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🌋 The eruption of Krakatoa

Follow Krakatoa from its warning eruptions and catastrophic collapse through tsunami, ash, global skies, and the new volcano Anak Krakatau.

lessons

~20 min

to learn

🏛️ History

subject

Adults

level

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What you’ll learn

The island begins to wakeLocate Krakatoa and explain how its early 1883 activity signaled an escalating volcanic crisis.Krakatoa stood in the Sunda Strait, where months of ash, explosions, and pumice preceded the catastrophic August sequence.
August 27 changes the islandDescribe the major explosions, island collapse, ash dispersal, and atmospheric effects of August 27, 1883.The climax destroyed much of the island, sent ash high into the atmosphere, and changed both the volcanic landscape and global skies.
The sea becomes the weaponDistinguish tsunami waves from pyroclastic flows and connect both hazards to coastal destruction.Collapse, hot flows, and water displacement produced different but interacting hazards that devastated the Java and Sumatra coastlines.
A new volcano grows inside the calderaExplain how Anak Krakatau formed and how modern observation tracks an active island volcano.A new cone grew inside the flooded caldera after 1927, while satellites and ground instruments now monitor the continuing system.
What Krakatoa changedSynthesize Krakatoa as a connected hazard system and explain why its history remains useful for planning.Krakatoa linked eruption, collapse, tsunami, atmospheric effects, communication, and recovery into one enduring lesson about compound hazards.

Questions this course answers

Why was Krakatoa's location especially dangerous?

Krakatoa lay in the Sunda Strait between Java and Sumatra, so explosive activity and water displacement threatened nearby coastal communities.

What happened to much of the pre-1883 island?

The eruption destroyed and submerged much of the island, while remnants remained around the flooded caldera.

What is a tsunami in the Krakatoa case?

Collapse, hot flows, and other volcanic disturbances displaced seawater, generating destructive waves along Java and Sumatra.

Why is Anak Krakatau important to the story?

Anak Krakatau began growing in the flooded caldera in the twentieth century, showing that the volcanic system remained active.

Which statement best summarizes Krakatoa's hazards?

Krakatoa combined explosions, collapse, pyroclastic flows, tsunami, ashfall, and atmospheric effects, so hazard planning must consider the chain.

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