Masato Iguchi

Kyoto University

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Takeshi Tameguri

Kyoto University

Haruhisa Nakamichi

Kyoto University

Daisuke Miki

Kyoto University

Akihiko Yokoo

Kyoto University

Alexandros P. Poulidis

University of Bremen

Muhamad Hendrasto

Hiroshi Yakiwara

Kagoshima University

Setsuya Nakada

National Research Institute for Earth Science and Disaster Resilience

Takahiro Ohkura

Kyoto University

Keigo Yamamoto

Kyoto University

Cooperative Institutions

Kyoto University

The University of Tokyo

Graduate School USA

Association for the Development of Earthquake Prediction

Tohoku University

Hokkaido University

Earthquake Engineering Research Institute

Meteorological, Climatological, And Geophysical Agency

National Institute of Advanced Industrial Science and Technology

Geological Survey of Japan

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Using infrasound waves from eruption video to explain ground deformation preceding the eruption of Suwanosejima volcano, Japan

Journal of Volcanology and Geothermal Research (2010)

Akihiko Yokoo Masato Iguchi

Microseism

10.1016/j.jvolgeores.2010.08.008

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Citations (16)

In situ Volcano Monitoring

Elsevier eBooks (2014)

Gilberto Saccorotti Masato Iguchi Alessandro Aiuppa

Volcanology

10.1016/b978-0-12-396453-3.00007-1

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Citations (11)

Processes Prior to Outbursts of Vulcanian Eruption at Showa Crater of Sakurajima Volcano(＜Special Section＞Sakurajima Special Issue)

Kazan/Kazan. Dai2shu (2013)

Akihiko Yokoo Masato Iguchi Takeshi Tameguri Keigo Yamamoto

Special section

Section (typography)

Vulcanian eruption

10.18940/kazan.58.1_163

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Citations (28)

Phreatomagmatic eruptions of 2014 and 2015 in Kuchinoerabujima Volcano triggered by a shallow intrusion of magma

Journal of Natural Disaster Science (2016)

Nobuo Geshi Masato Iguchi Hiroshi Shinohara

The 2014 and 2015 eruptions of Kuchinoerabujima Volcano followed a ~15-year precursory activation of the hydrothermal system induced by a magma intrusion event. Continuous heat transfer from the degassing magma body heated the hydrothermal system and the increase of the fluid pressure in the hydrothermal system caused fracturing of the unstable edifice, inducing a phreatic explosion. The 2014 eruption occurred from two fissures that traced the eruption fissures formed in the 1931 eruption. The explosive eruption detonated the hydrothermally-altered materials and part of the intruding magma. The rise of fumarolic activities before the past two activities in 1931-35 and 1966-1980 also suggest activation of the hydrothermal system by magmatic intrusions prior to the eruption. The long-lasting precursory activities in Kuchinoerabujima suggest complex processes of the heat transfer from the magma to the hydrothermal system.

Phreatomagmatic eruption

Phreatic eruption

Phreatic

10.2328/jnds.37.67

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Citations (21)

Tephra segregation profiles from Vulcanian eruptions on Sakurajima volcano, Japan, based on settling velocity observations

Japan Geoscience Union (2020)

Kosei Takishita Masato Iguchi Alexandros P. Poulidis Tadaomi Sonoda

Settling

Vulcanian eruption

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Observations of Volcanic Eruption Columns with Different Types of Weather Radars

Japan Geoscience Union (2019)

Masayuki Maki Takehiko Kobori Yura Kim Yasushi Fujiyoshi Eiichi Sato

Peléan eruption

Vulcanian eruption

Phreatic eruption

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Continuous Monitoring of Ash fall from Showa Crater by Time Series Sampling at Sakurajima Volcano, SW Japan

AGU Fall Meeting Abstracts (2010)

Taketo Shimano Akihiko Yokoo Masato Iguchi Daisuke Miki

Volcanic ash

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Extremely Low Frequency Electrical Monitoring of Persistent Explosive Activity of Minamidake Crater (Sakurajima Volcano, Japan)

AGU Fall Meeting Abstracts (2020)

Caron E. J. Vossen Corrado Cimarelli Alec Bennett André Geisler Damien Gaudin

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Magnitude–frequency distribution of volcanic explosion earthquakes

Earth Planets and Space (2016)

Takeshi Nishimura Masato Iguchi Mohammad Hendrasto Hiroshi Aoyama Taishi Yamada

Magnitude–frequency distributions of volcanic explosion earthquakes that are associated with occurrences of vulcanian and strombolian eruptions, or gas burst activity, are examined at six active volcanoes. The magnitude–frequency distribution at Suwanosejima volcano, Japan, shows a power-law distribution, which implies self-similarity in the system, as is often observed in statistical characteristics of tectonic and volcanic earthquakes. On the other hand, the magnitude–frequency distributions at five other volcanoes, Sakurajima and Tokachi-dake in Japan, Semeru and Lokon in Indonesia, and Stromboli in Italy, are well explained by exponential distributions. The statistical features are considered to reflect source size, as characterized by a volcanic conduit or chamber. Earthquake generation processes associated with vulcanian, strombolian and gas burst events are different from those of eruptions ejecting large amounts of pyroclasts, since the magnitude–frequency distribution of the volcanic explosivity index is generally explained by the power law.

Strombolian eruption

10.1186/s40623-016-0505-2

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Citations (19)

Reexamination of moment tensors for initial motion of explosion earthquakes using borehole seismograms at Sakurajima volcano, Japan

Earth Planets and Space (2014)

Takeshi Tameguri Masato Iguchi Kazuhiro Ishihara

We estimated the seismic moment tensor for the initial phase of explosion earthquakes associated with Vulcanian explosions at the andesitic volcano Sakurajima. We applied a waveform inversion method to 24 events observed with borehole seismometers at 6 stations assuming a single triangular source time function. The three diagonal components representing volumetric change were dominant in the estimated moment tensors. The three diagonal components were positive and had almost the same values with the difference among them less than 10% for most of the explosion earthquakes, while non-diagonal components were negligibly small compared with the diagonal ones. Durations of source time functions had a range of 0.2–0.5 s and seismic moments were 1011 ∼ 1012 Nm. We conclude that the explosion earthquakes are initiated by an isotropic expansion.

Seismogram

Seismometer

Seismic moment

10.1186/bf03352363

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Citations (5)