Large-scale magmatic–hydrothermal system of Kusatsu-Shirane Volcano, Japan, revealed by broadband magnetotellurics

Matsunaga, Yasuo; Kanda, Wataru; Koyama, Takao; Takakura, Shinichi; Nishizawa, Tatsuji

doi:10.1016/j.jvolgeores.2022.107600

Cited by 6 publications

(3 citation statements)

References 53 publications

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“…Figure 10a shows the estimated source locations of the tilt onset, VLP signals, tensile opening (Terada et al., 2021), and volcanic tremor (Yamada et al., 2021). Except for volcanic tremor, all source locations are aligned from the low‐resistivity region (Matsunaga et al., 2022; Nurhasan et al., 2006; Tseng et al., 2020) toward the Motoshirane summit. We interpret the results representing the hydrothermal intrusion path that triggered the 2018 eruption.…”

Section: Discussionmentioning

confidence: 99%

“…Kusatsu‐Shirane volcano in Japan has a persistent volcanic hydrothermal system (e.g., Matsunaga et al., 2022; Nurhasan et al., 2006; Ohba et al., 1994; Terada & Hashimoto, 2017). Apart from a phreatic eruption on 23 January 2018, all documented eruptions (since 1882) and most unrest activities have occurred at the Shirane cone (Figure 1), which hosts a crater lake of Yugama and several active fumaroles and springs at the flank.…”

Section: Introductionmentioning

confidence: 99%

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The Onset, Middle, and Climax of Precursory Hydrothermal Intrusion of the 2018 Phreatic Eruption at Kusatsu‐Shirane Volcano

Yamada,

Terada,

Noguchi

et al. 2023

JGR Solid Earth

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Triggering intrusions of phreatic eruptions are often observed as seismic and ground deformation signals on a time scale of minutes. The current understanding of hydrothermal intrusions still needs improvement to obtain insight into the eruption scale from the observables. We examine local geophysical data from the precursory hydrothermal intrusion of the 2018 phreatic eruption of Kusatsu‐Shirane volcano. To achieve an integrated intrusion model, we divide analyzing time window into the onset, middle, and climax. Focusing on the transient response of tilt data for the sudden pressurization, we estimate a vertical tensile opening (1.7 × 103 m3/s in 40 s) at 1.1 km depth for the intrusion onset. Pressurization can represent the start of vapourization. Very long period (VLP, 0.033–0.1 Hz) seismic signals are adopted to constrain the middle and climax phases. We obtained two sequential semi‐horizontal tensile crack oscillation sources with peak volume changes of 3.6 × 104–1.9 × 105 m3 at 0.3–0.6 km depths. The second VLP source acted as a final trigger of the eruption to cause depressurization in the shallow portion of the intruded region, which is constrained as having reached 0.1 km depth by surface deformation. Simultaneously, we find another depressurization originated from depth in the climax due to a decrease in the hydrothermal intrusion rate. Through comparison with the 2014 Ontake phreatic eruption, the total inflation volume may correlate with eruption scales. Intruded hydrothermal fluid and local structure characteristics also may have to be considered to evaluate the eruptions scales from inferred signal source intensity.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Onset, Middle, and Climax of Precursory Hydrothermal Intrusion of the 2018 Phreatic Eruption at Kusatsu‐Shirane Volcano

Yamada,

Terada,

Noguchi

et al. 2023

JGR Solid Earth

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“…In contrast, the MT method uses naturally generated EM fields as a source, eliminating the reliance on a transmitter, generally increasing the depth of investigation, and simplifying logistics in the field. MT has been used for remote detection and imaging of volumes of partially molten magma beneath volcanic systems for many years (e.g., Aizawa et al., 2014; Comeau et al., 2016; Hill et al., 2009; Ingham et al., 2009; Matsunaga, Kanda, Koyama, et al., 2020; Matsunaga, Kanda, Takakura, et al., 2020; Mogi & Nakamura, 1993; Ogawa et al., 2014; Park & Torres‐Verdin, 1988; Tseng et al., 2020; Wannamaker et al., 2009; Yang et al., 2021; Ye et al., 2018; Zhang et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Magnetotelluric Investigations of the Kīlauea Volcano, Hawaii

Hoversten¹,

Newman²,

Gasperikova³

et al. 2022

JGR Solid Earth

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In 2002 and 2003 a collaborative effort was undertaken between Lawrence Berkeley National Laboratory, Sandia National Laboratories, the U.S. Geological Survey (USGS) Menlo Park, the USGS Hawaiian Volcano Observatory, and Electromagnetic Instruments Inc. to study the Kīlauea volcano in Hawaii using the magnetotelluric (MT) technique. The work was motivated by a desire to improve understanding of the magma reservoirs and conduits within Kīlauea and the East and Southwest Rift zones, which has implications for understanding Kīlauea's plumbing system. An improved understanding of the rift zones has implications in understanding large‐scale landslides that are generated in the Hilina Slump, which produce significant impacts on coastal communities. Up to eight stations operated simultaneously, with multiple remote reference sites, and data were processed using multi‐station robust processing techniques. In total, data were acquired at 70 sites over the Southwest and East rift zones. Good to excellent quality data were obtained even in the harshest conditions, such as those encountered on the fresh lava flows of the East Rift Zone, where electrical contact resistances are on the order of 100 kΩ. A three‐dimensional (3D) MT model study was done to guide interpretation of the observed MT measurements. Synthetic modeling demonstrates that conductive bodies in the upper 3 km can be spatially resolved where MT station sampling is good. Resistivity anomalies in the 3D inversions have a high degree of spatial correlation with previously published seismic velocity anomalies beneath Kīlauea. Melt fractions between 0.096 and 0.117 are calculated for the Kīlauea and Puʻuʻōʻō low resistivity anomalies, respectively.

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Electrical resistivity structure across the Late Cenozoic Abaga-Dalinor volcanic field, eastern China, from 3-D magnetotelluric imaging and its tectonic implications

Dong

Zhan

Xiao

et al. 2023

Journal of Asian Earth Sciences

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Large-scale magmatic–hydrothermal system of Kusatsu-Shirane Volcano, Japan, revealed by broadband magnetotellurics

Cited by 6 publications

References 53 publications

The Onset, Middle, and Climax of Precursory Hydrothermal Intrusion of the 2018 Phreatic Eruption at Kusatsu‐Shirane Volcano

The Onset, Middle, and Climax of Precursory Hydrothermal Intrusion of the 2018 Phreatic Eruption at Kusatsu‐Shirane Volcano

Magnetotelluric Investigations of the Kīlauea Volcano, Hawaii

Electrical resistivity structure across the Late Cenozoic Abaga-Dalinor volcanic field, eastern China, from 3-D magnetotelluric imaging and its tectonic implications

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