Abstract of the 240th meeting of CCEP

The 240th meeting of the Coordinating Committee for Earthquake Prediction (CCEP) was held at the Kanto Regional Survey Department of the GSI on August 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 "Centennial of Kanto earthquake" was explained. Finally, the purport of next intensive discussion subject "Trials of experimental forecasts of crustal deformation and seismicity #9: Validation of intermediate-term seismicity forecasts " was explained.
※The materials on this site are written in Japanese.

• Deliberation about crustal activity monitoring.

1.1 General crustal activities
(1) Seismic activities of Japan.
p2 (JMA)
(2) Activities of shallow and very-low-frequency earthquakes around Japan.
p3-4 (NIED)
(3) Strain changes in Japanese Islands.
p5 (GSI)





1.2 State of interplate coupling and its change.
(1)Japan trench,Chishima trench
p6 (JMA),
p7 (GSI)
(2)Nankai trough and Nansei islands trench.
p8-9 (NIED),
p10(GSI),
p11(GSI)





1.3 Others
(1) Earthquake off the coast of Tomakomai,Hokkaido Prefecture.(Jun.11)
p12 (JMA)
(2) Seismic activity in the Noto region, Ishikawa Prefecture.(May.5)
p13 (JMA),
p14-22 (GSI),
p23-24 (ISM)
(3) Earthquake in south of Chiba Prefecture.(May.11)
p25 (JMA)
(4) Seismic activity near Niijima and Kozushima.(May.22)
p26 (JMA),
p27 (GSI)
(5) Seismic activity near the Tokara Islands (near Kuchinoshima and Nakanoshima).(May.13)
p28-29 (JMA)
(6) Seismic activity near Okinawa main island.(May.1)
p30 (JMA)
(7) Earthquake near Iwo-to.(May.30)
p31 (JMA)
(8) Earthquake in the northern Sea of Japan.(Jun.28)
p32 (JMA)






1.4 Prediction of crustal activity
(1) Prediction of crustal activity - Post-seismic deformation of The 2011 off the Pacific coast of Tohoku Earthquake
p34 (GSI)




• Intensive discussion - Examination of the "Centennial of Kanto earthquake".

p36 Convener：Kenji Satake(ERI)

-The tectonic plate structure and seismicity beneath the Kanto region
p38 Naoshi Hirata (The University of Tokyo)




-Crustal deformation at and after the 1923 Kanto earthquake based on geodetic measurements- Coseismic slip, interplate coupling, and slow slip events –
p39 Takuya Nishimura (Kyoto University)




-The 1923 Great Kanto Earthquake Disaster and its strong ground motions in the southern Kanto district
p40 Takafumi Moroi (J-POWER Design Co., Ltd.)




-Re-Estimating a Source Model for the 1923 Kanto Eartquake by Joint Inversion of Tsunami Waveforms and Coseismic Deformation Data
p41 Yuichiro Tanioka(Hokkaido University)




-Reevaluation of the History of the Kanto Earthquake
p42 Masanobu Shishikura (National Institute of Advanced Industrial Science and Technology)

• Purport of next intensive discussion "Trials of experimental forecasts of crustal deformation and seismicity #9: Validation of intermediate-term seismicity forecasts".

p43-44 Convener：Shinji Toda(International Research Institute of Disaster Science,Tohoku University),Takane Hori(JAMSTEC: Japan Agency for Marine-Earth Science and Technology)

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