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 13:06 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
TSUNAMI waves have been observed
Based on all available data hazardous TSUNAMI waves are forecast for some coasts

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)
Alofi Nu	-19.1	-169.9	12: 51	0.04	06

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
PTWC	Alofi Nu	-19.1	-169.9	12: 51	0.04	06

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