Tsunami alerts in Alaska and West Coast lifted
2:11
Tsunami alerts in Alaska and West Coast lifted
Tsunami warnings and alerts posted for much of the West Coast are now canceled or downgraded. They were triggered by a 7.9-magnitude earthquake in the Pacific Ocean, southeast of Alaska's Kodiak Island. John Blackstone reports.
CBS NewsJan 23, 2018
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How Tsunami Occurs A tsunami typically occurs when there is a sudden movement along faults in the Earth’s lithospheric plates, often due to an undersea earthquake. These plates, which make up the Earth’s outer shell, shift and collide at their boundaries. When stress builds up and is released along a subduction zone—where one lithospheric plate is forced beneath another—this displacement causes a large volume of water to be abruptly pushed upward, generating tsunami waves. These waves travel acr
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How Tsunami Occurs A tsunami typically occurs when there is a sudden movement along faults in the Earth’s lithospheric plates, often due to an undersea earthquake. These plates, which make up the Earth’s outer shell, shift and collide at their boundaries. When stress builds up and is released along a subduction zone—where one lithospheric plate is forced beneath another—this displacement causes a large volume of water to be abruptly pushed upward, generating tsunami waves. These waves travel acr
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