GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

M 6.1 in Tonga Islands on 08 Oct 2017 14:04 UTC
Tsunami calculation for earthquake Earthquake in Tonga Islands

The JRC has developed a global tsunami wave height calculation model, which is run after each earthquake issued by seismological institutes around the world.

This report is for earthquake episode 1183257 of event 1123340 issued at 08 Oct 2017 14:04 (GDACS Event ID 1123340, Latest episode ID: 1183257, inserted at 08 Oct 2017 14:25 UTC ).


Current impact estimate:

  • Earthquake Magnitude: 6.1M
  • Depth: 10 Km
  • Event Date: 08 Oct 2017 14:04 UTC
  • Exposed Population: Few people within 100km
A pre-calculated grid scenario is also available here
Population density map


Tsunami maximum wave height
Tsunami maximum wave height (Source: JRC)

See animation

Affected locations

No locations affected.

Initial conditions (+)

More information

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

Official tsunami bulletins by regional warning centers can be found at the International Tsunami Information Center.