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Subduction - how we know

Subduction is a fundamental Earth process, a cornerstone of plate tectonics. It's why the "Ring of Fire" exists - and is responsible for major geo-hazards - volcanic mega-eruptions, devastating mega-thrust 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. #ringoffire #tectonics #geology #earthquakes #subduction #indonesia #geophysics