2017
DOI: 10.1002/2017gl074971
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Capturing the Acoustic Radiation Pattern of Strombolian Eruptions using Infrasound Sensors Aboard a Tethered Aerostat, Yasur Volcano, Vanuatu

Abstract: We obtained an unprecedented view of the acoustic radiation from persistent strombolian volcanic explosions at Yasur volcano, Vanuatu, from the deployment of infrasound sensors attached to a tethered aerostat. While traditional ground‐based infrasound arrays may sample only a small portion of the eruption pressure wavefield, we were able to densely sample angular ranges of ~200° in azimuth and ~50° in takeoff angle by placing the aerostat at 38 tethered loiter positions around the active vent. The airborne dat… Show more

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Cited by 42 publications
(69 citation statements)
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“…Our study aims to determine if acoustic directionality is resolvable and explore the stability of both monopole and multipole source inversions of discrete explosions of Yasur volcano by sampling the wavefield in both the horizontal and vertical directions. Our deployment consists of a traditional deployment of infrasound sensors on the ground surface, as well as a sensor onboard a tethered aerostat that was fixed at various locations around the volcanic crater, capturing explosions from a variety of azimuths and inclinations (Jolly et al, ). We use finite‐difference time‐domain (FDTD) modeling to obtain the full 3‐D Green's functions for each propagation path from source to receiver.…”
Section: Introductionmentioning
confidence: 99%
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“…Our study aims to determine if acoustic directionality is resolvable and explore the stability of both monopole and multipole source inversions of discrete explosions of Yasur volcano by sampling the wavefield in both the horizontal and vertical directions. Our deployment consists of a traditional deployment of infrasound sensors on the ground surface, as well as a sensor onboard a tethered aerostat that was fixed at various locations around the volcanic crater, capturing explosions from a variety of azimuths and inclinations (Jolly et al, ). We use finite‐difference time‐domain (FDTD) modeling to obtain the full 3‐D Green's functions for each propagation path from source to receiver.…”
Section: Introductionmentioning
confidence: 99%
“…Here we build upon these previous studies by using the inversion method of Kim et al () and including the multipole source. By accounting for topography to create the synthetic waveforms, we can examine how much of the observed directive radiation pattern (Jolly et al, ) is due to topography or source directivity (i.e., a dipole source mechanism), a problem evident in Kim et al () that has remained undetermined.…”
Section: Introductionmentioning
confidence: 99%
“…The reclined S shape of N shows that spectral power is transferred away from the peak source frequency at 10-20 kHz ( N < 0) to higher frequencies at which N >0. Figures are reproduced from Reichman et al (2016) and Miller and Gee (2018) with permission. 2018; Watson et al, 2019), and source directivity (Jolly et al, 2017;Kim et al, 2012). Therefore, improved understanding of near-source distortions can lead to more accurate estimates of volcano-acoustic source characteristics.…”
Section: Introductionmentioning
confidence: 99%
“…where ρ is the density of the ground, c is the seismic medium velocity, S is the site response, U is the seismic amplitude, and A is the wave propagation attenuation that can be determined from A = e (−πƒr/cQ) . Estimating seismic energies, values of ρ = 2120 kg/m 3 and a homogeneous p-wave estimate of c = 2200 m/s (Jolly et al 2017b) were used for Whakaari. Due to possible directional variations among the network array (topography, source directionality of the radiation pattern, site effects, etc.)…”
Section: Determining Eruption Pulse Characteristics Using the Volcanimentioning
confidence: 99%