The 1883 eruption of Krakatoa
One of history's deadliest volcanic eruptions, producing the loudest known sound.
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The 1883 eruption of Krakatoa, a volcanic island in the Sunda Strait within the Dutch East Indies (modern Indonesia), began on 19 May and continued until 21 October, lasting over five months. The most catastrophic event occurred on 27 August, destroying more than 70 percent of the island and its surrounding archipelago, which collapsed into a caldera. This eruption, rated a 6 on the Volcanic Explosivity Index, ranks among the deadliest and most destructive in recorded history.
Explosions
The third explosion on that day, at 10:02 a.m., remains the loudest sound ever measured, heard as far away as Perth, Australia, and Rodrigues near Mauritius. Its acoustic pressure wave circled the globe more than three times. At least 36,417 deaths are attributed to the eruption and the resulting tsunamis.
Early phase
In the years prior, intense seismic activity was felt, including an earthquake in 1880 that damaged a lighthouse. Strombolian activity began on 20 May from Perboewatan, the northernmost cone. Ash eruptions reached high altitudes, with explosions audible in Batavia (Jakarta). By 16 June, loud explosions and a thick black cloud covered the islands for five days.
Climactic phase
Eruptions intensified through July, and by early August, a Dutch engineer noted three major ash columns and steam from at least eleven vents. On 26 August, the climactic phase began, with a black ash cloud reaching high altitudes and explosions audible across Java. Small tsunamis hit shores that evening.
On 27 August, eleven enormous explosions occurred. The first at 5:30 a.m. triggered a tsunami toward Telok Betong. A second at 6:44 a.m. produced waves east and west. The third, largest explosion at 10:02 a.m. was calculated at 180 decibels at a distance of 160 kilometers.
The sound was not heard close to the volcano, possibly due to sound waves reflecting off the stratosphere. The explosions and tsunamis likely had distinct causes, with the waves following ejecta slumping into the sea. Additional seismic activity was reported until February 1884, though later reports were dismissed by investigator Rogier Verbeek.
Lore & Background
The 1883 eruption of Krakatoa, located in the Sunda Strait within the Dutch East Indies (modern-day Indonesia), began on 19 May and continued until 21 October, lasting over five months. The island featured three main cones: Perboewatan, Danan, and Rakata. Early Strombolian activity from Perboewatan sent ash to 6 km, with explosions heard 160 km away in Batavia.
By June, new vents appeared between Perboewatan and Danan, and eruptions intensified through July. On 25 August, the eruption entered its climactic phase, with a black ash cloud reaching 27 km high by 26 August. The climax occurred on 27 August with eleven enormous explosions, the third at 10:02 a.m. being the loudest-known sound in history, heard 3,110 km away in Perth and 4,800 km away near Mauritius. The acoustic pressure wave circled the globe more than three times.
The explosion destroyed over 70% of the island, collapsing it into a caldera. At least 36,417 deaths resulted from the eruption and its tsunamis. The eruption had a Volcanic Explosivity Index of 6, making it one of the deadliest volcanic events in recorded history.
Common Misconceptions (Editorial)
Some people believe the loudest sound from the eruption occurred at the very start or was a single, continuous blast, but the facts show the loudest-known sound in history was the third explosion at 10:02 a.m. on 27 August. Others think the eruption destroyed the entire island completely, but the records indicate it destroyed over 70% of it, with the remaining portion collapsing into a caldera.
Why It Matters (Editorial)
The 1883 eruption of Krakatoa endures as a stark reminder of nature’s capacity for instantaneous, planetary-scale devastation. Its thunderous finale, still the loudest sound ever recorded, and the global pressure wave it generated, underscore how geological events can transcend borders and reshape human understanding of risk and resilience.
Reader's Guide
Its climactic explosion on 27 August produced the loudest sound ever recorded, heard across thousands of kilometers, and generated a pressure wave that circled the Earth multiple times. The eruption destroyed over 70% of the island and triggered massive tsunamis that devastated coastal communities, causing tens of thousands of deaths. The event provided crucial data for understanding volcanic explosivity, pyroclastic flows, and tsunami generation.
The eruption's global effects, including atmospheric dust and pressure waves, influenced scientific study of volcanic impacts on climate and sound propagation. Rogier Verbeek's subsequent investigation dismissed later seismic reports, shaping the historical record. Krakatoa's eruption remains a benchmark for measuring volcanic power and a cautionary example of nature's destructive capacity.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: 1883 eruption of Krakatoa (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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