Surface deformation monitoring using SAR interferograms and GPS observables: Application to Tokyo, Japan

This paper presents a method to monitor surface deformations using SAR interferometry and GPS observables. In this analysis we used least squares to reduce the errors presented in InSAR deformation maps temporally then we used a GPS based spatial phase filtering to spatially filter the estimated deformation maps. This method can generate crustal deformation time series with geodetic accuracy using only 10 interferograms and few operational GPS stations. The proposed method was tested on Tokyo bay area, Japan which has been affected by the 2011 Tohoku earthquake. The results were verified against deformations detected by GPS stations showing a mean standard deviation of 7.9 millimeters.