Research on the deformation monitoring of Changbaishan volcano based on PSInSAR technique

This paper introduces PSInSAR technique for monitoring the deformation of Changbaishan volcano. Two sorts of images, including 19 in the time interval 1992-1998 acquired by JERS-1 SAR sensor and 14 in 2007-2010 acquired by ASAR, are available. The results demonstrate that: the Tianchi volcano had uplifted in the both periods of time. From 1992 to 1998, the Tianchi volcano was active with a mean deformation rate about 6 mm/a in the line of radar sight. By contrast, a lower value as much as 3 mm/a indicated that the volcano was more stable between 2007 and 2010. A significant character can be realized that deformation occurring around the crater lake, maybe caused by magma activity, was larger than the areas away from volcano. The leveling data acquired between 2006 and 2009 were used to validate the PSInSAR results, and it shows they agree well with each other. What's more, because of larger cover in space dimension, the PSInSAR technique could help us better understand the deformation characteristic of Tianchi volcano, and make a good complement to the field survey.