Surface eruptive dynamics of 2018 small phreatic eruption of Iwo-Yama volcano, Japan: Constraints from seismo-acoustic observation and mud suspension rheology

Muramatsu, Dan; Ichihara, Mie; Matsushima, Takeshi; Kuwano, Osamu; Tajima, Yasuhisa

doi:10.1016/j.jvolgeores.2021.107452

Cited by 5 publications

(6 citation statements)

References 77 publications

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“…(2012) showed that infrasound and vertical ground motion were coupled during volcanic activity via a cross‐correlation analysis of infrasound and vertical ground velocity data at Asama and Shinmoe‐dake volcanoes in Japan. Infrasound–vertical ground motion coupling has been further confirmed via similar cross‐correlation analysis (Matoza & Fee, 2014; Muramatsu et al., 2022; Yukutake et al., 2018). These data suggest that the infrasound signal produced by the volcanic activity vibrates the ground surface and subsequently generates seismic motion.…”

Section: Introductionmentioning

confidence: 58%

Infrasound–Electric‐Field Coupling Associated With the 2018 Shinmoe‐Dake Eruptions, Kirishima Volcanic Complex, Japan

Aniya

Aizawa

Matsushima

2022

Geophysical Research Letters

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Multiparametric observations are commonly acquired around volcanoes to monitor volcanic activity, with seismic motion and ground deformation being the primary geophysical observations that are obtained around well-monitored active volcanoes. Infrasound, which is an acoustic wave that propagates through the air at frequencies below 20 Hz, has recently been added as a volcanic monitoring tool owing to its ability to record the occurrence and explosivity of eruptions. The increasing implementation of multiparametric observations in volcanic monitoring networks has led to the discovery that different types of data are coupled in terms of volcanic activity. For example, Ichihara et al. (2012) showed that infrasound and vertical ground motion were coupled during volcanic activity via a cross-correlation analysis of infrasound and vertical ground velocity data at Asama and Shinmoe-dake volcanoes in Japan. Infrasound-vertical ground motion coupling has been further confirmed via similar cross-correlation analysis (Matoza & Fee, 2014;Muramatsu et al., 2022;Yukutake et al., 2018). These data suggest that the infrasound signal produced by the volcanic activity vibrates the ground surface and subsequently generates seismic motion. Matoza et al. (2019) analyzed geophysical observations during the explosive eruptions at Popocatépetl volcano in Mexico, and reported that the high-amplitude initial phase of the infrasound waveform is inversely correlated with the vertical displacement waveform recorded by a broadband seismometer. These studies have clearly demonstrated that the propagation of the infrasound wave emitted by volcanic eruptions generates vertical ground motion.Clear coupling between the observed ground motion and electric field has been reported at a number of volcanoes. Collocated seismometer and telluric stations have shown that the ground shaking owing to seismic wave propagation can induce electric-field variations (e.g.,

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Section: Introductionmentioning

confidence: 58%

Infrasound–Electric‐Field Coupling Associated With the 2018 Shinmoe‐Dake Eruptions, Kirishima Volcanic Complex, Japan

Aniya

Aizawa

Matsushima

2022

Geophysical Research Letters

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“…were both still persistently steaming (Fig. 1d), but their activity was much weaker than the one reported by Muramatsu et al (2021Muramatsu et al ( , 2022. The acoustic signals from the calm activity of multiple fumaroles of Iwo-Yama had not been observed and analyzed in detail.…”

Section: Kirishima Iwo-yamamentioning

confidence: 79%

“…On 19 April 2018, the phreatic eruption occurred at the Iwo-Yama south crater (ISC) and then the Iwo-Yama west crater (IWC) became active. Muramatsu et al (2021Muramatsu et al ( , 2022 reported the infrasonic activities of the ISC and IWC during the phreatic eruption in April 2018. They identified two simultaneous sources using data recorded at two infrasound stations: a prominent source from the ISC and a weaker one from the IWC (Fig.…”

