Temperature inversions, where a layer of cool air sits beneath a layer of warmer air, can act as a waveguide for sound waves, trapping them and allowing them to travel much farther than they normally would in normal atmospheric conditions. The Physics of Sound: How the Noise Traveled So Far Sound travels through the air as a pressure wave, and the human ear detects these changes in pressure as noise.
The Atmosphere's Sound Channel: How Temperature Inversions Carried Krakatoa's Noise
The Catastrophic Mechanism: Why the Eruption Was So Violent At the heart of the volume was the sheer scale of the eruption, driven by a massive volume of magma interacting violently with seawater. Barometric Waves and the Global Detection The loud noise was not just a series of audible reports; it was a massive atmospheric pressure pulse.
4,800 km (3,000 miles) Pressure waves recorded by barographs in London and Vienna Approx. The eruption occurred at a time when these conditions were present, effectively creating a natural acoustic duct that channeled the energy of the explosion around the globe multiple times.
The Atmosphere's Sound Channel: How Temperature Inversions Carried Krakatoa's Noise
The eruption of Krakatoa generated a series of powerful infrasound waves—frequencies below the range of human hearing—as well as audible sound. These barometric waves propagated outward from the source, and sensitive instruments like barographs in Germany and the United Kingdom recorded the pressure changes days after the initial explosion.
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