M 4.9 in Tonga on 19 Jan 2022 23:23 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: 10 Km
Lat/Lon: -21.0661 , -175.482
Event Date: 19 Jan 2022 23:23 UTC
20 Jan 2022 12:23 Local
Exposed Population:
80 thousand in 100km
Source: NEIC us7000gdcz
Inserted at: 20 Jan 2022 00:09 UTC
INFORM Coping capacity of the alert score
4.6 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us7000gdcz Scaled population (vector) 5.29  
  C1 earthquake 1  
  C2 earthquake 0  
  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
1422106 0 19 Jan 2022 23:23 4.9M, 10km N/A 80 thousand (in 100km) 00:45 NEIC
1422313 0 19 Jan 2022 23:23 5M, 10km N/A 80 thousand (in 100km) 1d 03:12 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 Foui, Nukunuku, Houma, Pea, Nuku'alofa, Mua, Fuaamotu, Fatumu, Kolonga, Niutoua, and Ohonua.

Radius Population
100 km 83000 people
75 km 83000 people
50 km 78000 people
20 km 4600 people
10 km no people
5 km no people
2 km no people

Affected Provinces

Region Province Country Population
Tonga Tonga 98000 people

Affected populated places

Name Region Province Country City class Population Distance
Foui Tonga Village - 16 km
Nukunuku Tonga Village - 20 km
Houma Tonga Village - 22 km
Pea Tonga Village - 28 km
Nuku'alofa Tonga Capital 24000 people 29 km
Mua Tonga Village - 40 km
Fuaamotu Tonga Village - 42 km
Fatumu Tonga Village - 42 km
Kolonga Tonga Village - 42 km
Niutoua Tonga Village - 47 km
Ohonua Tonga Village 1200 people 63 km

see full list

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
Fua'amotu International TBU 38 Civ. Paved Yes 8700 40 km
Eua Kaufana EUA unknown 0 64 km

Ports

Name LOCODE Country Distance
Nuku'alofa TOTBU Tonga 30 km
Eua Island Tonga 68 km

More information

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