This volcano confided in the unique voice after a rash

The Cotopaxi volcano in Ecuador has a profound and distinct voice. Between the end of 2015 and the beginning of 2016, the volcano repeated an unusual pattern of low-frequency sounds that now researchers attributed to the unique geometry of the inner crater. The identification of the "vocal stamp" of volcanoes can help scientists anticipate changes in craters, including those that predict a rash.

Ecuadorians scholars have installed a network of special microphones on the flanks of the volcano that can record sounds with very low frequency, also called infrasound. Two weeks after the 2015 eruption of the volcano, the network recorded the unusual acoustic pattern-a strong, clear oscillation, which is thinning over time, according to the reports of scholars recently published in Geophysical Research letters.

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Cotopaxi repeated this pattern 37 times between September 2015 and April 2016. Each time, the signal had several tens or more oscillations, resembling with a musical instrument, before it disappeared. "The volcano sounded like a bell for more than a minute," said Geofizicianul Jeffrey Johnson of Boise State University in Idaho, the researcher who led the study, writes Science News.

Cotopaxi's "Voice" is unusually low for registered volcanoes so far, resonating at about 0.2 Hz, frequency five times lower than other volcanoes. Johnson and his colleagues attribute this strange stamp to the air circulating in the depths of the volcano's cylindrical crater.

Also, according to Johnson, the voice of a volcano may change due to the lifting or lowering of the magma lake in the crater.

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