Sentinel-1による地表変動観測と測地・地球科学における意義

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  • Observation of Ground Deformation with Sentinel-1 and its Significance in Geodesy and Geosciences
  • Sentinel-1 ニ ヨル チヒョウ ヘンドウ カンソク ト ソクチ ・ チキュウ カガク ニ オケル イギ

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<p>Sentinel-1 satellites equipped with C-band synthetic aperture radar are providing invaluable data on the Earth’s surface since the launch of the first satellite in April 2014. Owing to the wide swath of radar and short recurrence interval, researches of crustal deformations associated with earthquake and volcanic eruptions, landslide, land subsidence, etc. have been made in several regions on the Earth. Especially, stable observation with the same configuration enables us to reveal temporal evolution of surface deformations using sophisticated time series analysis. Furthermore, all data are freely available to scientific community, which boosts researches in various fields. So far, however, there are not many studies utilizing Sentinel-1 images in the Japanese community of crustal deformation study. This may be partly because shorter wavelength microwave SAR is inferior to L-band SAR in heavily vegetated area such as Japan, and partly because special techniques are required to process images. In this article I present the overview of the system of Sentinel-1 and its merit and demerit, processing examples and finally give perspectives on research with SAR.</p>

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