Special Issue: Special section for the 2003 Tokachi-oki earthquake
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GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (M JMA 8.0), off southeastern Hokkaido, Japan
Earth, Planets and Space volume 56, pages 377–382 (2004)
To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake (M JMA = 8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4–11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake.
Altamimi, Z., P. Sillard, and C. Boucher, ITRF2000: A new release of the International Terrestrial Reference Frame for earth science applications, J. Geophys. Res., 107, 2214, doi:10.1029/2001JB000561, 2002.
Aoki, Y. and C. H. Scholz, Vertical deformation of the Japanese islands, 1996–1999, J. Geophys. Res., 108, 2257, doi:10.1029/2002JB002129, 2003.
DeMets, C., R. Gordon, F. Argus, and S. Stein, Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions, Geophys. Res. Lett., 21, 2191–2194, 1994.
Ergintav, S., R. Burgmann, S. McClusky, R. Cakmak, R. E. Reilinger, O. Lenk, A. Barka, and H. Ozener, Postseismic deformation near the Izmit earthquake (17 August 1999, M7.5) rupture zone, Bull. Seism. Soc. Am., 92, 194–207, 2002.
Geographical Survey Institute of Japan, Vertical crustal movements in Japan estimated from the leveling observations data for the past 100 years, Report of the coordinating committee for earthquake prediction, 67, 555, 2002.
Heki, K., Space geodetic observation of deep basal subduction erosion in northeastern Japan, Earth Sci. Planet. Lett., 219, 13–20, 2004.
Heki, K., S. Miyazaki, and H. Tsuji, Silent fault slip following an interplate thrust earthquake at the Japan Trench, Nature, 386, 595–598, 1997.
Hirakawa, K., Y. Nakamura, and T. Echigo, Large paleo-tsunamis along the Pacific coast of Tokachi region, Hokkaido, Chikyu Monthly, Special Issue, 31, 92–98, 2000 (in Japanese).
Hugentobler, U., S. Schaer, and P. Fridez, Bernese GPS Software Version 4.2, University of Bern, 515 pp, 2001.
Kasahara, M., A fault model of the 1952 Tokachi-oki earthquake, Program and Abstract of the Seismilogical Society of Japan, 2, 90, 1975 (in Japanese).
Kasahara, K. and T. Kato, Aseismic faulting folloing the 1973 Nemuro-oki Earthquake, Hokkaido, Japan (a retrospective study), PAGEOPH, 119, 392–403, 1981.
Katsumata, K., M. Kasahara, S. Ozawa, and A. Ivashchenko, A five years super-slow precursor model for the 1994 M8.3 Hokkaido-Toho-Oki lithospheric earthquake based on tide gauge data, Geophys. Res. Lett., 29, 1654, doi:10.1029/2002GL014982, 2002.
Marone, C. J., C. H. Scholz, and R. Bilham, On the mechanics of earthquake afterslip, J. Geophys. Res., 96, 8441–8452, 1991.
Melbourne, T. I., F. H. Webb, J. M. Stock, and C. Reigber, Rapid postseismic transient in subduction zones from continuous GPS data, J. Geophys. Res., 107, doi:10.1029/2001JB000555, 2002.
Miyazaki, S., T. Iwabuchi, K. Heki, and I. Naito, An impact of estimating tropospheric gradient on precise positioning in summer using the Japanese nationwide GPS array, J. Geophys. Res., 108, 2335, doi:10.1029/2000JB00113, 2003.
Nakano, T. and K. Hirahara, GPS observation of posetseismic deformation for the 1995 Hyogo-ken Nanbu earthquake, Japan, Geophys. Res. Lett., 24, 503–506, 1997.
Nanayama, F., K. Satake, R. Furukawa, K. Shimokawa, B. F. Atwater, K. Shigeno, and S. Yamaki, Unusually large earthquakes inferred from tsunami deposits along the Kuril trench, Nature, 424, 660–663, 2003.
Okada, Y., Surface deformation due to shear and tensile faults in a half space, Bull. Seis. Soc. Am., 75, 1135–1154, 1985.
Sawai, Y., Episodic emergence in the past 3000 years at the Akkeshi estuary, Hokkaido, northern Japan, Quaternary Reseach, 56, 231–241, 2001.
Sawai, Y., Evidence for 17th-century tsunamis generated on the Kuril-Kamchatka subduction zone, Lake Tokotan, Hokkaido, Japan, J. Asian Earth Sci., 20, 903–911, 2002.
Sawai, Y., H. Nasu, and Y. Yasuda, Fluctuations in relative sea-level during the past 3000 yr in the Onnetoh estuary, Hokkaido, northern Japan, J. Quater. Sci., 17, 607–622, 2002.
Scholz, C. H., The Mechanics of Earthquakes and Faulting, Cambridge University Press, 1990.
Shimazaki, K., Nemuro-oki Eathquake of June 17, 1973: A lithospheric rebound at the upper half of the interface, Phys. Earth Planet. Int., 9, 314–327, 1974.
Takahashi, H., M. Okayama, M. Ichiyanagi, M. Takada, T. Yamaguchi, K. Hirata, T. Watanabe, H. Mikada, and M. Kasahara, Aftershock distribution of the 2003 Tokachi-oki earthquake (MJMA = 8.0) by land and submarine regional seismic network data, 2004 (submitted).
Yamanaka, Y. and M. Kikuchi, Source processes of the recurrent Tokachioki earthquake on September 26, 2003, inferred from teleseismic body waves, Earth Planets Space, 55, e21–e24, 2003.
Wessel, P. and W. H. F. Smith, New Version of the Generic Mapping Tools Released, EOS Trans. AGU, 76, 329, 1995.
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Takahashi, H., Nakao, S., Okazaki, N. et al. GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (M JMA 8.0), off southeastern Hokkaido, Japan. Earth Planet Sp 56, 377–382 (2004). https://doi.org/10.1186/BF03353068
- The 2003 Tokachi-oki earthquake
- postseismic deformation