Abstract of the 239th meeting of CCEP

The 239th meeting of the Coordinating Committee for Earthquake Prediction (CCEP) was held at the Kanto Regional Survey Department of the GSI on May 31, 2023. And the meeting was onsite and online confference. Firstly, the nationwide monitoring data of the seismic activity and the crustal deformations and prediction of crustal activity were reported. Secondary, the CCEP members discussed the intensive discussion subject "Earthquake swarm" was explained. Finally, the purport of next intensive discussion subject "Centennial of Kanto earthquake" was explained.

※The materials on this site are written in Japanese.

• Organization of the 28th CCEP.

Prof. Yamaoka of Nagoya University was elected as the new chairman. Then, Prof. Yamaoka designated Prof. Obara (Tokyo Univ.) and Prof. Takahashi (Hokkaido Univ.) as the vice-chairman, and Prof. Takahashi as the leader of steering subcommittee.


• Deliberation about crustal activity monitoring.

2.1 General crustal activities
(1) Seismic activities of Japan.
p3 (JMA)
(2) Activities of shallow and very-low-frequency earthquakes around Japan.
p4-5 (NIED)
(3) Strain changes in Japanese Islands.
p6 (GSI)

2.2 State of interplate coupling and its change.
(1)Japan trench,Chishima trench
p7 (JMA)
(2)Nankai trough and Nansei islands trench.
p8-9 (NIED)
p10(GSI),
p11(GSI),
p12(GSI),
p13(JMA),
p14(GSI),

2.3 Others
(1) Earthquake in off the coast of Kushiro,Hokkaido Prefecture(Feb.25)
p15 (JMA)
(2) Seismic activity in Noto region, Ishikawa Prefecture.
p16-18 (JMA)
p19-29 (GSI)
(3) Earthquake in south of Chiba Prefecture.(May. 11)
p30 (JMA)

2.4 Earthquakes in Turkey on February 6, 2023 (UTC)
p31-33 (JMA)

2.5 Prediction of crustal activity
(1) prediction of crustal activity - Earthquake forecasting by using the seismic intensity database of Japan Meteorological Agency (Evaluation of forecast results for 2022 and update of occurrence probability values)
p36 (Univ.Shiga Pref.)
(2) prediction of crustal activity - Space-time features of the Noto Peninsula swarm activity and the May 5, 2023 earthquake
p37-39 (ISM)



• Intensive discussion "Earthquake swarm".

p41 Convener：Kazutoshi Imanishi (AIST)

-A long-lasting seismic activity in the northeastern Noto Peninsula
p43 Yoshihiro Hiramatsu (Kanazawa University)
-Current Status of 3-D resistivity structure analysis around earthquake swarm region in the Northeastern Noto Peninsula
p44 Ryokei Yoshimura (Disaster Prevention Research Institute, Kyoto University)
-Earthquake swarm near the border between Nagano and Gifu prefectures in 2020
p45 Aitaro Kato (Earthquake Research Institute, The University of Tokyo)
-Seismic swarm activity and shallow slow slip inferred from dense GNSS network in northern Hokkaido, Japan
p46 Mako Ohzono (Hokkaido University)
-Acoustic emission activity induced by fluid injection in the laboratory experiment
p47 Makoto Naoi (Disaster Prevention Research Institute, Kyoto University)

• Upcoming "Centennial of Kanto earthquake"

p48 Convener：Kenji Satake (Earthquake Research Institute,The University of Tokyo)

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