From NOVA PBS Official.

A massive earthquake along the Cascadia Subduction Zone could unleash a tsunami and sink parts of the Pacific Northwest by several feet.

A 2025 study suggests that when the next "Big One" hits, coastal land could sink by up to 6 feet. That sudden drop could instantly double the number of people, homes, and roads exposed to flooding.

Chapters
00:00 Introduction
00:44 What is the Cascadia Subduction Zone?
02:32 Predicting the Next "Big One"
03:58 How The Pacific Northwest is Preparing for a Massive Earthquake

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