical infrastructure

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

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Eua Kaufana EUA unknown 0 96 km
Fua'amotu International TBU 38 Civ. Paved Yes 8700 100 km

Ports

Name LOCODE Country Distance
Ata Island Tonga 78 km
Eua Island Tonga 100 km

More information

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