Observation of surface deformation on Mt. Baekdu stratovolcano using SBAS DInSAR technique
Sang-Wan Kim(1), Joong-Sun Won(2), Xinjian Shan(3) and Wooil M. Moon(4,5)
(1) Sejong University, Dept Geoinformation Engineering, 98 Gunja-Dong, Gwangjin-Gu, Seoul 143-747, Korea
(2) Yonsei University, Dept of Earth System Sciences, 134 Shinchon-Dong, Seodaemun-Gu, Seoul 120-749, Korea
(3) China Earthquake Administration, Institute of Geology, Beijing, China
(4) Seoul National University, School of Earth and Environmental Sciences, Research Institute of Oceanography, Seoul 151-742, Korea
(5) Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
Mt. Baekdu is a Cenozoic stratovolcano located on the border between China and North Korea. A series of micro-seismic events and gaseous emissions have been reported recently. JERS-1 (paths 88 and 89) and ALOS (path 425) SAR data sets were used to detect surface deformation possibly caused by the volcano-tectonic activities associated with Mt. Baekdu for a 16-year period (from 1992 to 2008). Two-pass DInSAR technique using SRTM 3-arc digital elevation model was basically applied to detect possible displacement. Most distinctive phase variations in differential interferogram seem to be caused by atmospheric delay. SBAS is one of most appropriate methods for monitoring the temporal evolution of surface deformation, subsequently mitigating the atmospheric effect. Two independent sets (JERS-1 and ALOS data) were used for SBAS analysis due to a large hiatus in data acquisition from October 1998 to September 2006 between two satellite observations. In addition, a number of corner reflectors were installed to both calibrate radiometrically, if necessary, and to accommodate precise radar measurements at geometrically, at selected optimized locations. GPS observations have also been made at these locations and several adjacent areas to observe subtle ground deformation around this volcano. We will present two SBAS time series results from SAR measurement and finally it will compare with GPS measurement.