INFRAVOLC
More resources are available at https://sites.google.com/boisestate.edu/infravolc/home including technical information about infraBSU and Gems infrasonic microphones. Below you can find examples of volcano infrasound research Note that all the converted infrasound-to-audio examples will sound better with headphones!
InfraBSU Lab Prospectus 0127_2024.pdf2024 Infrasound Lab Prospectus at Boise State University
LIGHTNING TALK - overview of some current projects
Johnson_intro.movVOLCANO INFRASOUND FROM A BIG ERUPTION
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.
Villarrica March 3rd 2015.m4aVillarrica March 3rd 2015 Compressed.movThe 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).
Villarrica Cable Deployment Trimmed.movYASUR (Vanuatu) EXPLOSION INFRAOUND
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.
Yasur_3D-desktop.m4vYasur Explosion.movExtraordinaryEarth.mp4VOLCANO INFRASOUND 'SONIFIER'
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.
VillarricaSonifyExcerpt.mp3LAHAR INFRASOUND AT VILLARRICA (CHILE)
Villarrica Lahar Animation Final Compressed.movSped-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.
Villarrica Lahar Animation Final Compressed.m4aLAHAR INFRASOUND AT FUEGO (GUATEMALA)
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.
Fuego_lahar0629_10s.mp4Fuego_lahar06291555_25min.mp4COTOPAXI (ECUADOR) INFRASOUND TORNILLOS
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.
VOLCANO INFRASOUND 'CAMERA'
view of Kilauea caldera and overprinted backazimuth to infrasound source using semblance (Fisher statistic)
Kilauea210414154752.mp4LCC_Avalanche_Flyover_Movie-desktop_Shortened.movAVALANCHE INFRASOUND
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.
avalanche_ms01.movJGR_BBC_Avalanche_Movie.mov