M 5.8 in Tonga from 21 May 2010 01:05 UTC to 01:05

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: 5.8M
Depth: Km
Lat/Lon: -19.87 , -174
Event Date: 21 May 2010 01:05 UTC
20 May 2010 13:05 Local
Exposed Population:
about 7000 people within 100km
Source: GEOFON
Inserted at: 21 May 2010 01:20 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
GEOFON 0.5 0.5
Scaled population (vector) n.a  
  C1 earthquake n.a  
  C2 earthquake n.a  
  Country Vulnerability n.a  
  INFORM_normalised n.a  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
86935 0.5 21 May 2010 01:05 5.8M, 10km N/A 7 thousand (in 100km) 00:14 GEOFON
86936 0.5 21 May 2010 01:05 5.6M, 10km N/A 6 thousand (in 100km) 00:16 GEOFON
86939 0.5 21 May 2010 01:05 5M, 10km N/A 7 thousand (in 100km) 00:52 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 and Pangai.

Radius Population
100 km 6700 people
75 km 5400 people
50 km 4800 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
Niue Niue 2000 people

Affected populated places

Name Region Province Country City class Population Distance
Pangai Tonga Village 1700 people 38 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
Haapai HPA 12 Civ. Unpaved Yes 3900 37 km

Ports

Name LOCODE Country Distance
Pangai TOPAN Tonga 38 km

More information

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