Temporal variation of the Shinmoe-dake crater in the 2011 eruption revealed by spaceborne SAR observations

Ozawa, Taku; Kozono, Tomofumi

doi:10.5047/eps.2013.05.004

Cited by 22 publications

(21 citation statements)

References 8 publications

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“…We therefore assume that the satellite‐ground distance changes in all interferograms are caused by vertical displacements only. The uplifted areas coincide with the location of extruded lava demonstrated by Ozawa and Kozono [], and there is little deformation around the crater. We therefore interpret that the observed continuous uplift of the lava surface indicates a continuous volume increase of lava within the crater.…”

Section: Resultsmentioning

confidence: 99%

“…On 19 January 2011, a small phreatomagmatic eruption started from the Shinmoe-dake crater and developed to sub-Plinian eruptions on 26 and 27 January and then into Vulcanian eruptions [Nakada et al, 2013]. From 27 to 31 January, accumulation of lava within the crater was accompanied by explosive eruptions [Ozawa and Kozono, 2013]. A regional GPS network around the Shinmoe-dake volcano and differential interferometric synthetic aperture radar (DInSAR) observations using Advanced Land Observing Satellite/Phased Array type L-band Synthetic Aperture Radar and RADARSAT-2 indicated preeruptive inflation, coeruptive deflation, and posteruptive inflation associated with the 2011 eruption Ueda et al, 2013].…”

Section: Introductionmentioning

confidence: 99%

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Long‐term lava extrusion after the 2011 Shinmoe‐dake eruption detected by DInSAR observations

Miyagi

Ozawa

Kozono

et al. 2014

Geophysical Research Letters

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In January 2011, the latest eruption began at Shinmoe-dake volcano, Japan, and lava accumulated in the crater. Differential interferometric synthetic aperture radar (DInSAR) observations after the end of main eruption indicated continuous uplift on the lava surface. We estimated the volume increase of lava, and the volume change rate has decreased exponentially. Results from long-term DInSAR processing indicate slow subsidence outside the crater. We interpret that this subsidence is caused by deflation of a shallow source located beneath the crater, which is a reaction to the extrusion of lava. Between November 2011 and May 2013, the total volume of extruded lava within the crater is estimated to be 6.7 ± 0.1 × 10 4 m 3 , which is comparable to the deflation volume of the shallow source. The system is not closed within the shallow source to the crater; thus, long-term lava extrusion can be explained by continuous injection from a deeper source to the shallow source.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long‐term lava extrusion after the 2011 Shinmoe‐dake eruption detected by DInSAR observations

Miyagi

Ozawa

Kozono

et al. 2014

Geophysical Research Letters

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“…Root‐mean‐square values of seismic signals around Shinmoe‐dake increased beginning 18 January 2011 and remained at significant levels after minor eruptive activity on the morning of 26 January 2011. Three sub‐Plinian events occurred between the afternoon of 26 January and the evening of 27 January, followed by accumulation of lava in the crater during 28–31 January [ Ozawa and Kozono , ] with frequent small explosions [ Ichihara et al , ]. Vulcanian explosions occurred on 27 January, just prior to the third sub‐Plinian eruption, and on 28 and 30 January during lava accumulation.…”

Section: Observationsmentioning

confidence: 99%

Seismic and infrasonic eruption tremors and their relation to magma discharge rate: A case study for sub‐Plinian events in the 2011 eruption of Shinmoe‐dake, Japan

Ichihara

2016

JGR Solid Earth

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Magma discharge rate is one of the most important parameters in quantifying volcanic activity. Many previous works have attempted to connect observations of seismic and infrasonic eruption tremors with magma discharge rate. Power law scaling relations with different power indices have been proposed based on various data sets and models. The 2011 eruption of Shinmoe‐dake, Japan, provides an excellent data set with which to investigate these relationships for a sustained explosive eruption sequence. Magma discharge rates are well constrained by geodetic, geologic, and remote sensing methods. Seismic and infrasonic data were recorded close to the vent. Moreover, contributions to ground shaking from infrasound can be distinguished from seismic signals in the seismometer records. As a result, linear power law relationships are found to fit all pairs of variables (seismic eruption tremor power, infrasonic eruption tremor power, and magma discharge rate) in the quasi‐stable or slowly growing stages of the sub‐Plinian events. Similar relations have been reported for other eruptions but only between seismic eruption tremors and magma discharge rate or between seismic and infrasonic eruption tremors. Existing models do not fully explain the observed relationships. The possibility is proposed that Plinian‐type eruptions generate both seismic and infrasonic eruption tremors by successive explosions at the fragmentation surface in the conduit; these linear relationships can therefore be observed only under conditions where flow and fragmentation in the conduit are stable.

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“…The eruption commenced with a small phreatomagmatic event followed by subplinian events on 26 and 27 January 2011 [27][28][29]. Lava emerged as a dome in the summit crater on 27 January 2011, observed by SAR [30][31][32], and a small mound of lava was confirmed by aerial observation [33]. The mound is developed by a 500-m radius on 29 January.…”

Section: Shinmoedake Volcanomentioning

confidence: 99%

Detection of Thermal Changes Related to the 2011 Shinmoedake Volcano Activity, Japan: Spatiotemporal Variation of Singularity of MODIS Data after Discriminating False Changes Due to Cloud

et al. 2020

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We proposed a cloud discrimination method applicable in Japan using MODIS nighttime data, monitored the singularity of the spatiotemporal correlation of surface temperature anomalies and investigated the possibility of detecting and monitoring lava activity in Shinmoedake. With the aim to detect lava eruption activity in 2011, nine years of data from 2003 to 2011 were analyzed. As a result, the first anomalous singularity in brightness temperature was detected on 26 January 2011. Moreover, the maximum value was detected on 30 January 2011. The values showed larger ones until early February 2011. When an anomalous singularity appeared, it was the only period with the magma-related volcanic activity for Shinmoedake over the analyzed period of nine years. The above facts indicate the effectiveness of the proposed singularity method to monitor the lava activity for Shinmoedake. Therefore, it is concluded that if cloud discrimination is realized with high accuracy, no spurious changes will come to arise, and no false detection of hotspots will be given.

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Temporal variation of the Shinmoe-dake crater in the 2011 eruption revealed by spaceborne SAR observations

Cited by 22 publications

References 8 publications

Long‐term lava extrusion after the 2011 Shinmoe‐dake eruption detected by DInSAR observations

Long‐term lava extrusion after the 2011 Shinmoe‐dake eruption detected by DInSAR observations

Seismic and infrasonic eruption tremors and their relation to magma discharge rate: A case study for sub‐Plinian events in the 2011 eruption of Shinmoe‐dake, Japan

Detection of Thermal Changes Related to the 2011 Shinmoedake Volcano Activity, Japan: Spatiotemporal Variation of Singularity of MODIS Data after Discriminating False Changes Due to Cloud

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