@article{565ec91e736b42609ea9f072d1bb7dc6,
title = "A dense GPS observation immediately after the 2004 mid-Niigata prefecture earthquake",
abstract = "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.",
author = "Hiroaki Takahashi and Takeshi Matsushima and Teruyuki Kato and Akira Takeuchi and Teruhiro Yamaguchi and Yuhki Kohno and Takeshi Katagi and Jun'ichi Fukuda and Kazuya Hatamoto and Ryousuke Doke and Yuki Matsu'ura and Minoru Kasahara",
note = "Funding Information: Acknowledgments. We are grateful to the staff of schools, local governments and farmers cooperative who permitted us to install GPS receivers. Makiko Iwakuni at University of Tokyo, Sayaka Uchiumi and Yasuko Shimizu at Tokai University help us to collect observation data. We are thankful to Prof. N. Hi-rata and anonymous reviewer for their constructive comments, and Prof. Y. Nishida for proofreading. We obtained GPS RINEX data from Geographical Survey Institute of Japan, which is appreciated. Focal mechanism data in Fig. 1 were from JMA{\textquoteright}s home page (http://www.jma.go.jp). Hypocenter data in Fig. 1 were quickly determined by JMA in cooperation with the Ministry of Education, Culture, Sports, Science and Technology (MEXT) to analyze seismic wave data provided by cooperative organizations, that is Hokkaido Univ., Hirosaki Univ., Tohoku Univ., University of Tokyo, Nagoya Univ., Kyoto Univ., Kochi Univ., Kyushu Univ., Kagoshima Univ., National Research Institute for Earth Science and Disaster Prevention, National Institute of Advanced Industrial Science and Technology, the Tokyo Metropolitan Government, Shizuoka Prefecture, Hot Springs Research Institute of Kanagawa Prefecture, Yokohama City, Geographical Survey Institute and Japan Marine Science and Technology Center. This research is supported by the New Program for Earthquake Predic- tion Research and Observation, and Grand-in-Aid for Scientific Research (representative; N. Hirata) of MEXT of Japan Government. Figures were partially drawn using GMT software (Wessel and Smith, 1995).",
year = "2005",
doi = "10.1186/BF03351844",
language = "English",
volume = "57",
pages = "661--665",
journal = "Earth, Planets and Space",
issn = "1343-8832",
publisher = "Terra Scientific Publishing Company",
number = "7",
}