A Novel Approach for Improving Liquefaction Hazard Maps in Reclaimed Land

Reference No.	2025a047
Type/Category	Grant for General Research-Workshop（Ⅰ）
Title of Research Project	A Novel Approach for Improving Liquefaction Hazard Maps in Reclaimed Land
Principal Investigator	Hemanta Hazarika（Department of Civil Engineering, Graduate School of Engineering・Professor）
Research Period	October 31,2025. - November 2,2025.
Keyword(s) of Research Fields	2024 Noto Peninsula Earthquake, Lateral Spreading, In-Situ Testing, Liquefaction Hazard Map, Numerical Analysis
Abstract for Research Report	Currently, the liquefaction hazard maps published by local governments are based on limited subsurface data, which is a major weakness. While it is possible to create these maps through extensive borehole surveys, this approach incurs enormous costs. Therefore, this study aims to significantly improve the existing liquefaction hazard maps by modeling data obtained from low-cost in-situ tests using AI. Specifically, we propose a method for integrating individual models obtained from multiple locations. Additionally, we will validate the effectiveness and versatility of the proposed method through comparisons with machine learning techniques, such as neural networks. Verification using real-world data will also be conducted to confirm the specific effectiveness of the approach. Furthermore, it is crucial to incorporate the risk of damage due to lateral spreading into the hazard map. To this end, we will attempt to create a new "Lateral Spreading Hazard Map." The originality of this study lies in establishing an innovative methodology that utilizes statistical theory, constructing a flexible statistical model that captures ground heterogeneity while enabling highly accurate predictions, and creating a new liquefaction hazard map for the target area. In the reconstruction plan for Uchinada Town, which was affected by the disaster, a liquefaction hazard map that includes the risk of lateral spreading is indispensable. We aim to explain the ground risk of the area to residents, facilitate consensus-building between the public and private sectors, and contribute to disaster prevention and mitigation. Through these collaborations, we will establish a foundation for sustainable innovation, opening the path for the application of the Uchinada Town model to similar regions across Japan. Ultimately, the findings of this study will provide new guidelines for enhancing the safety and stability of infrastructural facilities in anticipation of future large-scale earthquakes, highlighting the significance of this research.
Organizing Committee Members (Workshop) Participants (Short-term Joint Usage)	Masanori Murai（Shimizu Corporation, Tokyo・Chief Engineer） Shiro Ohta（Kawasaki Geological Engineering Co., Ltd., Tokyo・Senior Managing Director） Shotaro Kubota（Kawasaki Geological Engineering Co., Ltd., Tokyo・Researcher） Yuji Michi（Yoshimitsugumi Inc., Komatsu・Representative Director） Takashi Fujishiro（GeoDisaster Prevention Institute, Kitakyushu・Director） Tomohiro Ishizawa（National Research Institute for Earth Science and Disaster Resilience (NIED), Tsukuba・Principal Researcher） Tsuyoshi Tanaka（Tokyo City University, Tokyo・Technical Officer） Anurag Sahare（Tokyo City University, Tokyo・Research Assistant Professor） Takayoshi Inukai（Zeta Sekkei Inc., Nagoya・Managing Director） Kei Hiroshi（IMI, Kyushu University・Professor） Yasuhide Fukumoto（IMI, Kyushu University・Professor Emeritus）