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

2023-05-19 05:27 message from NTWC

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
Threat Forecast

  • 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.
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
Lenakel Vu-19.5169.304: 440.5204
Thio New Caledonia-21.6166.204: 090.0720
Mare New Caledonia-21.5167.904: 130.1906
Ouinne New Caledon-22166.704: 060.2008
Lifou New Caledoni-20.9167.304: 000.1206