Massivt jordskred utlöste rekordstor tsunami i en fjord i Alaska

6 maj 2026

Rapporterad av AI

Ett enormt jordskred i fjorden Tracy Arm i Alaska den 10 augusti 2025 orsakade den näst största tsunamin som någonsin registrerats, med vågor som nådde en höjd på 481 meter. Händelsen flyttade 64 miljoner kubikmeter sten och skapade en seismisk signal med magnituden 5,4.

Jordskredet inträffade klockan 05.26 när en bergssida ovanför fjorden kollapsade och skickade stenmassor i vattnet i hög hastighet. Detta utlöste en tsunami som färdades fram genom fjorden i minst 70 meter per sekund och skapade en seichevåg som fortsatte att svalla i 36 timmar. Forskare ledda av Dan Shugar vid University of Calgary rekonstruerade senare händelsen med hjälp av satellitbilder, seismiska mätningar, ögonvittnesskildringar och datormodeller.

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Massivt jordskred utlöste rekordstor tsunami i en fjord i Alaska

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