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Journal of Geography (Chigaku Zasshi), 2021 Vol.130 No.6

2021 Vol.130 No.6

Owakudani Today

Hakone volcano is a tourist destination located approximately 100 km west of Tokyo, the capital of Japan, which can be reached within about two hours by road or rail. Owakudani is one of the most popular tourist spots in Hakone, with three million visitors a year. It is also the largest fumarolic area of the volcano. The fumarolic area was ground zero of the 2015 eruption and the fumarole vents seen in this photo were formed during the eruption. Geological investigations revealed that several much larger phreatic eruptions also occurred in the area after the latest magmatic eruption about 3,500 years ago. Consequently, predicting eruptions in Owakudani is an urgent issue because the tourist spot is a potential eruption center. The photo shows Owakudani valley where an eruption occurred in 2015, and which is still venting steam (foreground), the Owakudani tourist area with buildings and parking lots (middle), and Mt. Fuji, which is another tourism resource in this area (back).


(Photograph: Yuji MIYASHITA, date taken: April 26, 2021;
Explanation: Kazutaka MANNEN)


Special Issue: Mechanism of Phreatic Eruptions and Challenges for Eruption Forecasting: Latest Advances and Volcanic Disaster Prevention

Overview of the Special Issue
　“Mechanism of Phreatic Eruptions and Challenges for Eruption Forecasting:
　Latest Advances and Volcanic Disaster Prevention”

Kazutaka MANNEN, Yohei YUKUTAKE,
Ryosuke DOKE and Daiji HIRATA

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 719.

DOI:10.5026/jgeography.130.719

Preface for the Special Issue
　“Mechanism of Phreatic Eruptions and Challenges for Eruption Forecasting:
　Latest Advances and Volcanic Disaster Prevention”

Kazutaka MANNEN, Yohei YUKUTAKE,
Ryosuke DOKE and Daiji HIRATA

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 725.

DOI:10.5026/jgeography.130.725

Observations of Hydrothermal System and Preparatory Process of Phreatic Eruption:
　Recent Developments and Future Prospects (Review Article)

Yohei YUKUTAKE and Kazutaka MANNEN

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 731.

DOI:10.5026/jgeography.130.731

Precursors to the 2015 Eruption of Kuchinoerabujima Volcano
　and Decision Making on Evacuation (Original Article)

Masato IGUCHI

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 755.

DOI:10.5026/jgeography.130.755

Utilizing Thermal Demagnetization Events to Evaluate Volcanic Unrest
　and the Prospects for Eruption Forecasting (Original Article)

Takeshi HASHIMOTO

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 771.

DOI:10.5026/jgeography.130.771

Volcanic Activity Forecast Based on Volcanic Gas Composition
　of Hakone Volcano, Japan: Utilization for Volcanic Disaster Prevention
　(Original Article)

Yasushi DAITA, Takeshi OHBA, Muga YAGUCHI,
Takao SOGO and Masatake HARADA

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 783.

DOI:10.5026/jgeography.130.783

Mechanisms of Steam-blast Eruptions Inferred from the Mineralogy of Volcanic Ash
　(Review Article)

Tsukasa OHBA, Takumi IMURA, Yusuke MINAMI
and Syahreza Saidina ANGKASA

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 797.

DOI:10.5026/jgeography.130.797

Structure of Shallow Hydrothermal System in Hakone Volcano, Japan,
　Inferred from Surface Displacements (Review Article)

Ryosuke DOKE, Kazutaka MANNEN and Kazuhiro ITADERA

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 811.

DOI:10.5026/jgeography.130.811

Magma-hydrothermal System of Hakone Volcano (Review Article)

Kazutaka MANNEN

Journal of Geography (Chigaku Zasshi), 2021, 130(6), 831.

DOI:10.5026/jgeography.130.831

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