Deformation monitoring of Changbaishan Tianchi volcano using D-InSAR technique and error analysis

In this study we applied two-pass D-InSAR technique to process 15 JERS-1 SAR data. The final deformation field of Changbaishan Tianchi volcano from 1994 to 1998 was expressed in 3 displacement maps which were obtained from 4 JERS-1 SAR data. The stuty achieves the following; firstly, the flat region far away from the summit of Changbaishan Tianchi volcano shows no obvious deformation; secondly, there is an increasing upward deformation from the foot of the mountain up to the areas at the elevation about 2000 similar to 2200 m, and the maximum uplift rate is 5 mm/a. Although the estimated inflation rate is not confirmed due to the lack of field work data, the results accord with the leveling studies from 2002 to 2005 and the seismic activity between 1994 and 1998. In addition, the largest deformation rate of 5mm/a is close to the result of Kim's study who also applied InSAR technique using several SAR data acquired in the same period. This study extends the deformation monitoring period of Changbaishan Tianchi volcano for several years, and provides more displacement information for future studies.