Takao Ohminato

Seismic Monitoring and S-wave Velocity Structure Analysis of the Hunga Volcano with Distributed Acoustic Sensing on an Active Telecommunication Cable

Shunsuke Nakao, Mie Ichihara, Masaru Nakano, Taaniela Kula et autres

Monitoring submarine volcanoes is critical for mitigating volcanic disasters, as highlighted by the large 2022 eruption of the Hunga volcano. However, seafloor seismic observations using Ocean Bottom Seismometers (OBS) face challenges in cost and real-time data transmission. This study tests out volcano …

us, jp, cn, to, au (code pays fourni par la source)

DAS observations of oceanic volcanism with a Tonga seafloor cable: challenges and future perspectives

Mie Ichihara, Shunsuke Nakao, Masaru Nakano, Rennie Vaiomounga et autres

Eruptions may occur at poorly instrumented volcanoes. In the case of submarine volcanoes, the rapid installation of monitoring systems is almost impossible, even though both scientific and societal demands are very high. When the Hunga volcano, a submarine volcano in Tonga, produced …

us, jp, to, cn (code pays fourni par la source)

OH Airglow for Ionospheric Seismology Applications—From Instrumental Noise Characterization to Rayleigh Waves Detection Threshold

Pierre-Yves Froissart, Pierre Simoneau, Kiwamu Nishida, Takao Ohminato

Abstract Airglow layers are powerful tracers of upper‐atmosphere dynamics because of their sensitivity to a broad spectrum of atmospheric wave phenomena. Seismic activity, and in particular Rayleigh waves, constitutes a forcing mechanism capable of generating infrasonic waves in the atmosphere. These seismically …

fr, jp, us (code pays fourni par la source)

Seismic Background Level (SBL) for Monitoring Active Volcanoes

Mie Ichihara, Yohei Yukutake, Tsukasa Kobayashi, Nataliya Galina et autres

Seismological methods are the most widely used for monitoring active volcanoes. While conventional methods focusing on noticeable events (e.g., event counting, classification, and integrating powers) are frequently useful and are being advanced with modern analysis techniques, there are cases of eruptions where …

jp (code pays fourni par la source)

突発災害時の初動調査体制のさらなる強化および継続的調査研究の支援

Takao Ohminato

自然災害科学に関わる研究者・ステークホルダーとの協働による総合防災学の活用と国際展開に関する研究

Takao Ohminato

OH Airglow for Ionospheric Seismology Applications from Instrumental Noise Characterization to Rayleigh Waves Detection Threshold

Pierre-Yves Froissart, Philippe Lognonné, Pierre Simoneau, Kiwamu Nishida et autres

This dataset contains OH airglow images acquired above Japan on 25 February 2024, along with modeling results of a seismic-wave signature in the airglow layer (dI/I). The two image time series are stored in an HDF5 file, and an accompanying README provides …

fr, us (code pays fourni par la source)

Ground Deformation at Asama Volcano Measured by Geodetic Data

Yosuke Aoki, Minoru Takeo, Takao Ohminato, Yutaka Nagaoka et autres

jp, cn (code pays fourni par la source)

Magma Pathway of Asama Volcano

Yosuke Aoki, Minoru Takeo, Takao Ohminato, Yutaka Nagaoka et autres

jp (code pays fourni par la source)

Magma migration beneath the active craters of Sakurajima volcano before the 2023 eruption of Showa crater inferred from ground deformation and muon monitoring

László Oláh, Haruhisa Nakamichi, Takao Ohminato, Hiroyuki K. M. Tanaka et autres

Abstract Ground deformation source modeling and muographic mass density monitoring were applied for studying the plumbing system of Sakurajima volcano, Kyusu Japan using data collected by Interferometric Synthetic Aperture Radar and Sakurajima Muography Observatory. Lateral movement of ground deformation source was observed …

hu, jp (code pays fourni par la source)

Erratum to Automated Classification of Volcanic Earthquakes Using Transformer Encoders: Insights into Data Quality and Model Interpretability

Yoshimasa Suzuki, Yohei Yukutake, Takao Ohminato, Masami Yamasaki et autres

jp, us (code pays fourni par la source)

Characterizing thermal transitions of the 2018 Shinmoe-dake eruption in Japan using Himawari-8 high-frequency infrared imagery and seismic data

Takayuki Kaneko, Mie Ichihara, Atsushi Yasuda, Takao Ohminato et autres

Abstract Discrete explosive eruptions, including vulcanian eruptions, occur at various stages during the effusion of viscous lava. However, the differences in occurrence time and mechanisms are not yet well understood or categorized. We investigated high-frequency Himawari-8 infrared data and seismic data for …

jp (code pays fourni par la source)