2024 年 10 巻 32 号 p. 1206-1211
The Chiang Mai basin, including Chiang Mai City, is among the most economically influential regions in Northern Thailand. The basin lies in a shallow active seismic zone near the Mae Tha faults to the west. The basin's eastern boundaries are defined by north-to-south mountain ranges that align with the direction of river flow. The geological composition of the basin predominantly comprises sand and silt, a result of erosion and sedimentation processes. Following instances of liquefaction hazard in Northern Thailand in 2011 and 2014, researchers undertook assessments of liquefaction susceptibility within the Chiang Mai province. Examination of borehole data indicated the potential for liquefaction in certain Chiang Mai basin locations. This study seeks to utilize a geographic information system (GIS) to visually represent the various subsoil layers within the Chiang Mai basin. Data involving subsoil properties are soil type, geotechnical engineering characteristics, and water levels. In the analysis of liquefaction, surface peak ground acceleration data sourced from prior studies were integrated. The GIS information about Chiang Mai's subsoil layers can be used to formulate a map pinpointing liquefaction-prone area. This map can facilitate the development of proactive mitigation strategies aimed at mitigating the repercussions of earthquake-induced liquefaction hazards within this geographical zone.
