Minor surface displacement caused by the Kumamoto earthquake detected by DInSAR

Abstract

The LC-InSAR map by DInSAR showed a large number of ‘phase discontinuous lines' at locations other than the main trace of the surface rapture caused by the Kumamoto earthquakes. On the Line of this ‘phase discontinuous line', many places where minute surface displacement was observed were found. Most of the ‘phase discontinuity lines' are thought to represent minor surface displacements caused by the Kumamoto earthquake. It is considered that such a minor displacement was difficult to find out only by the field survey after the earthquake because the displacement was too small. It was confirmed that the LC-InSAR map is effective for detecting minute surface displacement.