Analysis of Deformation Field Characteristics from the 2016 Kumamoto Mw 7.1 Earthquake Based on Multisource Remote Sensing Technology

The Kumamoto earthquake is analyzed, mainly on the basis of InSAR data combined with strong earthquake and GNSS data, using a variety of joint InSAR methods and multisource data solution methods and by comprehensively considering the normalization and weighting of multisource data. The three-dimensional (3D) deformation field is determined. The results show that the joint solution with multisource data can improve the accuracy of the 3D solution deformation results to a certain extent. According to the 3D solution results, the maximum east–west deformation caused by the 2016 Kumamoto earthquake was approximately 2 m; the manifestations in the north–south direction were mainly characterized by expansion and stretching; the northwestern side subsided vertically, with a maximum subsidence of 2 m; and the southeastern side was uplifted. The horizontal deformation characteristics reveal that the earthquake was dominated by right-lateral strike-slip; the strike was NE–SW oriented, and the Futagawa fault has several normal fault properties. By analyzing the co-seismic 3D deformation field, seismogenic faults can be better understood, which provides a foundation for studying seismic mechanisms.