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Six devastating earthquakes occurred in Indonesia since December 26,2004.The 2004 Aceh earthquake is likely to be one of the greatest earthquakes of this century and killed more than 200,000 people by the resulting Tsunami.Indonesia and close vicinity are located in a region where three large plates interact with each other. Some GPS measurement networks were established in South-east Asia by different countries and institutes.Nevertheless,most of stations of these networks are not measuring crustal deformations continuously,which may actually be useful for possible real-time earthquake hazard assessments. The author has been also utilizing measurements of some GPS networks in Japan, Turkey and Taiwan to identify locations with high earthquake risk and also possibility of predicting earthquakes.The method developed by the author has showed the possibility of identifying such locations as well as predicting the time of earthquakes. In this article, the author utilizes his method to assess the crustal straining in Indonesia with a special emphasis on Sumatra Island for identifying locations with high risk of earthquakes and also its relation to the seismicity of Indonesia.In addition,the possible future offshore thrust or intra -plate strike-slip earthquakes in Sumatra Island and its close vicinity are pointed out and their tsunami potential along the subduction zone in the west of Sumatra Island is also discussed and some recommendations were made.
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