Displacement fields around the Fuji and Izu-Oshima volcanoes based on InSAR analysis of the Sentinel-1 satellite data

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  • Sentinel-1衛星データのInSAR解析に基づく富士山・伊豆大島周辺の地表変位場

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Abstract

Interferometric Synthetic Aperture Radar (InSAR) can produce an image of detailed crustal deformation without any surface observation point. A SAR satellite, Sentinel-1, developed by the European Space Agency (ESA) has performed frequent observations of the same regions with C-band microwaves. In the present study, we investigate recent crustal deformations of two volcanic regions in Japan, i.e. Mt. Fuji and Izu-Oshima Island, using data acquired by Sentinel-1. First, a comparison of the InSAR time-series data (more than 20 times a year on average) with the Global Navigation Satellite System (GNSS) time-series data, at the coordinates of each GNSS station, confirmed close similarities between displacement rates (trends) of the InSAR and GNSS data around Mt. Fuji, although the InSAR data tend to include some apparent annual variation. Then, we applied a decomposition method to the InSAR data into two directions: East-West and Up-Down. For Mt. Fuji, the boundary where the direction of the displacement rates is changing, corresponds approximately to the strike of the dike in the subsurface. For Izu-Oshima Island, the data point out a faster deformation in the eastern part of the island, however, whether it is a true signal or not remains to be clarified.

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