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Interseismic crustal deformation in and around the Atotsugawa fault system, central Japan, detected by InSAR and GNSS

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タイトル: Interseismic crustal deformation in and around the Atotsugawa fault system, central Japan, detected by InSAR and GNSS
著者: Takada, Youichiro 著作を一覧する
Sagiya, Takeshi 著作を一覧する
Nishimura, Takuya 著作を一覧する
キーワード: InSAR
GNSS
Atotsugawa fault
Interseismic velocity
発行日: 2018年 2月16日
出版者: Springer
誌名: Earth, planets and space
巻: 70
開始ページ: 32
出版社 DOI: 10.1186/s40623-018-0801-0
抄録: The Atotsugawa fault system is one of the best-known active faults in Japan. However, revealing the interseismic velocity field in and around the Atotsugawa fault system with high spatial resolution is challenging because of dense vegetation, steep topography, and heavy snowfall in winter. To overcome these difficulties, we combined ALOS/PALSAR data and GNSS data from our original stations in addition to the nationwide station network (GEONET). First, we removed the height-dependent phase change in each interferogram using a digital elevation model. Next, we removed the long-wavelength phase trend using the GNSS velocity field. Finally, we applied an InSAR time-series analysis, known as small baseline subset analysis (SBAS), to all the corrected interferograms. The resultant mean velocity field shows a remarkable phase gradient around the Atostugawa fault system. We found a sharp velocity gradient across the Ushikubi fault, a major strand of the Atotsugawa faults system, rather than the main trace of the Atotsugawa fault. Using InSAR, we found that the interseismic deformation inside the strain concentration zone is spatially heterogeneous and different from what we expect from the fault traces.
資料タイプ: article
URI: http://hdl.handle.net/2115/68823
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 高田 陽一郎

 

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