Section: Kirishima Iwo-yamamentioning

confidence: 99%

“…1b). Muramatsu et al (2022) documented the detail of the infrasonic activity at the ISC in the eruption period comparing with the images by a monitoring camera.…”

Section: Kirishima Iwo-yamamentioning

confidence: 99%

“…Because phreatic eruption jets and fumarolic jets generally produce weak infrasound (McKee et al 2017;Muramatsu et al 2021Muramatsu et al , 2022, we anticipated that the signals at Iwo-Yama were subtle, even below the microphones' self-noise. Therefore, we enclosed a newly developed high-sensitivity microelectromechanical systems (MEMS) microphone (Wada and Takahashi 2020; Additional file 1: S2) together with each ACO microphone, expecting that the use of two different types of microphones could confirm the robustness of the results.…”

Section: Observationsmentioning

confidence: 99%

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Experiment to distinguish two fumaroles consistently emanating infrasound at Kirishima Iwo-Yama

Yamakawa

Ichihara

Muramatsu

et al. 2023

Earth Planets Space

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In the infrasonic observation of a fumarolic field, distinguishing multiple fumarolic sources is challenging. The array technique effectively estimates the source locations and identifies the target signal from other signals and noise. We conducted an experiment at Kirishima Iwo-Yama, Japan, where two active fumarolic areas were separated by ~ 450 m. A three-element array with an aperture of ~ 20 m was installed between the two fumarolic areas. In addition, a single microphone was installed near one of the fumaroles. The array combined with the waveform correlation analysis estimated the most prominent source but failed to estimate the other weak source. A joint analysis of the array and the single microphone effectively resolved the two sources. It was also confirmed that newly developed power-saving MEMS microphones were useful for observing the fumaroles. This paper presents the instrumentation and analytical method that would be beneficial for monitoring volcanoes that have multiple hydrothermally active vents. Graphical Abstract

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Flow‐To‐Fracture Transition of Linear Maxwell‐Type Versus Yield Strength Fluids by Air Injection—Implications for Magma Fracturing

Sánchez

Ichihara

Kuwano

2023

Geophysical Research Letters

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To illuminate brittle and ductile fracturing of magma, we investigated bubble expansion and fracturing in two contrasting fluids: a Maxwell‐type viscoelastic fluid and a Bingham‐type yield‐strength fluid. Measurements of the complex shear modulus, G′ + iG″ (i is the imaginary unit), under small‐strain oscillation showed that both fluids are elastic (G′ > G″) with similar rigidity. Viscous behavior (G′ < G″) appeared at lower frequency in the Maxwell fluid but at larger strain in the Bingham fluid. When we injected air into the Maxwell fluid, bubbles expanded viscously at low flux, fractured in a brittle manner at high flux, and behaved transitionally at intermediate flux. In contrast, we observed no fracturing in the Bingham fluid. This demonstrates that the G′ > G″ condition is insufficient to infer that brittle fracturing can occur. Brittle fracturing of the Maxwell fluid occurred not at a critical strain rate but under decreasing strain rate and increasing stress.

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Surface eruptive dynamics of 2018 small phreatic eruption of Iwo-Yama volcano, Japan: Constraints from seismo-acoustic observation and mud suspension rheology

Cited by 5 publications

References 77 publications

Infrasound–Electric‐Field Coupling Associated With the 2018 Shinmoe‐Dake Eruptions, Kirishima Volcanic Complex, Japan

Infrasound–Electric‐Field Coupling Associated With the 2018 Shinmoe‐Dake Eruptions, Kirishima Volcanic Complex, Japan

Experiment to distinguish two fumaroles consistently emanating infrasound at Kirishima Iwo-Yama

Flow‐To‐Fracture Transition of Linear Maxwell‐Type Versus Yield Strength Fluids by Air Injection—Implications for Magma Fracturing

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