Study of long-period ground motion amplification in Bangkok Basin during the 2025 earthquake, analyzing site characteristics, dynamic responses of tall buildings, period elongation due to stiffness loss, and structural health monitoring results. Authors: Nakhorn Poovarodom, Amorntep Jirasakjamroonsri, Kyawt Tin Zar Ko, Pakkapong Likhitsuwan. Presented at TSER2025.