M 4.9 in Tonga on 24 Apr 2017 22:18 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: 4.9M
Depth: 55.22 Km
Lat/Lon: -16.1245 , -173.6514
Event Date: 24 Apr 2017 22:18 UTC
25 Apr 2017 11:18 Local
Exposed Population:
About 1000 people within 100km
Source: NEIC us10008kdl
Inserted at: 24 Apr 2017 22:42 UTC
INFORM Coping capacity of the alert score
1.1 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us10008kdl Scaled population (vector) 0  
  C1 earthquake 1  
  C2 earthquake 0  
  Country Vulnerability 0  
  INFORM_normalised 1  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1165157 0 24 Apr 2017 22:18 4.9M, 55.22km N/A 1 thousand (in 100km) 00:23 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 nearest places are Hihifo, and Falehau.

Radius Population
100 km 1100 people
75 km 1100 people
50 km 1100 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
Samoa Samoa 160000 people
American Samoa American Samoa 53000 people
Wallis & Futuna Wallis and Futuna 14000 people

Affected populated places

Name Region Province Country City class Population Distance
Hihifo Tonga Village <1000 people 20 km
Falehau Tonga Village - 21 km

see full list

Critical infrastructure

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

More information

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