Alaska, 22 Julai – Satu gempa bumi kuat berskala 7.8 skala richter dilaporkan berlaku di persisiran Alaska pada petang tadi.
Gempa bumi yang berpusat 60 batu (98 kilometer) dari Perryville itu dikatakan berlaku pada kedalaman yang cetek iaitu sekitar 6 batu, bersamaan 10 kilometer dalam.
“Kedalaman di bawah 70 kilometer dianggap cetek,” kata ahli meteorologi CNN, Allison Chinchar.
“Ia penting kerana gempa bumi cetek sering menyebabkan banyak kerosakan berbanding gempa bumi yang lebih dalam, tanpa mengira kekuatan,” katanya.
Beberapa rakaman detik gempa turut dikongsi di media sosial.
2020 in Alaska is no joke ! pic.twitter.com/F6SbhByq8n #Earthquake #Tsunami
— Kheire Meirane Amare (@k_meiraneamare) July 22, 2020
Susulan itu, amaran tsunami dikeluarkan ke atas kawasan selatan Alaska.
An eerie sound as ships scurry out of harbor in Kodiak, Alaska this morning during Tsunami Warning. Video from Gabriel Broida. #earthquake pic.twitter.com/15rfO9RPt1
— EricSorensenā (@ERICSORENSEN) July 22, 2020
#Alaska is turning into a Stephen king movie scene. #Tsunami #Earthquake pic.twitter.com/WMo7HwWooC
— Kheire Meirane Amare (@k_meiraneamare) July 22, 2020
#tsunami #Kodiak up the mountain to the high-school. Tsunami didn't hit yet. But might get worst not sure. Been out here a couple hours. pic.twitter.com/qRAb3arGO6
— Pride909 (@Pride909) July 22, 2020
Sirens blasting. Sounds of helicopters in the air. Everyone waiting the 12:05 impact time. #tsunami #Alaska pic.twitter.com/mBZmvssLQz
— Timothy Daugherty šŗšø ā¼ (@TheCoastiemater) July 22, 2020
The #homer spit is being evacuated. Thereās been a massive #earthquake to the south and the tsunami sirens are blaring. Cars are streaming up Skyline, one after the other outside my window. #Alaska pic.twitter.com/KOQFcabnhH
— Kelsey Frazier (@_drfreeze) July 22, 2020
MORE: sirens go off in #Alaska to warn the residents of a possible incoming #tsunami pic.twitter.com/9YjneOBF4E
— News flash (@BRNewsFlash) July 22, 2020
Namun, menurut CNN, amaran tersebut ditarik balik tidak lama kemudian oleh Perkhidmatan Cuaca Kebangsaan.
Tsunami berisiko terjadi apabila gempa bumi yang berlaku mempunyai magnitud yang tinggi dan berlaku di tempat cetek. Gempa antara 7.6 hingga 7.8 skala richter berpotensi mengakibatkan tsunami yang memusnahkan.
An earthquake with a preliminary magnitude of 7.8 struck off the coast of Alaska early Wednesday morning.
