Magmatic inflation in 2008–2010 at Mt. Fuji, Japan, inferred from sparsity-promoting L1 inversion of GNSS data

Mitsui, Yuta; Kato, Takahiro A.

doi:10.1016/j.jvolgeores.2019.04.012

Cited by 1 publication

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: 5-d Analysismentioning

confidence: 78%

“…On the other hand, the areas near Mount Fuji and Hakone Volcano showed eastward velocities (Figure 7a,b). Since expansions of volcanic edifices were observed by GNSS around Mount Fuji and Hakone Volcano during the study period [18,19], the eastward velocities might be consistent with the GNSS displacements. The quasi-upward velocity findings showed that the areas around Mount Fuji, Hakone Volcano, and the Izu Peninsula were uplifted, and the Ashigara Plain, located to the east of Hakone Volcano, subsided slightly (Figure 8a).…”

Section: 5-d Analysismentioning

confidence: 78%

“…The quasi-upward velocity findings showed that the areas around Mount Fuji, Hakone Volcano, and the Izu Peninsula were uplifted, and the Ashigara Plain, located to the east of Hakone Volcano, subsided slightly (Figure 8a). These displacements are thought to be caused by tectonic deformations by the Izu Peninsula colliding with the main part of the Japanese Islands [3] and volcanic activities [18,19]. To the west of Owakudani, where volcanic rock debris-avalanche deposits are distributed on the surface (Figure 2), a maximum subsidence rate of about 25 mm/year was observed within an area with a diameter of about 500 m (Figure 8b).…”

Section: 5-d Analysismentioning

confidence: 99%

See 2 more Smart Citations

Very Local Subsidence Near the Hot Spring Region in Hakone Volcano, Japan, Inferred from InSAR Time Series Analysis of ALOS/PALSAR Data

2020

View full text Add to dashboard Cite

Monitoring of surface displacement by satellite-based interferometric synthetic aperture radar (InSAR) analysis is an effective method for detecting land subsidence in areas where routes of leveling measurements are undeveloped, such as mountainous areas. In particular, InSAR-based monitoring around well-developed hot spring resorts, such as those in Japan, is useful for conserving hot spring resources. Hakone Volcano is one of the major hot spring resorts in Japan, and many hot spring wells have been developed in the Owakudani fumarole area, where a small phreatic eruption occurred in 2015. In this study, we performed an InSAR time series analysis using the small baseline subset (SBAS) method and ALOS/PALSAR scenes of the Hakone Volcano to monitor surface displacements around the volcano. The results of the SBAS-InSAR time series analysis show highly localized subsidence to the west of Owakudani from 2006–2011 when the ALOS/PALSAR satellite was operated. The area of subsidence was approximately 500 m in diameter, and the peak rate of subsidence was approximately 30 mm/year. Modeling using a point pressure source suggested that the subsidence was caused by a contraction at approximately 700 m above sea level (about 300 m below the ground surface). The rate of this contraction was estimated to be 1.04 × 104 m3/year. Hot spring water is collected from a nearby well at almost the same depth as the contraction source, and its main dissolved ion component is chloride ions, suggesting that the hydrothermal fluids are supplied from deep within the volcano. The land subsidence suggests that the fumarole activity is attenuating due to a decrease in the supply of hydrothermal fluids from deeper areas.

show abstract

Section: 5-d Analysismentioning

confidence: 78%

Section: 5-d Analysismentioning

confidence: 78%