Application of the Japan Meteorological Agency Intensity Scale for Long-Period Ground Motion to analyze Bangkok ground motion characteristics during the 2025 Mandalay earthquake, identifying Class 3 motions with dominant periods around 6 seconds. Authors: Yoshihisa Maruyama, Fumio Yamazaki, Teraphan Ornthammarath, Pennung Warnitchai. Presented at TSER2025.