Subduction is a fundamental Earth process, a cornerstone of plate tectonics. It's why the "Ring of Fire" exists and is responsible for major geohazards volcanic megaeruptions, devastating megathrust earthquakes and associated tsunamis. But how do we know it happens? Follow how geophysicists found and identified subduction zones and how nowadays we can image them, penetrating deep inside the Earth.
This video was first published to sit alongside the fourth season of the BBC's "Race Across the World" and forms part of The Shear Zone YouTube channel.
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