Postseismic deformation following the 2016 Kumamoto earthquake detected by ALOS-2/PALSAR-2

• Material Type: 記事
• Title: Postseismic deformation following the 2016 Kumamoto earthquake detected by ALOS-2/PALSAR-2
• Author/Editor: Manabu Hashimoto
• Publication, Distribution, etc.: 日本 : Springer Nature
• Publication Date: 2020-10-20
• Publication Date (W3CDTF): 2020-10-20
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 72(154)
• Volume: 72(154)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-020-01285-0; https://doi.org/10.1186/s40623-020-01285-0
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• Periodical Title (URI): https://earth-planets-space.springeropen.com/articles
• Periodical Title (Persistent ID (NDL)): info:ndljp/pid/11467692; https://dl.ndl.go.jp/pid/11467692
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• Summary, etc.: I have been conducting a study of postseismic deformation following the 2016 Kumamoto earthquake using ALOS-2/PALSAR-2 acquired till 2018. I apply ionospheric correction to interferograms of ALOS-2/PALSAR-2. L-band SAR gives us high coherence enough to reveal surface deformation even in vegetated or mountainous area for pairs of images acquired more than 2 years. Postseismic deformation following the Kumamoto earthquake exceeds 10 cm during 2 years at some spots in and around Kumamoto city and Aso caldera. Westward motion of ~ 6 cm/year was dominant on the southeast side of the Hinagu fault, while westward shift was detected on both sides of the Futagawa fault. The area of latter deformation seems to have correlation with distribution of pyroclastic flow deposits. Significant uplift was found around the eastern Futagawa fault and on the southwestern frank of Aso caldera, whose rate reaches 4 cm/year. There are sharp changes across several coseismic surface ruptures such as Futagawa, Hinagu, and Idenokuchi faults. Rapid subsidence between Futagawa and Idenokuchi faults also found. It is confirmed that local subsidence continued along the Suizenji fault, which newly appeared during the mainshock in Kumamoto City. Subsidence with westward shift of up to 4 cm/year was also found in Aso caldera. Time constant of postseismic decay ranges from 1 month to 600 days at selected points, but that postseismic deformation during the first epochs or two is dominant at point in the Kumamoto Plain. This result suggests multiple source of deformation. Westward motion around the Hinagu fault may be explained with right lateral afterslip on the shallow part of this fault. Subsidence along the Suizenji fault can be attributed to normal faulting on dipping westward. Deformation around the Hinagu and Idenokuchi faults cannot be explained with right lateral afterslip of Futagawa fault, which requires other sources. Deformation in northern part of Aso caldera might be the result of right lateral afterslip on a possible buried fault.
• DOI: 10.1186/s40623-020-01285-0; https://doi.org/10.1186/s40623-020-01285-0; 10.21203/rs.3.rs-20711/v1; https://doi.org/10.21203/rs.3.rs-20711/v1; 10.21203/rs.3.rs-20711/v3; https://doi.org/10.21203/rs.3.rs-20711/v3; 10.21203/rs.3.rs-20711/v2; https://doi.org/10.21203/rs.3.rs-20711/v2
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• Related Material (URI): http://hdl.handle.net/2433/255844; http://id.ndl.go.jp/digimeta/11616239; https://dl.ndl.go.jp/pid/11616239; https://link.springer.com/content/pdf/10.1186/s40623-020-01285-0.pdf; https://link.springer.com/article/10.1186/s40623-020-01285-0/fulltext.html
• Is Referenced By: Development of InSAR Neutral Atmospheric Delay Correction Model by Use of GNSS ZTD and Its Horizontal Gradient; https://cir.nii.ac.jp/crid/1050294285900281216; Using interferometric synthetic aperture rader (InSAR) analysis to detect ground deformation related to irreversibly changing ground ice, Mongolia; https://cir.nii.ac.jp/crid/1360584341808451456; 2016年熊本地震で益城町の低地に生じた並走断層群を横断する反射法地震探査; https://cir.nii.ac.jp/crid/1390019512864674432; 2016年熊本地震と布田川断層，地震地質災害; https://cir.nii.ac.jp/crid/1390587506250862080
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• Bibliographic ID (NDL): 11616239; http://id.ndl.go.jp/bib/11616239