the "TSI" Scale is a way to measure how tall a tsunami is. TSI 1 (Small) TSI 2 (Small TSI3(Moderate) TSI4(Moderate) Hight:1-10 m. Hight:10-25m. Hight:25-50m. Hight:50-75m. TSI5 (High) TSI6 (High) TSI7 (Super) TSI8(Ultra) Hight:75-100m. Hight:100-200m. 200-500m. 500+m.