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Towards forecasting phreatic eruptions: Examples from Hakone volcano and some global equivalents

Edited by: Kazutaka Mannen, Diana Roman, Graham Leonard, Stephanie Prejean, Mitsuhiro Nakagawa

Hakone volcano, located 100 km west of Tokyo, Japan, is a hot spring resort area and one of the most popular tourism destinations in the country, with over 20 million visitors every year from all around the world. Although there is no historical record of eruption prior to 2015, frequent and intense earthquake swarms have occurred beneath the volcano. The 2015 eruption was a small phreatic eruption and only 100 tons of fine ash was released. However, precursory unrest began two months before the eruption and the entire precursory sequence was monitored in detail using densely distributed seismic and geodetic instruments. This special issue aims to compile multidisciplinary observations and understanding of this eruption and volcanic system and similar volcanoes worldwide to provide a basis for volcano monitoring and hazard mitigation in hydrothermal-prone volcanoes.

  1. Content type: Express Letter

    Global navigation satellite system data from Hakone volcano, central Japan, together with GEONET data from the Geospatial Information Authority of Japan, were used to investigate the processes associated with ...

    Authors: Masatake Harada, Ryosuke Doke, Kazutaka Mannen, Kazuhiro Itadera and Mikio Satomura

    Citation: Earth, Planets and Space 2018 70:152

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  2. Content type: Full paper

    The 2015 unrest of the Hakone volcano in Japan, which began on April 26, generated earthquake swarms accompanied by long-term deformation. The earthquake swarm activity reached its maximum in mid-May and gradu...

    Authors: Ryou Honda, Yohei Yukutake, Yuichi Morita, Shin’ichi Sakai, Kazuhiro Itadera and Kazuya Kokubo

    Citation: Earth, Planets and Space 2018 70:117

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  3. Content type: Full paper

    In association with the September 2014 phreatic eruption (VEI 1–2) at Ontake Volcano, a syn-eruptive and two post-eruptive lahars occurred in the Akagawa–Nigorigawa River, southern flank of the volcano. The pr...

    Authors: Kyoko S. Kataoka, Takane Matsumoto, Takeshi Saito, Katsuhisa Kawashima, Yoshitaka Nagahashi, Tsutomu Iyobe, Akihiko Sasaki and Keisuke Suzuki

    Citation: Earth, Planets and Space 2018 70:113

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  4. Content type: Full paper

    We investigate a volcanic hydrothermal system using numerical simulations, focusing on change in crater temperature. Both increases and decreases in crater temperature have been observed before phreatic erupti...

    Authors: Ryo Tanaka, Takeshi Hashimoto, Nobuo Matsushima and Tsuneo Ishido

    Citation: Earth, Planets and Space 2018 70:72

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  5. Content type: Full paper

    The 2015 eruption of Hakone volcano was a very small phreatic eruption, with total erupted ash estimated to be in the order of only 102 m3 and ballistic blocks reaching less than 30 m from the vent. Precursors, ...

    Authors: Kazutaka Mannen, Yohei Yukutake, George Kikugawa, Masatake Harada, Kazuhiro Itadera and Jun Takenaka

    Citation: Earth, Planets and Space 2018 70:68

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  6. Content type: Express Letter

    On 29 June 2015, a small phreatic eruption occurred at Hakone volcano, Central Japan, forming several vents in the Owakudani geothermal area on the northern slope of the central cones. Intense earthquake swarm...

    Authors: Ryokei Yoshimura, Yasuo Ogawa, Yohei Yukutake, Wataru Kanda, Shogo Komori, Hideaki Hase, Tada-nori Goto, Ryou Honda, Masatake Harada, Tomoya Yamazaki, Masato Kamo, Shingo Kawasaki, Tetsuya Higa, Takeshi Suzuki, Yojiro Yasuda, Masanori Tani…

    Citation: Earth, Planets and Space 2018 70:66

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  7. Content type: Full paper

    Although the 2015 Hakone Volcano eruption was a small-scale phreatic eruption with a discharged mass of only about 100 tons, interferometric synthetic aperture radar successfully detected surface deformations ...

    Authors: Ryosuke Doke, Masatake Harada, Kazutaka Mannen, Kazuhiro Itadera and Jun Takenaka

    Citation: Earth, Planets and Space 2018 70:63

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  8. Content type: Full paper

    In the present study, we analyze the seismic signals from a continuous volcanic tremor that occurred during a small phreatic eruption of the Hakone volcano, in the Owakudani geothermal region of central Japan,...

    Authors: Yohei Yukutake, Ryou Honda, Masatake Harada, Ryosuke Doke, Tatsuhiko Saito, Tomotake Ueno, Shin’ichi Sakai and Yuichi Morita

    Citation: Earth, Planets and Space 2017 69:164

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