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We use ALOS\/PALSAR interferometric synthetic aperture radar (InSAR) images to measure surface deformation from February 2007 to January 2011. We model the observed preeruption inflation and coeruption deflation using Mogi and prolate spheroid sources to infer volume changes of the magma chamber. We interpret that the inflation was due to magma accumulation in a shallow reservoir beneath Mount Sinabung and attribute the deflation due to magma withdrawal from the shallow reservoir during the eruption as well as thermoelastic compaction of erupted material. The pyroclastic flow extent during the eruption is then derived from the LAHARZ model based on the coeruption volume from InSAR modeling and compared to that derived from the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) image. The pyroclastic flow inundation extents between the two different methods agree at about 86%, suggesting the capability of mapping pyroclastic flow inundation by combing radar and optical imagery as well as flow modeling.<\/jats:p>","DOI":"10.1155\/2018\/8217565","type":"journal-article","created":{"date-parts":[[2018,3,19]],"date-time":"2018-03-19T19:32:39Z","timestamp":1521487959000},"page":"1-12","source":"Crossref","is-referenced-by-count":1,"title":["Mapping Pyroclastic Flow Inundation Using Radar and Optical Satellite Images and Lahar Modeling"],"prefix":"10.1155","volume":"2018","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7235-3225","authenticated-orcid":true,"given":"Chang-Wook","family":"Lee","sequence":"first","affiliation":[{"name":"Division of Science Education, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of 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