Overall Green Earthquake alert in New Caledonia on 19 May 2023 02:57 UTC

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 7.7 in New Caledonia on 19 May 2023 02:57 UTC

2023-05-19 03:42 message from NTWC

Key information extracted from original GTS message :

Evaluation

An earthquake with a preliminary magnitude of 7.8 occurred southeast of the loyalty ISLANDS at 0257 UTC on friday MAY 19 2023
Based on all available data hazardous TSUNAMI waves are forecast for some coasts

Threat Forecast

TSUNAMI waves reaching 1 to 3 meters above the tide level are possible along some coasts of vanuatu.
TSUNAMI waves reaching 0.3 to 1 meters above the tide level are possible for some coasts of NEW caledonia... fiji... kiribati... and NEW zealand.
TSUNAMI waves are forecast to be less than 0.3 meters above the tide level for the coasts of AMERICAN samoa... australia... chuuk... COOK islands... FRENCH polynesia... guam... howland and baker... indonesia... JARVIS island... johnston atoll... kermadec islands... kosrae... MARSHALL islands... nauru... niue... NORTHERN marianas... palmyra island... PAPUA NEW guinea... pohnpei... samoa... SOLOMON islands... tokelau... tonga... tuvalu... and WALLIS and futuna.
Actual amplitudes at the coast MAY vary from forecast amplitudes due to uncertainties in the forecast and local features. in particular maximum TSUNAMI amplitudes on atolls and at locations with fringing or barrier reefs will likely be much smaller than the forecast indicates.
For other areas covered by this product a forecast has not yet been computed. the forecast will be expanded if necessary in subsequent products.

Measurements Levels

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

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