[S-SS11] Active faults and paleoseismology

[SSS11-P11] Trial of the Japanese Community Fault Model

*Ryosuke Ando¹, Takashi Azuma³, Towako Aoyama⁵, Seiya Maehara¹, Genki Watanuki³, Hannu Seebeck², Howell Andy^4,2, Tim McLennan⁶, CFM working group (1.Graduate School of Science, University of Tokyo, 2.GNS Science, 3.Geological Survey of Japan, 4.Canterbury University, 5.Earthquake Research Institute, University of Tokyo, 6.Seequent)

Keywords:Fault Geometry, Active Fault

3D fault geometry models are developed and opened in several regions, including Southern California and New Zealand (NZ), based on the community effort and consensus called the Community Fault Model (CFM). CFMs are supposed to be used for strong motion calculation and south physics modeling and are evaluated openly by the scientific community and updated based on the latest observational constraints. We developed a trial version of CFM for 50 faults of the major active faults in Japan. We follow the procedure of the NZ-CFM to develop the fault model (Seebeck, 2022). Firstly, we simplify the fault traces in the existing catalog compiled by the Geological Survey of Japan. Next, we build the 3D geometry of fault surfaces by extending the surface traces with constant dip angles. We used GIS software such as QGIS and ArcGIS to simplify the surface traces and CAD software called Leapfrog to systematically treat the build of the 3D geometry. The developed geometry model will be evaluated by the community this year, and we will continue to develop the model for all major fault systems in Japan of one hundred.