Volcanoes: Earth’s Largest Horns
During a week-long excursion to Volcán Villarrica in January 2020, we collected infrasound data using a large (N=22) network distributed around the crater. During this time, a wavering of the frequency of Villarrica’s continuous monotonic infrasound was observed between 0.7-1.1 Hz. Since activity was stable, we argue that this frequency fluctuation can be explained through reasonable variations in sound speed. Past studies have found that a rise in the frequency of Villarrica’s monotonic infrasound may be precursory to an eruption. Therefore, it is important to distinguish between a rise in frequency leading towards an eruption or just due to atmospheric conditions. The efforts of this research can be expanded to many other open vent volcanoes, specifically those with active lava lakes. With Villarrica being one of the most popular tourist locations in Chile, as well as having a history of lahar flows, this system has a high potential for hazard.