Was Krakatau's 1883 Eruption the Loudest Sound in the History?

TEMPO.CO, Jakarta - The 1883 eruption of Krakatau in Indonesia was so powerful that its effects extended far beyond the volcano itself. The explosions tore apart much of the island, triggered devastating tsunamis and sent pressure waves through the atmosphere.

The blasts were heard thousands of kilometers away, while atmospheric pressure changes linked to the eruption were recorded around the world.

The eruption reached its most destructive phase on August 27, 1883, when a series of massive explosions struck Krakatau, an island volcano in the Sunda Strait between Java and Sumatra.

But how loud was the explosion? The most powerful blast has been estimated at around 310 decibels, making it widely regarded as the loudest sound ever heard in modern history, according to Britannica.

The sound was reportedly heard as far as 4,800 kilometers (3,000 miles) from the volcano, highlighting the extraordinary scale of the eruption.

Why 310 Decibels Is Extraordinary

Sound is measured in decibels (dB), a logarithmic scale in which relatively small numerical increases can represent large changes in sound pressure.

For comparison, normal conversation is typically around 60 dB, while a loud concert can exceed 100 dB. Sounds above roughly 120 dB can cause pain and potentially damage hearing.

Krakatau’s estimated 310 dB was therefore far beyond the range of sounds encountered in everyday life.

At such extreme levels, the event is better understood not simply as an exceptionally loud noise, but as a massive pressure disturbance caused by the enormous energy released by the eruption.

How Far Was Krakatau’s Explosion Heard?

According to Wikipedia, the eruption’s sound traveled across vast distances over the Indian Ocean. Historical reports indicate that the explosions were heard in Perth, Western Australia, about 3,110 kilometers (1,930 miles) away, and on Rodrigues, near Mauritius, roughly 4,800 kilometers (3,000 miles) from Krakatau.

The pressure wave traveled even farther. It circled the globe more than three times, with atmospheric instruments recording pressure disturbances in locations far from the eruption.

The phenomenon demonstrated how an enormous volcanic explosion can transmit energy through the atmosphere across continents and oceans.

Krakatau’s Deadly Eruption

The sound was only one part of the disaster. The eruption generated a series of devastating tsunamis that struck coastal areas around the Sunda Strait.

The largest waves were estimated to have reached more than 30 meters (100 feet) high in some locations, sweeping through coastal communities in Java and Sumatra. Pyroclastic flows and surges also affected areas around the Sunda Strait, as quoted by GeoNet.

The explosion released an estimated 200 megatons of TNT worth of energy, roughly four times the yield of the Tsar Bomba, the most powerful nuclear weapon ever detonated.

The eruption and resulting tsunamis killed at least 36,417 people, making the 1883 Krakatau disaster one of the deadliest volcanic events in recorded history.

The relationship between the explosions and tsunamis was complex. While they occurred during the same catastrophic eruption, scientists believe they were driven by different processes.

The explosions were associated with the release of gas-rich magma, while the largest tsunamis likely followed the collapse of volcanic material into the surrounding sea.

Interestingly, the enormous blasts were not necessarily heard most clearly near the volcano. One possible explanation is that some of the sound energy was directed upward into the atmosphere, allowing the pressure waves to travel great distances while producing less noticeable sound closer to the source.

Krakatau’s Legacy

The 1883 eruption dramatically reshaped the landscape around the Sunda Strait and became a landmark event in the study of volcanic disasters.

The volcanic system remained active in the decades that followed, eventually producing a new cone from the caldera formed by the eruption. Known as Anak Krakatau, or “Child of Krakatau,” the volcano continues to be monitored by scientists.

More than a century later, the 1883 eruption remains a striking example of the extraordinary reach of volcanic activity. Its combination of enormous explosions, atmospheric pressure waves and deadly tsunamis shows how the effects of a single eruption can extend thousands of kilometers beyond its source.