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The eruption started with a phreatic phase, changed to phreatomagmatic, and then andesite lava appeared at the summit crater in late December 2013. Lava effusion continued and has been associated with partial to complete collapses of the lava complex, which successively generated pyroclastic density currents (PDCs). The lava complex grew first as a lava dome and then developed into a lava flow (lava extension stage). It extended up to about 3 km in horizontal runout distance by late 2014. When the front of the lava complex moved onto the middle and lower slope of the volcano, PDC events were initially replaced by simple rock falls. Inflation of the upper part of the lava complex began in mid-2014 when the movement of the lava flow front stagnated. The inflation was associated with hybrid seismic events and frequent partial collapses of the upper part of the lava complex, generating PDC events with long travel distances. 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  1. 防災科研関係論文

Growth process of the lava dome/flow complex at Sinabung Volcano during 2013–2016

https://nied-repo.bosai.go.jp/records/4333
https://nied-repo.bosai.go.jp/records/4333
cd1ed7d4-7bec-4e75-a40d-a21f4d68947c
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Growth process of the lava dome/flow complex at Sinabung Volcano during 2013–2016
言語
言語 eng
著者 Setsuya Nakada

× Setsuya Nakada

en Setsuya Nakada

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Akhmad Zaennudin

× Akhmad Zaennudin

en Akhmad Zaennudin

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Mitsuhiro Yoshimoto

× Mitsuhiro Yoshimoto

en Mitsuhiro Yoshimoto

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Fukashi Maeno

× Fukashi Maeno

en Fukashi Maeno

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Yuki Suzuki

× Yuki Suzuki

en Yuki Suzuki

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Natsumi Hokanishi

× Natsumi Hokanishi

en Natsumi Hokanishi

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Hisashi Sasaki

× Hisashi Sasaki

en Hisashi Sasaki

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Masato Iguchi

× Masato Iguchi

en Masato Iguchi

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Takahiro Ohkura

× Takahiro Ohkura

en Takahiro Ohkura

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Hendra Gunawan

× Hendra Gunawan

en Hendra Gunawan

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Hetty Triastuty

× Hetty Triastuty

en Hetty Triastuty

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抄録
内容記述タイプ Other
内容記述 © 2017 Elsevier B.V. Mount Sinabung, North Sumatra, Indonesia, erupted for the first time in 2010 and reactivated again in 2013. The eruption started with a phreatic phase, changed to phreatomagmatic, and then andesite lava appeared at the summit crater in late December 2013. Lava effusion continued and has been associated with partial to complete collapses of the lava complex, which successively generated pyroclastic density currents (PDCs). The lava complex grew first as a lava dome and then developed into a lava flow (lava extension stage). It extended up to about 3 km in horizontal runout distance by late 2014. When the front of the lava complex moved onto the middle and lower slope of the volcano, PDC events were initially replaced by simple rock falls. Inflation of the upper part of the lava complex began in mid-2014 when the movement of the lava flow front stagnated. The inflation was associated with hybrid seismic events and frequent partial collapses of the upper part of the lava complex, generating PDC events with long travel distances. From mid-September 2014, new lobes repeatedly appeared near the summit and collapsed. Cyclic vulcanian events began in August 2015 when hybrid events peaked, and continued > 1.5 years (vulcanian stage). These events sometimes triggered PDCs, whose deposits contained vesiculated lava fragments. The distribution of PDC deposits, which extended over time, mostly overlapped in areal extent with that of the 9th–10th century eruption. Eruption volumes were estimated based on measurements with a laser distance meter during 6 periods, digital surface model (DSM) analysis of satellite images during one period, and the cumulative number of seismically detected PDC events, assuming a constant volume of each PDC event. The total volume of eruption products reached about 0.16 km3 DRE as of the end of 2015. The lava discharge rate was largest during the initial stage (> 7 m3/s) and decreased exponentially over time. The discharge rate during the vulcanian stage was ≪ 1 m3/s. The trend of decreasing discharge rate is in harmony with that of ground deflation recorded by a GPS measurement. The chemical composition of lava slightly evolved with time. Cyclic vulcanian events may have been triggered by limited degassing conditions in the upper conduit and by unloading of the conduit by lava dome collapses.
言語 en
書誌情報 en : Journal of Volcanology and Geothermal Research

巻 382, p. 120-136
出版者
言語 en
出版者 ELSEVIER
ISSN
収録物識別子タイプ EISSN
収録物識別子 1872-6097
DOI
関連識別子 10.1016/j.jvolgeores.2017.06.012
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