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Report No.

Crustal deformation analysis by using GPS observation data before and after Tohoku-oki Earthquake in northern Hokkaido, Japan

Tokiwa, Tetsuya; Sugimoto, Shingo*

GPS analysis was carried out to understand the characteristics of the crustal deformation due to the Tohoku-oki Earthquake in the northern Hokkaido, Japan. The data period for the analysis is from October 1, 2010 to May 31, 2011. The result of the analysis indicated that the displacement in the direction of the south-southeast was detected in this area, and the amount of displacement of the western side of northern Hokkaido is relatively larger than that of the eastern side. Therefore, the eastern side of northern Hokkaido was displaced to the north with respect to Horonobe area, and the west side was displaced to the south. Although the analysis period is short, the crustal deformation is different from a seismic crustal deformation showing the E-W crustal compression.



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