A new study warns that the Cascadia Subduction Zone, dormant for over 300 years, could unleash a massive earthquake and a 100-foot tsunami, threatening cities along the US and Canadian west coast.

The earthquake may trigger rapid land subsidence of up to 2 meters, significantly heightening coastal flood risks.

Regions like Humboldt Bay are already experiencing ground sinking, with sea levels expected to rise by as much as 90 cm by the year 2100.

The study urges urgent disaster preparedness, stronger building codes, and coastal protections.