Abstract of the 251th meeting of CCEP

The 251th meeting of the Coordinating Committee for Earthquake Prediction (CCEP) was held at the Kanto Regional Survey Department of the GSI on May 21, 2026. And the meeting was onsite and online confference. Firstly, the nationwide monitoring data of the seismic activity was reported. Secondary, the CCEP members discussed the intensive discussion subject ”Earthquake Research Utilizing Information Science” was explained.
* The materials on this site are written in Japanese.

１.Regarding the Addition of Members to the 29th Earthquake Prediction Liaison Committee.

Mr. Takashi Ogami of the National Institute of Advanced Industrial Science and Technology, Mr. Shigeki Aoki and Mr. Yutaka Hayashi of the Japan Meteorological Agency have been newly appointed as members of the 29th term of the Earthquake Prediction Liaison Committee.




２.Monitoring Crustal Deformation

２.１ General crustal activities
(1) Seismic activities of Japan. Ⅰ,p.2(JMA)
(2) Strain changes in Japanese Islands. Ⅰ,pp.3-4(GSI)





２.２ State of interplate coupling and its change.
(1) Japan trench,Chishima trench.
　　　Ⅰ,p.5,Ⅰ,pp.6-19(JMA),
　　　Ⅰ,pp.20-26(GSI),
　　　Ⅰ,p.27(JAMSTEC)
(2) Sagami Trough Surroundings / Directly Under the Tokyo Metropolitan Area.
　　　Ⅰ,p.28(JMA),
　　　Ⅰ,pp.29-30(GSI)





(3) Nankai trough and Nansei islands trench.
　　　Ⅰ,p.31(NIED),
　　　Ⅰ,pp.32-35 ,Ⅰ,pp.36-38(GSI)





２.３ Others
(1) Earthquake in the southern Tokachi region (April 27, M6.2)
　　　Ⅰ,p.39(JMA)


(2) Earthquake in the northern part of Nagano Prefecture (largest earthquake: April 18, M5.1)
　　　Ⅰ,p.40(JMA) ,
　　　Ⅰ,pp.41-42(GSI)


(3) Seismic activity northwest of Miyako Island (largest earthquake: March 2, M6.2)
　　　Ⅰ,p.43(JMA),
　　　Ⅰ,pp.44-45(GSI)

(4)Kuril Islands Earthquake (February 22, M6.1)
　　　Ⅰ,p.46(JMA)

(5) Earthquake near Iwo Jima (March 2, M6.2)
　　　Ⅰ,p.47(JMA)




３.Intensive discussion

”Earthquake Research Utilizing Information Science”
　　　Ⅱ,p.2 Convener：Naoshi Hirata (Tokyo Univ.),Hiromichi Nagao(ERI)

-Earthquake Research Utilizing Information Science -Background and Current Status-
　　　Ⅱ,p.4 Hiromichi Nagao(ERI)

-Research and Development of Quasi-Real-Time Spatiotemporal Forecasting of Seismic Activity and Ground-Motion Hazard Following Large Earthquakes under Data Incompleteness
　　　Ⅱ,p.5 Hisahiko Kubo(NIED)

-Slow slip detection and fault slip monitoring using information science
　　　Ⅱ,p.6 Kano Masayuki(DPRI)

-A hypocenter determination system and an ensemble estimation method for subsurface structures in the Nankai Trough region using physics-informed deep learning
　　　Ⅱ,p.7 Ryoichiro Agata(JAMSTEC)

-Seismic Hazard Assessment Using Deep Generative Models: Current Status and Future Perspectives
　　　Ⅱ,p.8 Tatsuya Itoi(Tokyo Univ.Graduate School of Engineering)

４.Purport of next intensive discussion

Eighty Years After the 1946 Showa Nankai Earthquake: Advances in Research and Observations Toward the Next Nankai Trough Earthquake

　Ⅱ,p.9 Convener：Yoshihiro Ito(DPRI),Takane Hori(JAMSTEC)

５.Report of the Operations Working Group

Topics of next 3 times of Intensive discussion has been selected.
　　　Ⅲ Operations Working Group


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