M 5.4 Off-shore on 25 Aug 2002 04:42 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: 5.4M
Depth: 553.1 Km
Lat/Lon: -20.46 , -178.46
Event Date: 25 Aug 2002 04:42 UTC
Exposed Population:
Source: NEIC
Inserted at: 01 Jan 1900 00:00 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 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
161 0.5 25 Aug 2002 04:42 5.4M, 553.1km N/A No people affected (in 100km) -04:-42 NEIC
186 0.5 25 Aug 2002 04:41 5.4M, 0km N/A No people affected (in 100km) -04:-41 RENASS
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 1700 people
75 km 1700 people
50 km 1500 people
20 km no people
10 km no people
5 km no people
2 km no people

Affected Provinces

Country Region Province Population
Tonga Tonga 98000 people
Fiji Fiji 760000 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
Ono-I-Lau ONU unknown 34 km

More information

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