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1. Volcano Opto‐Acoustics: Mapping the Infrasound Wavefield at Yasur Volcano (Vanuatu)

   https://doi.org/10.1029/2022GL102029  

   Johnson, J_B; Boyer, T.; Watson, L_M; Anderson, J_F (April 2023, Geophysical Research Letters)

   Abstract We explore the capabilities of volcano opto‐acoustics, a promising technique for measuring explosion and infrasound resonance phenomena at open‐vent volcanoes. Joint visual and infrasound study at Yasur Volcano (Vanuatu) demonstrate that even consumer‐grade cameras are capable of recording infrasound with high fidelity. Passage of infrasonic waves, ranging from as low as 5 Pa to hundreds of Pa, from both explosions and persistent tremor, pressurizes and depressurizes ambient plumes inducing visible vaporization and condensation respectively. Optical tracking of these pressure wavefields can be used to identify spectral characteristics, which vary within Yasur's two deep craters and are distinct for explosion and tremor sources. Wavefield maps can illuminate the propagation of blasts as well as the dynamics of persistent infrasonic tremor associated with standing waves in the craters. We propose that opto‐acoustic monitoring is useful for extraction of near‐vent infrasound signal and for tracking volcanic unrest from a remote distance. 

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2. The use of volcano alert levels by the Alaska Volcano Observatory-current practices and challenges

   Coombs, M L; Cameron, C; Schneider, D J; Wech; A (December 2023, In AGU Fall Meeting Abstracts (Vol 2023, No 214, pp V33F-0214))
3. The Alpehue geyser field, Sollipulli Volcano, Chile

   https://doi.org/10.1016/j.jvolgeores.2020.107065  

   Munoz-Saez, Carolina; Perez-Nuñez, Carolina; Martini, Sebastian; Vargas-Barrera, Alonso; Reich, Martin; Morata, Diego; Manga, Michael (November 2020, Journal of Volcanology and Geothermal Research)

   null (Ed.)
4. Investigating the Magma Dynamics at Huaynaputina Volcano

   Wheeler, Kira; Georgeais, Guillaume; Moussallam, Yves (December 2024, American Geophysical Union)

   Magma ascent rate is a challenging parameter to constrain yet a crucial element to investigate magma dynamics. The 1600 eruption of the Huaynaputina volcano was the largest recorded eruption in South America, with an impact area that now hosts approximately a quarter of Peru's population. The aim of this study is to investigate the magma ascent rate of the initial Plinian phase of the eruption using pyroclast texture. Scanning electron microscopy (SEM) was employed to image several pumice clasts. The images were then cleaned and processed using the Fast Object Acquisition and Measurement System (FOAMS) to obtain a vesicle number density. Melt inclusions in crystals were identified and double polished, and their H₂O content was analyzed using infrared spectroscopy (FTIR). The mean value of the BND is 4.09×10 6 mm⁻³, while the mean value of the H₂O content is 3.05%. According to the nucleation theory, the average decompression rate is thus calculated to be 13.47 MPa/s (ascent rate of 548 m/s). An alternative equation, which relies solely on the BND, provides a decompression rate of 9.06 MPa/s (ascent rate of 362 m/s). Both calculated values are high, but remain within a reasonable range for eruptions of this magnitude. If this eruption were to occur today, it would have a catastrophic impact. These results emphasize the necessity for further research to provide a deeper understanding of such destructive eruptions. 

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5. Volcanic ballistic projectile deposition from a continuously erupting volcano: Yasur Volcano, Vanuatu

   https://doi.org/10.30909/vol.03.02.183204  

   Fitzgerald, Rebecca Hanna; Kennedy, Ben M; Gomez, Christopher; Wilson, Thomas M; Simons, Benjamin; Leonard, Graham S; Matoza, Robin S; Jolly, Arthur D; Garaebiti, Esline (January 2020, Volcanica)

   null (Ed.)