A dense GPS observation immediately after the 2004 mid-Niigata prefecture earthquake

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• 作者：Hiroaki Takahashi ; Takeshi Matsushima ; Teruyuki Kato&#8230
• 关键词：The 2004 mid ; Niigata prefecture earthquake ; GPS ; postseismic deformation ; fault model ; aseismic slip
• 刊名：Earth, Planets and Space
• 出版年：2005
• 出版时间：July 2005
• 年：2005
• 卷：57
• 期：7
• 页码：661-665
• 全文大小：371KB
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• 作者单位：Hiroaki Takahashi (19)
  Takeshi Matsushima (29)
  Teruyuki Kato (39)
  Akira Takeuchi (49)
  Teruhiro Yamaguchi (19)
  Yuhki Kohno (29)
  Takeshi Katagi (29)
  Jun鈥檌chi Fukuda (39)
  Kazuya Hatamoto (49)
  Ryousuke Doke (49)
  Yuki Matsu鈥檜ra (49)
  Minoru Kasahara (19)
  
  19. Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan
  29. Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Shimabara, 855-0843, Japan
  39. Earthquake Research Institute, University of Tokyo, Tokyo, 113-0032, Japan
  49. Department of Earth Sciences, Toyama University, Toyama, 930-8550, Japan
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

To investigate the postseismic crustal deformation associated with the 2004 mid-Niigata prefecture earthquake (M6.8), we newly started GPS observation to fill a gap of the nationwide continuous GPS network. Our GPS sites were mainly distributed in the focal region without permanent GPS site, and succeeded in obtaining the postseismic deformation. Coseismic displacements of two aftershocks were clearly detected because of immediate observation. Estimated fault parameters of the aftershock (M5.9) on November 8 occurring just beneath our GPS network indicated that geodetic data could be explained by either east- or west-dipping fault model inferred from detailed aftershock data. Moreover, clear postseismic deformation, which could be characterized by a logarithmic decay function, was observed. This signal probably suggests possible aseismic slip. Our results indicated that dense GPS observation could give important and interesting data to clarify the properties of shallow inland middle-size earthquakes. Key words The 2004 mid-Niigata prefecture earthquake GPS postseismic deformation fault model aseismic slip