Krakatoa Eruption Day

What Is Krakatoa Eruption Day?

August 27 marks "Krakatoa Eruption Day," commemorating the catastrophic eruption of Mount Krakatoa in Indonesia, which took place from August 26 to 27, 1883, and is considered one of the most violent volcanic events ever recorded.

An Explosion Heard Around the World

The eruption of Krakatoa was powerful enough to dramatically reshape the island in the Sunda Strait, and the resulting tsunamis are estimated to have killed around 36,000 people.

• Event: Mount Krakatoa in Indonesia erupted violently on August 26–27, 1883.
• Impact: Tsunamis triggered by the eruption are believed to have claimed roughly 36,000 lives.
• Notable fact: The sound of the explosion reportedly traveled as far as 5,000 km, making it one of the loudest sounds ever recorded.

An Eruption That Reached the Climate Itself

The eruption sent ash and gas high into the stratosphere, and reports from around the world describe unusually vivid sunsets and cooler temperatures in the following months — a striking reminder of the sheer scale of natural forces.

Ways to Mark the Day

• Learn about the history of the Krakatoa eruption
• Think about how communities can prepare for volcanic disasters
• Explore the connection between natural disasters and disaster preparedness
• Read about the geography and nature of Indonesia

Remembering the Power of Nature

Krakatoa Eruption Day is a chance to remember the scale of natural disasters and the lessons they leave behind. August 27 invites us to renew our awareness of disaster preparedness through a distant historical event.