In this research study the equation to reduce thonphlangngan from the research of Nutapong's equation [2] reduction of soil thonphlangngan in Chiang Mai by the most suitable equation per DIN MAI is the equation of Abrahamson and Silva (2008) [4], where a replica of Abrahamson and Silva (2008) as one of the Group's model, the model developed from the NGA Abrahamson and Silva (1997) used the data of the NGA has a pattern more complex model equations for maximum acceleration at the center value of the land surface. These equations 1
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