By past Warnitchai [1]. thonphlangngan reduction of model studies abroad against the soil in Bangkok and atthapol [2] have studied the reduction equation the same as thonphlangngan, but stressed that the Chiang Mai area.
In the past Warnitchai [1] studied the model of reduced energy consumption compared to foreign soil in Bangkok Atthapol [2] studied for the reduction of energy, but also focus on the areas in Chiang Mai.
The Warnitchai [1] to study energy attenuation models of overseas by compared with the soil in Bangkok and if [2] study energy attenuation equation as well but focus on areas in Chiang Mai