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Naturally Hazardous

Naturally Hazardous

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1883 — Krakatoa Eruption

One of the Deadliest Volcanic Eruptions of All Time

2 min readMay 20, 2025

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On May 20, 1883, Krakatoa awoke. One of the deadliest volcanic eruptions of all time starts

Krakatoa is a volcanic island situated in the Sunda Strait, between Java and Sumatra.

It lies on the Pacific Ring of Fire, a highly active tectonic zone where the Indo-Australian Plate subducts beneath the Eurasian Plate.

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The most devastating phase of the eruption began on August 27, 1883.

The VEI 6 explosion was so intense that it caused most of the island to collapse into a caldera, ejecting an enormous volume of volcanic material and generating a series of deadly tsunamis.

The eruption destroyed more than 70% of Krakatoa and resulted in:

  • 25 km² of volcanic material ejected.
  • A death toll estimated between 36,000 and 100,000 people.
  • Global average temperatures dropped by 1.2°C (2.2°F) over the following five years due to the massive amounts of ash and sulfur dioxide released into the atmosphere.

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