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.pdf

2024 Infrasound Lab Prospectus at Boise State University

LIGHTNING TALK - overview of some current projects

Johnson_intro.mov

VOLCANO 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.m4a

Villarrica March 3rd 2015 Compressed.mov

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).

Villarrica Cable Deployment Trimmed.mov

YASUR (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.m4v

Yasur Explosion.mov

ExtraordinaryEarth.mp4

VOLCANO 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.mp3

LAHAR INFRASOUND AT VILLARRICA (CHILE)

Villarrica Lahar Animation Final Compressed.mov

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.

Villarrica Lahar Animation Final Compressed.m4a

LAHAR 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.mp4

Fuego_lahar06291555_25min.mp4

COTOPAXI (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.mp4

LCC_Avalanche_Flyover_Movie-desktop_Shortened.mov

AVALANCHE 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.mov

JGR_BBC_Avalanche_Movie.mov

EARTHQUAKE SOUNDS

audio clips here correspond to an Idaho M3.6 earthquake recorded with infrasound on April 8th, 2020 and sped up x10, x20, x30, and x40. Various clips correspond to infrasound recorded at different stations located 1 to 25 km from the hypocenter (refer to map).

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