The characteristics of the terrain is characterized by mountains of Chiang Mai complex is suitable for the construction of the reservoir. Clarifier overflow dam, but this area is located in a county that is at risk from an earthquake impact, because there are many which move beyond the damage caused by the earthquake to affect the structure of the dam. Using the analysis of the damage caused by the use of element the element together with the estimated value of the acceleration that occurs in the area from thonphlangngan, which is the model to reduce the relationship between acceleration with distance. The size of the earthquake and lessons of natural vibration characteristics of sources, including earthquakes and geological conditions. This research is intended to select a model that is appropriate for the thonphlangngan to reduce the estimated value of the maximum acceleration at the surface that would affect the structure of the dam. Using data from the device accelerometer (Accelerometer) earthquake that measured from complete leverage mom dam lakes are characterized by soil reclamation dam (Earth Dam Zone) segment height 59 m long, 9 m wide dam 1,950 meters and is capable of a maximum water retention 26.5 million cubic meters compared to the event.Earthquake bridge district, Chiang Rai province When violence flares 2557 May 5 6.3 by Ric thonphlangngan reduction model used in the study are as follows: Abrahamson and Silva (1997), et al (1997). Sadigh, et al (1990). Dahle and Idriss (2008) a summary of this research is the model of Sadigh et al. (1997) as the most appropriate model because the acceleration is reduced depending on the distance and the condition of the soil in the area, geological, and compared the accuracy of maximum acceleration value between the value obtained from the measurements, with analysis from measurement stations found to have similar values.
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