M 4.9 in Tonga on 17 Sep 2017 20:29 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: 129.26 Km
Lat/Lon: -18.9829 , -174.9501
Event Date: 17 Sep 2017 20:29 UTC
17 Sep 2017 08:29 Local
Exposed Population:
About 500 people within 100km
Source: NEIC us2000apkx
Inserted at: 17 Sep 2017 20:59 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
us2000apkx Scaled population (vector) 1.91  
  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
1180982 0 17 Sep 2017 20:29 4.8M, 151.6km N/A 1 thousand (in 100km) 00:17 NEIC
1180985 0 17 Sep 2017 20:29 4.9M, 129.26km N/A Few people (in 100km) 00:30 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 1300 people
75 km <1000 people
50 km <1000 people
20 km <1000 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.

More information

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