Why do subduction zone volcanoes typically result in violent, explosive eruptions?
Answer
High viscosity magma traps expanding gases until pressure is released.
Magmas in these settings often contain high amounts of silica, making them thick and sticky. This viscosity prevents gases from escaping until the magma nears the surface, leading to rapid, explosive expansion.
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BEHIND THE SCIENCE 2011 | Subduction Zone Volcanoes
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