Overall Green Earthquake in Tonga on 30 Mar 2025 12:18 UTC

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

M 7 in Tonga on 30 Mar 2025 12:18 UTC

2025-03-30 13:25 message from NTWC

Key information extracted from original GTS message :

Evaluation

An earthquake with a preliminary magnitude of 7.1 occurred in the TONGA ISLANDS at 1219 UTC on sunday MARCH 30 2025
Based on all available data the TSUNAMI threat from this earthquake has now passed

Tsunami Observations

The following are tsunami wave observations from coastal and/or deep-ocean sea level gauges at the indicated locations the maximum tsunami height is measured with respect to the normal tide level

GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
Nukualofa To	-21.1	-175.2	12: 58	0.01	06
Alofi Nu	-19.1	-169.9	12: 54	0.05	06

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
PTWC	Nukualofa To	-21.1	-175.2	12: 58	0.01	06
PTWC	Alofi Nu	-19.1	-169.9	12: 54	0.05	06

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.