SURFACE DISPLACEMENT INDUCED BY LIQUEFACTION OF THE 2011 TOHOKU-OKI EARTHQUAKE IN TOKYO BAY AREA USING INSAR ANALYSIS

Abstract

 On March 11th 2011, the Tohoku-Oki earthquake (Mw9.0) was generated along the Japan Trench and triggered a lot of aftershocks. The extent of damage caused by these earthquakes were enormous. One of the damages caused by this earthquake is land subsidence induced by soil liquefaction. Here, we focus on the soil liquefaction at waterfront area along Tokyo bay. In this study area, it was reported that sand boiling as well as soil liquefaction was widely found especially in the artificially filled ground. However it is difficult to reveal quantitative degree of the surface deformation associated with soil liquefaction only using ground-based observation system. Therefore, the goal of this study is to estimate surface deformation induced by the soil liquefaction in this area using Differential Interferometric SAR(DInSAR) analysis. In the result, we succeeded in estimating distribution of the surface deformation associated with liquefaction at the waterfront area and found that surface deformation is not uniformly occurred in the artificially filled ground.