Key information extracted from original GTS message :
- An earthquake with a preliminary magnitude of 7.7 occurred southeast of the loyalty ISLANDS at 0257 UTC on friday MAY 19 2023
- TSUNAMI waves have been observed
- Based on all available data hazardous TSUNAMI waves are forecast for some coasts
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- TSUNAMI waves reaching 0.3 to 1 meters above the tide level are possible for some coasts of vanuatu.
- 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... fiji... FRENCH polynesia... howland and baker... JARVIS island... kermadec islands... kiribati... kosrae... MARSHALL islands... nauru... NEW zealand... niue... palmyra island... PAPUA NEW guinea... pohnpei... samoa... SOLOMON islands... tokelau... tonga... tuvalu... WALLIS and futuna... and NEW caledonia.
- 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.
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- 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
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| GAUGE LOCATION | LAT | LON | TIME (UTC) | HEIGHT (m) | PERIOD (min) |
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| Thio New Caledonia | -21.6 | 166.2 | 04: 09 | 0.07 | 20 |
| Lenakel Vu | -19.5 | 169.3 | 04: 02 | 0.45 | 04 |
| Mare New Caledonia | -21.5 | 167.9 | 04: 13 | 0.19 | 06 |
| Ouinne New Caledon | -22 | 166.7 | 04: 06 | 0.20 | 08 |
| Lifou New Caledoni | -20.9 | 167.3 | 04: 00 | 0.12 | 06 |
