Chen et al. (2008) use InSAR to obtain the deformation field in the Changbai Mountains region. They reveal “a 6~12 cm line-of-sight (LOS) deformation in the Jianbai Mountain region from 1995 to 1998, which is located southeast of the Mt. Changbai volcano, but little deformation in the Tianchi volcano region”.
To determine the source geometry and depth of deformation, the authors constrain the models using “GPS derived horizontal velocity field and leveling measurements from 2002 to 2003”.  The find that a “double Mogi source model fits the observations better, with the two Mogi sources located ~7.9 km below the Tianchi volcanic crater, and ~5.5 km below the Jianbai volcanic crater, respectively”.