Developing Strong Motion Data Platform for Ground-motion Model Project in Japan
Description:
Japan has developed one of the world’s most extensive strong-motion observation networks, significantly expanded after the 1995 Kobe earthquake. Today, seismic intensity data from Japan Meteorological Agency (JMA) and local governments are used for rapid information dissemination and emergency response, while waveform data from multiple public institutions have accumulated since the 1960s. Recent upgrades to the local-government seismic intensity network have enabled real-time distribution of full time-history waveform data, creating new opportunities for data utilization. Despite this rich observational basis, strong-motion data and metadata remain fragmented across institutions, limiting their systematic and integrated use for seismic hazard assessment and earthquake disaster applications.
To address these limitations, we propose the concept of a Strong-Motion Information Infrastructure (SMII) that connects seismic data providers and users through on-demand data registration and access, fostering a sustainable data ecosystem. Based on this concept, Ground-Motion Model Project in Japan (GMM-PJ) was launched in 2025 with the objective of developing GMMs based on a common strong-motion dataset, enabling consistent evaluation of epistemic uncertainty in the National Seismic Hazard Maps for Japan (NSHMJ). In parallel with the launch of GMM-PJ, development of the Japan Strong-Motion Data Platform has been initiated to provide unified system for data integration under the SMII concept. As an initial outcome, a unified dataset, “Flatfile GPJv1” has been constructed from open-access strong motion records, following the K-NET and KiK-net flatfile format. GMM-PJ aims to develop both nation-wide GMMs for NSHMJ applications and targeted models addressing specific PSHA issues.
Session: Advancing Seismic Hazard and Risk Assessment through Multi-Disciplinary Approaches - I
Type: Oral
Date: 4/15/2026
Presentation Time: 11:00 AM (local time)
Presenting Author: Asako Iwaki
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Asako Iwaki Presenting Author Corresponding Author iwaki@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Nobuyuki Morikawa morikawa@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Yuma Matsumoto yuma.matsumoto@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Ryuta Imai rimai@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Shinichi Akiyama akiyama@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Wataru Suzuki wsuzuki@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Hisahiko Kubo hkubo@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Shigeki Senna senna@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Shinichi Kawai kawai@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience |
Hiromitsu Nakamura manta@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience, Tsukuba, , Japan |
Hiroyuki Fujiwara fujiwara@bosai.go.jp National Research Institute for Earth Science and Disaster Resilience, Tsukuba, , Japan |
Developing Strong Motion Data Platform for Ground-motion Model Project in Japan
Category
Advancing Seismic Hazard and Risk Assessment through Multi-Disciplinary Approaches