The Volcanological and Seismological Observatory took a selection from a seismograph registered inside Turrialba Volcano's central crater and converted it into a sound file. The effect allows you to “hear” the volcano’s sub-audible rumbling.
The crater of Poas Volcano expelled material 300 meters into the air at noon on Tuesday. The phenomenon, called a phreatic explosion, occurred due to a reaction between magma and water at the southern border of the lake inside the volcano. However, this was not an eruption and the volcano did not spew lava. Instead, a column of steam, gas and other materials formed and spouted out the top of the volcano, confirmed the Volcanological and Seismological Observatory of Costa Rica (OVSICORI).