The application of geosynthetic materials have become one of alternative solution for earth retaining structure. The materials like woven geotextiles and geogrid are combined into one retaining struc-ture system. The geogrid plays as reinforced element and the non-woven plays as separator between the fill material and the existing soil. The geogird are anchored into the compacted soil to create the elements bonding. The length of geosynthetic materials that is anchored in the soil have approximately 0,7 of the height of the retaining structure. On the other hand, in the area which is prone to earthquake like Indonesia which has various value of ground acceleration. The study case is taken from the project experience in Jakarta and West Sumatera where the PGA values are 0,4g and 0,6g. From this value of PGA, the formula of geogrid anchorage 0,7 by the wall height is not sufficient. The variation of peak ground acceleration (PGA) value gives high influence by the change of active pressure coefficient KAE value. The change of active pressure coefficient is increase the length of geosynthetic materials anchorage.
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