Overall Green Earthquake in Tonga on 19 Apr 2026 17:34 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 6.1 in Tonga on 19 Apr 2026 17:34 UTC

Global Telecommunication Service

GTS (Global Telecommunication Service) is the official Warning and Alerting channel by the World Meteorological Organization (WMO) adopted by several Warning Organizations. As soon as a new GTS message regarding Tropical Cyclones(WT) or Tsunami(WE) the messages are processed and possibly assigned to the specific event. When a new GTS message is present an new tab in the specific event report page is present.The presence of a GTS message is shown in the homepage with a dedicated icon.

Click on the messages list to visualize on the right the detailed text.

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)

19/04 17:42 WEZS42PHEB191740

2026-04-19 17:42 message from NTWC link

Key information extracted from original GTS message :

Evaluation

An earthquake with a preliminary magnitude of 6.1 occurred about 101 miles southwest of savaii ISLAND at 635 am sst on sunday APRIL 19 2026
Based on all available data there is no TSUNAMI threat to AMERICAN SAMOA from this earthquake
Some areas MAY have experienced very strong shaking

Original Message :

WEZS42 PHEB 191740
TIBPPG

ASZ001>004-191940-

TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER HONOLULU HI
640 AM SST SUN APR 19 2026

...NO TSUNAMI THREAT FROM A NEARBY EARTHQUAKE...

AUDIENCE
--------
EMERGENCY MANAGERS... MEDIA... GENERAL PUBLIC

EVALUATION
----------

* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.1 OCCURRED
ABOUT 101 MILES SOUTHWEST OF SAVAII ISLAND AT 635 AM SST ON
SUNDAY APRIL 19 2026.

* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT TO
AMERICAN SAMOA FROM THIS EARTHQUAKE.

* SOME AREAS MAY HAVE EXPERIENCED VERY STRONG SHAKING.

RECOMMENDED ACTIONS
-------------------

* BE OBSERVANT AND EXERCISE NORMAL CAUTION IF YOU ARE NEAR OR
IN THE OCEAN. OTHERWISE... NO ACTION IS REQUIRED.

POTENTIAL IMPACTS
-----------------

* NO TSUNAMI IMPACTS ARE EXPECTED.

PRELIMINARY EARTHQUAKE PARAMETERS
---------------------------------

* MAGNITUDE 6.1
* ORIGIN TIME 635 AM SST APR 19 2026
* COORDINATES 15.1 SOUTH 173.1 WEST
* DEPTH 6 MILES
* LOCATION ABOUT 101 MILES SOUTHWEST OF SAVAII ISLAND

NEXT UPDATE AND ADDITIONAL INFORMATION
--------------------------------------

* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.

* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
INTERNET AT WWW.TSUNAMI.GOV.

* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.

$$

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.