Volume change of the magma reservoir relating to the 2011 Kirishima Shinmoe-dake eruption—Charging, discharging and recharging process inferred from GPS measurements

Nakao, Shigeru; Morita, Yoshinori; Yakiwara, Hiroshi; Oikawa, Jun; Ueda, Hitoshi; Takahashi, Hiroaki; Ohta, Yusaku; Matsushima, Takeshi; Iguchi, Masato

doi:10.5047/eps.2013.05.017

Cited by 50 publications

(88 citation statements)

References 21 publications

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“…We deny effect of changing vent locations, as they were almost the same as previous vulcanian stage (e.g. Nakada et al, 2013). Progressive alteration is supported by the crater photo (Fig.…”

Section: Variation Of Particle Size Distributionmentioning

confidence: 84%

“…The data sets, such as presence and absence of juvenile material, morphology of juvenile material and particle size distribution, partly constrain some eruptive stages proposed in Nakada et al (2013). Furthermore, we show that the bulk ash composition and free-crystal ash component change at the onset of magmatic eruption in January 2011, because of the contrast between newly erupting magma and past ejecta supplying accessory material.…”

Section: Introductionmentioning

confidence: 88%

“…The following descriptions of the 2011 eruptive activity are based on JMA (Japan Meteorological Agency) reports and Nakada et al (2013), except where indicated. Time is in Japan standard time (JST).…”

Section: Shinmoe-dake 2011 Eruption and Its Backgroundmentioning

confidence: 99%

“…In December 2009, inflation of the volcanic edifice began to accelerate, accompanying activation of seismicity (Oikawa et al, 2011;Yakiwara et al, 2011). GPS data analyses by different groups, which were carried out after the January 2011 eruptions, commonly attributed the inflation to a spherical source 7.5 km deep (GIAJ, 2012) or 9.2 km deep (Nakao et al, 2013) and 7-8 km NW of Shinmoe-dake.…”

Section: Shinmoe-dake 2011 Eruption and Its Backgroundmentioning

confidence: 99%

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Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano—insights from ash samples

et al. 2013

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Section: Variation Of Particle Size Distributionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 88%

Section: Shinmoe-dake 2011 Eruption and Its Backgroundmentioning

confidence: 99%

Section: Shinmoe-dake 2011 Eruption and Its Backgroundmentioning

confidence: 99%

See 2 more Smart Citations

Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano—insights from ash samples

et al. 2013

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“…Crustal deformation associated with the eruption was observed with GPS and tiltmeters, and the data are interpreted as the volumetric decrease of a magma chamber located about 7 km to the northwest of the crater (the star in Fig. 1) at a depth of 8-10 km below sea level Nakao et al, 2013;Ueda et al, 2013). The main eruptive activity started with 3 subplinian eruptions on the 26th and 27th of January 2011, and was followed by emplacement of lava in the crater from the 28th to the 31st.…”

Section: Introductionmentioning

confidence: 99%

Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

2013

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This paper reports a sequence of harmonic tremor observed during the 2011 eruption of Shinmoe-dake volcano, Kyushu, Japan. The main eruptive activity started with subplinian eruptions, followed by lava effusion. Harmonic tremor was observed as seismic waves during the final stage of the effusive eruption. The tremor observed at this stage had unclear and fluctuating harmonic modes. In the atmosphere, however, many impulsive acoustic waves indicating small surface explosions were observed. When effusion stopped and explosive degassing began, harmonic tremor was observed as acoustic waves in the air and in the seismic data, and the harmonic modes became clearer and more stable. This transition in the character of the harmonic tremor coincided with rapid deflation of the lava that had accumulated in the crater. Based on these observations, and laboratory experiments reproducing the features of the wave fields, it is concluded that the harmonic tremor sequence at Shinmoe-dake was generated by gas flowing through channels in the gradually solidifying lava. Comparing our results with the few cases of similar transition observed at other volcanoes, we expect that the transition indicates changes in magma rheology and degassing conditions in the crater, and therefore of changes in eruptive activity.

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Three‐dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data

et al. 2014

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Broadband magnetotelluric (MT) measurements were conducted in 2010 and 2011 in the vicinity of Shinmoe-dake Volcano in the Kirishima volcano group, Japan, where sub-Plinian eruptions took place 3 times during 26-27 January 2011. By combining the new observations with previous MT data, it is found that an anomalous phase in excess of 90°is commonly observed in the northern sector of the Kirishima volcano group. Because the anomalous phase is not explained by 1-D or 2-D structure with isotropic resistivity media, 3-D inversions were performed. By applying small errors to the anomalous phase, we successfully estimated a 3-D resistivity structure that explains not only the normal data but also the anomalous phase data. The final model shows a vertical conductor that is located between a deep-seated conductive body (at a depth greater than 10 km) and a shallow conductive layer. By applying the findings of geophysical and petrological studies of the 2011 sub-Plinian eruptions, we infer that the subvertical conductor represents a zone of hydrothermal aqueous fluids at temperatures over 400°C, in which a magma pathway (interconnected melt) is partially and occasionally formed before magmatic eruptions. To the north of the deep conductor, earthquake swarms occurred from 1968 to 1969, suggesting that these earthquakes were caused by volcanic fluids.

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Volume change of the magma reservoir relating to the 2011 Kirishima Shinmoe-dake eruption—Charging, discharging and recharging process inferred from GPS measurements

Cited by 50 publications

References 21 publications

Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano—insights from ash samples

Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano—insights from ash samples

Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

Three‐dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data

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