Correction of tropospheric phase delay in time series InSAR using WRF model for monitoring Shinmoedake volcano

One of difficulties in measuring the ground deformation using SAR interferometry is the atmospheric phase screen (APS). Severe stratified APS could occur in mountain region. Thus APS could compromise the accuracy of the ground deformation estimated by SAR interferometry in stratovolcano. Since the stratified APS is correlated with the elevation, both ground deformation and APS error are indistinguishable. In order to improve the accuracy of the ground deformation and estimate the accurate APS involved in SAR interferogram, the effective algorithm is necessary which reflect the properties of APS in space and time. In this research we proposed a time-series approach combined with the weather prediction model. The main concept about APS is that the severe stratified APS usually occur in mountain region correlating with elevation and has the seasonality, while the turbulent APS has a random process in time and space. On basis of these temporal and spatial properties, we applied the troposphere-corrected time-series interferometry and successfully extracted both APS and estimated the better ground deformation results than a conventional time-series analysis.