衛星SARデータの差分干渉による能登半島地震に伴う地表面の変動パターン

Aiming to understand surface deformation patterns associated with the 2007 Noto Hanto earthquake, differential interferometry was performed using ALOS PALSAR data acquired on 23 February (before the earthquake) and 10 April, 2007 (after the earthquake). Displacement in the line of sight (LOS) of the radar was mapped through processing steps such as generation of single look complex (SLC) image data, registration of two SLCs, refinement of baseline, and phase unwrapping of differential interferogram. LOS distance after the earthquake was found to decrease in the WNW direction from the Anamizu―Notokashima area, and the maximum reduction of 54cm around Akakami―Kitawakisaki area was analyzed, as well as the increase of the LOS distance up to 5cm in the area of Minazuki through Nishideyama area. Contours of LOS displacement show a pattern like a concentric circle centered several kilometers away to the NW of the Akakami-Kitawakisaki area, which is concordant with the location of the epicenter reported by Japan Meteorological Agency