Journal of Environment, 1, (2014), 1–9 Original Paper Monitoring of Merapi Volcano Deformation Using Interferometry Synthetic Aperture Radar (InSAR) Technique Ayu Margaworo Pamungkas a, *, Takahiro Osawa a and I Wayan Sandi Adnyana b a Center for Remote Sensing and Ocean Science (CReSOS), Udayana University, PB Sudirman street, Denpasar, Bali, 80232 Indonesia b Faculty of Agriculture, Udayana University, Bukit Jimbaran, Bali 80361, Indonesia * Corresponding author: Ayu Margaworo Pamungkas; E-Mail: twinsa_u@yahoo.co.id Tel./Fax.: +62 361 256 162 Received: 04 March 2014 / Accepted: 01 October 2014 / Published: 03 October 2014 Abstract: The Merapi volcano is the most active volcano in Indonesia until now, because of eruption occur every two or five years. To minimize the impact of volcanic eruptions need to monitor the volcanic activity, one effort in monitoring is to monitor the surface changes (deformation) around the volcano. These surface changes can be monitored with InSAR technique. In this study monitoring by analyzing the Digital Elevation Model (DEM) and displacement map from result processing using InSAR technique. The accuracy of DEM compare with Shuttle Radar Topography Mission (SRTM) DEM. These results showed that after the eruption in 2006 led to the deflation that occurred in 2007. In 2010 after the eruption led to deflation in some areas of Merapi volcano. Whereas in 2008 due to the absence of volcanic activity that occurred then the deformation is not so large changing. Test on the DEM from the process of InSAR compare with SRTM DEM produced an accuracy of 96%. Keywords: deformation; InSAR; DEM 1. Introduction Indonesia is flanked by 5 plate tectonics, the Asian plate, India plate, Australian plate, Pacific plate, and plates of the Indian Ocean. This condition caused Indonesia has many volcanoes and make the dynamic parts of Indonesia. Indonesia has many volcanoes are still active until now. Volcanology and Geological Hazard Mitigation, Ministry of Energy and Mineral Resources of Indonesia recorded 129 volcanoes about 13% of all volcanoes in the world are in Indonesia. Until recently there were 80 active volcanoes are categorized with the potential to erupt. Volcanoes in Indonesia spread over two main lines Ring of Fire is the circumference of the Mediterranean and the Pacific rim. Distribution