Japan Geoscience Union Meeting 2023

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[J] Oral

S (Solid Earth Sciences ) » S-TT Technology & Techniques

[S-TT42] Applying optic fiber sensing to earth science

Sun. May 21, 2023 10:45 AM - 12:00 PM 304 (International Conference Hall, Makuhari Messe)

convener:Eiichiro Araki(Japan Agency for Marine-Earth Science and Technology), Kentaro Emoto(Graduate School of Science, Kyushu University), Masatoshi Miyazawa(Disaster Prevention Research Institute, Kyoto University), Takeshi Tsuji(Department of Systems Innovation, the University of Tokyo), Chairperson:Takeshi Tsuji(Department of Systems Innovation, the University of Tokyo), Masatoshi Miyazawa(Disaster Prevention Research Institute, Kyoto University)

11:15 AM - 11:30 AM

[STT42-07] DAS observation at Sakurajima volcano in 2022

*Takeshi Nishimura1, Kentaro Emoto2, Haruhisa Nakamichi3, Satoru Hamanaka2, Hisashi Nakahara1, Kimiko Taguchi1 (1.Department of Geophysics, Graduate School of Science, Tohoku University, 2.Institute of Seismology and Volcanology, Graduate School of Science, Kyushu University, 3.Sakurajima Volcano Research Center, DPRI, Kyoto University)

Keywords:DAS, Fiber optic cable, seismic observation, Explosive eruption, Debris flow

We conducted DAS observation at Sakurajima volcano for about one month from November 11 to December 9, 2022. We use ONYX system (Sintera) connecting the two fiber optic cables deployed by Osumi River and National Highway Office, MLIT, Japan: one cable is buried beneath the road surrounding the volcano island with a distance of about 40 km, and another is set along the Nojiri river with a distance of about 4 km. During our observation, about 18 volcanic explosions and eruptions occurred. Artificial seismic experiment was conducted and an earthquake with a magnitude of 4 occurred at a depth of 12 km in the Kagoshima Bay on December 8. Debris flow happened on November 29. In the present study, we report the characteristics of these seismic waves recorded by the DAS system.