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📘 How a caldera collapses

Understand how magma withdrawal, ring faults, ash deposits, and renewed heat create a caldera.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A large reservoir
Eruption volume
Ring faults
Ash and ignimbrite
After collapse
Resurgence
Size and shape
Hydrothermal change
Monitoring
A long-lived system

Questions this course answers

What causes the main collapse in a caldera-forming event?

Evacuating magma lowers pressure and can let the roof sink along ring faults.

What are ring faults?

They commonly bound the sinking central block.

What is ignimbrite?

Pyroclastic flows can weld and consolidate into ignimbrite.

What is a resurgent dome?

Magma entering beneath the caldera can push its floor upward.

Why do scientists monitor calderas?

Multiple signals reveal changes in the volcanic and hydrothermal system.

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