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Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced by a dense GPS network
Earth, Planets and Space volume 60, pages 1197–1201 (2008)
A large earthquake of Mj 7.2 occurred on June 14, 2008, beneath the border between Iwate and Miyagi prefectures in northeastern Japan. We propose a simple rectangular fault model based on a dense GPS network, including continuous GPS sites run by four agencies, to describe the coseismic deformation. The coseismic displacements are estimated by kinematic PPP (precise point positioning) analysis. Near the hypocenter, colocated independent instruments (integrated accelerogram and kinematic PPP) measure the same large displacement caused by the mainshock. The fault model explains the observations well and reproduces the observed complex spatial pattern, especially around the northern part of the focal area, which is the focus of a debate on whether or not the coseismic slip occurred on the Dedana fault system. Our results show that no major slip on the Dedana fault system occurred. The estimated amount of moment release was equivalent to Mw 6.9, and the maximum slip reached 3.5 m on the southern sub-fault.
Advanced Industrial Science and Technology, the headquarters for Earthquake Research Promotion, 11 July 2008, 2008 (in Japanese with an English abstract).
Dow, J., R. Neilan, and G. Gendt, The international GPS service (IGS): celebrating the 10th anniversary and looking to the next decade, Adv. Space Res., 36(3), 320–326, 2005.
Group for the aftershock observations of the Iwate-Miyagi Nairiku Earthquake in 2008 (GIMNE2008), the headquarters for Earthquake Research Promotion, 24 July 2008, 2008 (in Japanese with an English abstract).
Hasegawa, T., S. Hori, T. Hasegawa, K. Kasahara, S. Horiuchi, and J. Koyama, On the focal mechanism of the Southeastern Akita Earthquake in 1970, J. Seismol. Soc. Jpn., 27, 302–312, 1974 (in Japanese with an English abstract).
Hasegawa, A., K. Kasahara, T. Hasegawa, and S. Hori, On the focal mechanism of the Southeastern Akita Earthquake in 1970 (2), J. Seismol. Soc. Jpn., 28, 141–151, 1975 (in Japanese with an English abstract).
Hatanaka, Y., Improvement of the Analysis Strategy of GEONET, Bull. Geogr. Surv. Inst., 49, March, 2003.
Kouba, J., Measuring seismic waves induced by large earthquakes with GPS, Stud. Geophys. Geodyn., 47(4), 741–755, 2003.
Larson, K., P. Bodin, and J. Gomberg, Using 1-Hz GPS Data to Measure Deformations Caused by the Denali Fault Earthquake, Science, 300, 30 May, 2003.
Matsuda, T., H. Yamazaki, T. Nakata, and T. Imaizumi, The surface faulting associated with Riku-u earthquake of 1896, Bull. Earthq. Res. Inst. Tokyo Univ., 55, 795–855, 1980 (in Japanese with an English abstract).
Miura, S., S. Ueki, T. Sato, K. Tachibana, and H. Hamaguchi, Crustal deformation associated with the 1998 seismo-volcanic crisis of Iwate Volcano, Northeastern Japan, as observed by a dense GPS network, Earth Planets Space, 52, 1003–1008, 2000.
Miura, S., T. Sato, K. Tachibana, Y. Satake, and A. Hasegawa, Strain accumulation in and around Ou Backbone range, northeastern Japan as obsered by a dense GPS network, Earth Planets Space, 54, 1071–1076, 2002.
Miura, S., T. Sato, A. Hasegawa, Y. Suwa, K. Tachibana, and S. Yui, Strain concentration zone along the volcanic front derived by GPS observations in NE Japan arc, Earth Planets Space, 56, 1347–1355, 2004.
Miura, S., T. Iinuma, S. Yui, N. Uchida, T. Sato, K. Tachibana, and A. Hasegawa, Co-and post-seismic slip associated with the 2005 Miyagioki earthquake (M7.2) as inferred from GPS data, Earth Planets Space, 58, 1567–1572, 2006.
Miyazaki, S. and K. M. Larson, Coseismic and early postseismic slip for the 2003 Tokachi-oki earthquake sequence inferred from GPS data, Geophys. Res. Lett., 35, L04302, doi:10.1029/2007GL032309, 2008.
NIED, http://www.hinet.bosai.go.jp/topics/iwate-miyagi080614//topics/iwate-miyagi080614/, 2008.
Okada, Y., Internal deformation due to shear and tensile faults in a halfspace, Bull. Seismol. Soc. Am., 82, 1018–1040, 1992.
Ohta, Y., I. Meilano, T. Sagiya, F. Kimata, and K. Hirahara, Large surface wave of the 2004 Sumatra-Andaman earthquake captured by the very long baseline kinematic analysis of 1-Hz GPS data, Earth Planets Space, 58, 153–157, 2006.
Takasu, T., High-rate Precise Point Positioning: Detection of crustal deformation by using 1-Hz GPS data, GPS/GNSS Symposium 2006, Tokyo, 2006.
Takasu, T. and S. Kasai, Development of Precise Orbit/Clock Determination Software for GPS/GNSS, the 49th Space Sciences and Technology Conference, Hiroshima, Japan, 2005.
Umino, N., T. Okada, A. Nakamura, J. Nakajima, T. Sato, S. Hori, T. Kono, K. Nida, S. Ueki, T. Matsuzawa, A. Hasegawa, and H. Hamaguchi, Aftershock distribution for the M6.1 earthquake of 3 September 1998 in Shizukuishi, Iwate prefecture, northeastern Japan, Active Fault Res., 17, 1–8, 1998 (in Japanese with an English abstract).
Wessel, P. and W. H. F. Smith, Free software helps map and display data, EOS Trans. AGU, 72, 445–446, 1991.
Zhang, H. J. and C. H. Thurber, Double-difference tomography: the method and its application to the Hayward fault, California, Bull. Seism. Soc. Am., 93, 1875–1889, 2003.
Zumberge, J. F., M. B. Heflin, D. C. Jefferson, M. M. Watkins, and F. H. Webb, Precise point positioning for the efficient and robust analysis of GPS data from large networks, J. Geophys. Res., 102(B3), 5005–5017 MAR 10, 1997.
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Ohta, Y., Ohzono, M., Miura, S. et al. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced by a dense GPS network. Earth Planet Sp 60, 1197–1201 (2008). https://doi.org/10.1186/BF03352878
- 2008 Iwate-Miyagi Nairiku earthquake
- kinematic GPS
- coseismic fault model