The 2025 SSJ Fall Meeting
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Poster session (Oct. 20th)Special session : S23. Toward Understanding the Generation Mechanisms of Earthquake Swarms

[P23]Toward Understanding the Generation Mechanisms of Earthquake Swarms

Mon. Oct 20, 2025 5:15 PM - 7:00 PM JST
Mon. Oct 20, 2025 8:15 AM - 10:00 AM UTC
Room P23 (502+503)(502+503)

[P23-01]Deep earthquake swarm in northern Yamaguchi Prefecture

*Yoko Kono1, Aitaro Kato1 (1. Earthquake Research Institute, University of Tokyo)

[P23-02]Campaign Observation of the 2025 Northern Yamaguchi Earthquake Swarm and Regional Crustal Structure

*Kengo Mizushiri1, Momoka Yamashita1, Naofumi Aso1 (1. Tokyo University of Science)

[P23-03]Determination of Focal Mechanisms of a Deep Earthquake Swarm in Northern Yamaguchi Prefecture

*Kazutoshi IMANISHI1, Yuta Amezawa1, Masatoshi Miyazawa2, Tomoaki Nishikawa2, Takuya Nishimura2, Airi Nagaoka2, Rintaro Miyamachi2, Shiro Ohmi2 (1. Geological Survey of Japan, AIST, 2. DPRI, Kyoto University)

[P23-04]Episodic transient deformation observed around the Abu volcano group, Yamaguchi Prefecture

*Takuya NISHIMURA1, Masatoshi Miyazawa1, Tomoaki Nishikawa1, Airi Nagaoka1, Rintaro Miyamachi1, Yusaku Ohta2, Hiroaki Takahashi3, Mako Ohzono3 (1. Kyoto University, 2. Tohoku University, 3. Hokkaido University)

[P23-05]First-Motion Mechanism of Deep Low-Frequency Earthquakes in Eastern Shimane

*Momoka Yamashita1, Naofumi Aso1 (1. Tokyo University of Science)

[P23-06]Focal mechanism estimation at the offshore source area of the 2024 Noto Peninsula earthquake using dense OBS data

*Tsutomu TAKAHASHI1, Gou FUJIE1, Tetsuo NO1, Masanao SHINOHARA2, Tomoaki YAMADA1, Takeshi AKUHARA1 (1. JAMSTEC, 2. Earthquake Research Institute, The University of Tokyo)

[P23-07]Temporal variation in background seismic intensity and hypocenter migration indicating fluid intrusion and diffusion

*Fuyuki HIROSE1, Masaki Nakamura1 (1. Seismology and Tsunami Research Department, Meteorological Research Institute)

[P23-08]Swarm earthquake activity in Hakone volcano occured at the sourthern part of Lake Ashi in July 2025 - Comparison with previous activities-

*Ryo KURIHARA1, Ryou Honda1, Tsukasa Kobayashi1, Yuki Abe1, Kazuhiro Naganawa1 (1. Hot Springs Research Institute of Kanagawa Prefecture)

[P23-09]Continuous tremor found in seismograms observed near Akusekijima Island

*Takanori MATSUZAWA1, Youichi Asano1, Hiroshi Yakiwara2, Shuichiro Hirano2, Yukihiro Nakatani2 (1. National Research Institute for Earth Science and Disaster Resilience, 2. Kagoshima University)

[P23-10]Repeated tremors around the Akusekijima, Tokara Islands

*Yusuke YAMASHITA1, Hiroshi Yakiwara2, Yukihiro Nakatani3, Shuichiro Hirano2 (1. Regional Cooperation and Disaster Mitigation Research Center, Miyazaki Municipal University, 2. Graduate School of Science and Engineering, Kagoshima University, 3. Nansei-Touko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering, Kagoshima University)

[P23-11]Features of Seismic Activity near the Tokara Islands in 2025 from the F-net Moment Tensor Catalog

*Takeshi KIMURA1, Takayuki MIYOSHI1 (1. NIED)

[P23-12]Spatiotemporal Distribution and Migration of Earthquake Swarms near the Ryukyu Trench Axis off Southeastern Okinoerabu Island

*Mamoru NAKAMURA1,2 (1. Faculty of Science, University of the Ryukyus, 2. Disaster Prevention Research Center for Island Region, University of the Ryukyus)

[P23-13]Systematic Analysis of Source Time Functions of Mw 7–9 Earthquakes: Role of Cascade Rupture in Earthquake Growth

*Keisuke Yoshida YOSHIDA1, Shiro Hirano2 (1. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University, 2. Graduate School of Science and Technology, Hirosaki University)

[P23-14]Repeating earthquake swarms following bursts of shallow tectonic tremor near the Japan Trench, Off Fukushima

*Shukei OHYANAGI1,3, Kazuaki OHTA2, Yoshihiro ITO3, Ryota HINO4 (1. Kyoto Univ., Graduate School of Science, 2. NIED, 3. Kyoto Univ., Disaster Prevention Research Institute, 4. Tohoku Univ.)
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