Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS14] Geohazards in humid, tectonically active countries and their precursors

Mon. May 27, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Masahiro Chigira(Disaster Prevention Research Institute, Kyoto University), Hiroshi YAGI(Faculty of Art, Science and Education, Yamagata University), Satoru Kojima(Department of Civil Engineering, Gifu University), Taro Uchida(National Institute for Land and Infrastructure Management)

[HDS14-P08] Relationship of the grand deformation and topography in Sapporo City at the 2018 Hokkaido Eastern Iburi Earthquake confirmed by InSAR analysis

*Akihiro Yokota1, Tomohiro Nishimura2, Kiyoyuki Shigeno1, Kenichi Honda2, Sakae Mukoyama2 (1.Meiji Consultant Co., Ltd, 2.Kokusai Kogyo Co., Ltd)

Keywords:Interferometric SAR, Ground displacement, 2018 Hokkaido Eastern Iburi Earthquake

In the 2018 Hokkaido Eastern Iburi Earthquake, ground displacement and building damage occurred extensively. It is thought that it is important to promptly grasp the damage caused by a natural disaster in order to advance disaster reduction. In this study, the results of SAR analysis using Sentinel - 1 satellite were investigated for validity and cause using interpretation of aerial photograph and field survey.

As a result of SAR analysis, displacement was observed in Satozuka・Utsukushigaoka・Kiyota, Kiyota Ward, Hiragishi, Toyohira Ward, and Fushiko・Naebo, Higashi Ward in Sapporo City. For these districts, I performed an investigation by the local survey and aerial photo reading.

As a result of investigation, the spot that ground movement produced confirmed that I agreed with the spot where big displacement was estimated on InSAR analysis. The correlation with the old topography and the Embankment place is high in the ground change confirmed this time

It was revealed that I could grasp the damage situation of the wide area in a short time by using the inSAR data with the, Sentinel-1 satellite about the ground damage after the 2018 Hokkaido Eastern Iburi Earthquake.