For the first time scientists managed to record the thunder that occurs in the ash columns of an active volcano. To achieve this, isolating this sound from the rest, a group of geophysicists from the Alaska Volcano Observatory, placed microphones 65 kilometers from the Bogoslof volcano, in the Aleutian Islands, and recorded up to 60 eruptions between December 2016 and August 2017.
You can hear the result below.
Remember the popcorn
After months of recordings and data collection, the researchers concluded that the bursts they heard could only be thunder. In the audio, thunder sounds like small bursts that click on the great noise of the eruption.
His work has been published in the magazine Geophysical Research Letters and it is expected to be used to calculate the density of smoke clouds and recommend prevention measures for air transport and civil protection in other areas of the world with volcanic activity.
To measure the fierceness of the eruption of a volcano, the Volcanic Explosive Index (IEV), a scale that ranges from 0 to 8, and that is based on the volume of ejected material, the height of the eruptive cloud and other variables. On average, about 540 people a year are the victims of volcanic eruptions. Between 1500 and 2017, more than 278,000 people.