[S-CG60] Shallow Fault Zone Structure and Seismic Hazard Assessment

[SCG60-05] Fault Zone Structure in Shallow Depth and Seismic Hazard Assessment: Scope of This Session

*Kimiyuki Asano¹, Tanaka Shinya², Ken Miyakoshi³, Hiroe Miyake⁴ (1.Disaster Prevention Research Institute, Kyoto University, 2.Tokyo Electric Power Services CO., Ltd., 3.Ohsaki Research Institute, Inc., 4.Earthquake Research Institute, University of Tokyo)

The importance of continuous high-density strong-motion observations has been recognized, and efforts have been made by relevant organizations to develop and maintain strong-motion seismic observation networks in many countries. After the destructive damage along the surface faults during the 2016 Kumamoto earthquake, Japan, the effects of the shallow portion of the source fault above the seismogenic zone on the near-fault ground motions and fault displacements have drawn attention among research communities working on seismic hazard studies. Recent progress in studies for detailed geometry, structure, and physical properties in the shallow depth along the earthquake fault zone enables us to understand physical generation mechanism of ground motion and fault displacements in the near-fault area and to develop sophisticated methods for their quantitative evaluation.
Since discussions and method development have progressed in the communities of seismology and earthquake engineering regarding these topics, and we proposed this session because we would like to have an opportunity for open discussions. In recent years, strong-motion earthquake records near the source fault have been obtained and analyzed also by high-density strong-motion observation networks in the 2022 Taitung earthquake and the 2023 Southern Turkey earthquake.
This session is proposed to gather findings related to the science of earthquake hazard assessment near active faults, including analysis and modelling studies of these damaging earthquakes in Japan and abroad, and examples of research for the prediction of seismic motion and fault displacement hazard for earthquakes occurring on active faults, and to discuss current achievements and future challenges. We hope to present research findings and discuss new perspectives from a wide range of disciplines related to seismic hazard assessment and fault displacement hazard assessment, including strong-motion seismology, earthquake source physics, active fault research, earthquake engineering and geophysical exploration. For this purpose, we invite as invited speakers Professor Shinji Toda of the International Research Institute of Disaster Science, Tohoku University, who is at the forefront of seismic hazard assessment related to active faults, and Professor Kazuo Dan of Kumamoto University, who has long been successful in both practical and research aspects of strong ground motion prediction.