Report of activity

Abstract of the 226th meeting of CCEP

  The 226th meeting of the Coordinating Committee for Earthquake Prediction (CCEP) was held at the Kanto Regional Survey Department of the GSI on Feb. 21, 2020. Firstly, nationwide monitoring data of seismic activities and crustal deformaitons were reported. Secondary, CCEP members discussed the intensive discussion subject "Inland large earthquakes without apparent surface fault traces." Finally, the purport of next intensive discussion subject "Future vision for monitoring of crustal activity around Japan" was explained.

  • Deliberation about crusutal activity monitoring.
  • 1.1 General crustal activities
    (1) Seismic activities of Japan
           p3 (JMA)
    (2) Activities of shallow and very-low-frequency earthquakes around Japan
           p4 (NIED)
    (3) Strain changes in Japanese Islands
           p5 (GSI)

    1.2 Stuck state of plate boundary and its change
    (1) Suruga trough, Nankai trough and Nansei islands trench
           pp6-9 (NIED)
           pp10-13 (GSI)

    1.3 Others
    (1) Earthquake in the northern Soya Region (Dec. 12, 2019 M4.2)
           p14 (JMA)
    (2) Earthquake eastward offshore of the Aomori Prefecture (Dec. 19, 2019 M5.5)
           p15 (JMA)

  • Inland large earthquakes without apparent surface fault traces
           p17 Convener: Hiroaki Takahashi(Hokkaido University)
  • -Characteristics of inland earthquakes without surface faults
           p19 Hiroaki Takahashi (Hokkaido University)
    -How many M~7 sources are hidden in the upper crust:
     Earthquakes do not leave surface rupture,
     earthquakes leave short-lived surface rupture,
     and surface-rupturing faults without their own earthquakes
           p20-21 Shinji Toda (Tohoku University)
    -Seismic source model for predicting strong motions from second-stage earthquakes  based on mechanical model
           p22-24 Kazuo Dan (Shimizu Corporation)
    -Towards a new model for assessing seismic risk in the overriding plate
           p25 Hiroshi Sato (ERI)