[S-SS04] Seismicity

Tue. May 26, 2026 1:45 PM - 3:15 PM International Conference Room (IC) (International Conference Hall, Makuhari Messe)

Chairperson:Matsu'ura Ritsuko S.(Earthquake Research Center, Association for the Development of Earthquake Prediction), Tamaribuchi Koji(Japan Meteorological Agency)

The objective of this session is to discuss spatio-temporal characteristics and governing mechanisms of seismicity, focusing on earthquake activity as an ensemble rather than as individual events. In addition to case studies on regional characteristics and specific earthquake sequences, this session aims to advance our understanding of the physical and chemical processes that control seismicity. We also welcome presentations addressing interactions among seismic events at various spatio-temporal scales, the boundary conditions that define seismic activity, such as tectonics, geological structures, and thermal regimes, and phenomena associated with earthquake occurrence.

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1:45 PM - 2:00 PM

[SSS04-01] Three Decades of Japan's Unified Earthquake Catalog: Current Advances and Future Directions with AI Technology

*Koji Tamaribuchi¹, Kana Akiyama¹, Kazuhiro Iwakiri¹ (1. Japan Meteorological Agency)

2:00 PM - 2:15 PM

[SSS04-02] Scalable GPU Implementation of Double-Difference Hypocenter Relocation

*Makoto Naoi¹, Kazunori Yoshizawa¹, Keisuke Yoshida² (1. Hokkaido University, 2. Tohoku University)

2:15 PM - 2:30 PM

[SSS04-03] Estimation of the Earthquake Fault Plane Using HypoTD-Derived Hypocenter Distributions Immediately After the Mainshock, and Characteristics of Seismic Activity on the Fault Plane

*Shigeki Horiuchi¹, Masumi Yamada⁴, Minoru Yoshida², Tadakatsu Sato¹, Yuko Sato¹, Toshiko Terakawa⁵, Tetsuo Takanami⁶, Hiroyuki Fujiwara³ (1. Home Seismometer Corporation, 2. Hakusan Corporation, 3. NIED, 4. DPRI, 5. Graduate School of Environmental Studies, Nagoya University, 6. Carnegie Institution for Science)

2:30 PM - 2:45 PM

[SSS04-04] Long-Term b-Value and Seismic Rate from Earthquake Catalogs with Time-Varying Completeness and Uncertain Magnitudes

*Cyrielle Colin¹, Stéphanie Durand¹, Thomas Bodin², Marine Laporte², Guillaume Daniel³, Pierre Arroucau³, David Marsan⁴ (1. Universite Claude Bernard Lyon1 LGL TPE UMR5276 ENS Lyon UJM SaintEtienne CNRS Villeurbanne 69100 France, 2. Instituto de Ciencias del Mar (ICM) - CSIC, Barcelona, Spain, 3. Electricité de France (EDF)-DT-TEGG, Aix-en-Provence, France, 4. Université de Savoie Mont Blanc, Chambéry, France)

2:45 PM - 3:00 PM

[SSS04-05] Earthquake hazard for inland Japan with very shallow depth of M≧6 calculated simply from seismicity data

*Ritsuko S. Matsu'ura¹, Yosihiko Ogata², Takaki Iwata³, Takane Hori⁴, Fuyuki Hirose⁵, Aitaro Kato⁶, Takuya Nishimura⁷ (1. Earthquake Research Center, Association for the Development of Earthquake Prediction, 2. Institute of Statistical Mathematics, 3. Prefectural University of Hiroshima, 4. JAMTEC, 5. Meteorological Research Institute, JMA, 6. Earthquake Research Institute, Univ. of Tokyo, 7. DPRI, Kyoto Univ.)

3:00 PM - 3:15 PM

[SSS04-06] Spatiotemporal analysis of seismicity within tectonic zones in Japan using the ETAS model

*Harumi Uchida¹, Tomomi Okada¹, Ryotaro Fujimura¹, Ayaka Tagami^2,1, Tomoaki Nishikawa³ (1. Tohoku University, 2. Geological Survey of Japan, AIST, 3. Disaster Prevention Research Institute, Kyoto University)

Session information