2024 Infrasound Lab Prospectus at Boise State University
example from Villarrica chronicles the highlights of a 10-hour eruptive sequence including the lahar. Narration is designed to draw attention to the most import components of the eruption. Audio clip only is below.
The eruption of Volcán Villarrica in March 2015 was preceded by changing character of the infrasound relatable to the rising lava lake (below left). As the crater depth decreased the changing frequency of infrasound was notable. A follow-up project in 2020 was aimed to better understand the relationship between crater shape and infrasound (below right).
Crater resonance is being explored through acoustic wave modeling using topographic models created with Structure-from-Motion. Accurate maps of craters can be made using quadcopter drones.
Portable Realtime Volcano Infrasound Auditory Display Devices - Sonified infrasound of the Villarrica volcano using carrier frequency of 50 Hz and an index of modulation of 20.
Sped-up animation of a lahar descending the north side of Villarrica (Chile). The audio corresponds to infasound recordings sped up by a factor of 30, i.e. 15 minutes = 30 s. Infrasound is recorded in stereo so listen with headphones if possible. Audio clip only is also provided below. This lahar event is featured in a Geophysical Research Letters paper from 2015 entitled Lahar Infrasound Associated with Volcan Villarrica's 3 March 2015 Eruption.
Secondary lahars occur during the rainy season. An ongoing project is working to better understand lahar infrasound through co-incident time lapse recording of these mud flows.
Graphical and audio versions of tornillos played at various speeds. These signals are featured in a Geophysical Research Letters paper from 2018 entitled Infrasound Tornillos Produced by Volcano Cotopaxi's Deep Crater. Sound examples use tornillo modulation of audio noise sped up by x1, x2, and x4 actual speed.
view of Kilauea caldera and overprinted backazimuth to infrasound source using semblance (Fisher statistic)
Ongoing work in Little Cottonwood Canyon, UT (left) is now being applied to identify and track snow avalanche activity in near real-time with collaboration from Snowbound Solutions.
(below) triggered avalanche from March 13th, 2018 was recorded with video and with GOPRO. Coincident recordings was used to estimate acoustic source intensity.