- Open Access
Seafloor displacement at Kumano-nada caused by the 2004 off Kii Peninsula earthquakes, detected through repeated GPS/Acoustic surveys
Earth, Planets and Space volume 58, pages 911–915 (2006)
In 2004, we started monitoring crustal deformation at Kumano-nada in the Nankai trough using the GPS/Acoustic technique. We observed a large southward seafloor displacement of ∼30 cm associated with the off Kii Peninsula earthquake, which occurred in September 2004, between our two survey campaigns in August and November 2004. The observed seafloor displacement is larger than that predicted from a slip model derived solely from GPS measurements on land. This may indicate the earthquake fault is slightly shallower and extends move to the NW than previously estimated.
Ando, M., Source mechanisms and tectonic significance of historical earthquakes along the Nankai Trough, Japan, Tectonophys., 27, 119–140, 1975.
Asada, A. and T. Yabuki, Centimeter-level positioning on the seafloor, Proc. Japan Acad., 77(B), 7–12, 2001.
Feigl, K. L. and E. Dupre, RNGCHN: a program to calculate displacement components from dislocations in an elastic half-space with applications for modeling geodetic measurements of crustal deformation, Computers & Geosciences, 25, 695–704, 1999.
Fujita, M., T. Ishikawa, M. Mochizuki, M. Sato, S. Toyama, M. Katayama, K. Kawai, Y. Matsumoto, T. Yabuki, A. Asada, and O. L. Colombo, GPS/Acoustic seafloor geodetic observation: method of data analysis and its application, Earth Planets Space, 58, 265–275, 2006.
Funakoshi, M., Y. Osada, S. Miura, M. Nishino, A. Kuwano, R. Hino, and H. Fujimoto, Initial results of GPS/Acoustic seafloor positioning using a small towed buoy off Miyagi Prefecture, northern Japan, J. Geod. Soc. Japan, 2005 (in Japanese) (submitted).
Gagnon, K., C. D. Chadwell, and E. Norabuena, Measuring the onset of locking in the Peru-Chile trench with GPS and acoustic measurements, Nature, 434, 205–208, 2005.
Geographical Survey Institute (GSI), The earthquake SE off Kii peninsula on September 5, in the summary of the 159 meeting of the Coord. Com. Earthq. Pred., http://cais.gsi.go.jp/YOCHIREN/JIS/159/index159.html, 2004.
Hara, T., Change of the source mechanism of the main shock of the 2004 off the Kii peninsula earthquakes inferred from long period body wave data, Earth Planets Space, 57, 179–183, 2005.
Hashimoto, M., K. Onoue, F. Ohya, Y. Hoso, K. Segawa, K. Sato, and Y. Fujita, Crustal deformations in Kii peninsula associated with the SE off the Kii peninsula earthquake sequence of September 5, 2004 derived from dense GPS observations, Earth Planets Space, 57, 185–190, 2005.
Ito, Y., T. Matsumoto, H. Kimura, H. Matsubayashi, K. Obara, and S. Sekiguchi, Spatial distribution of centroid moment tensor solutions for the 2004 off Kii peninsula earthquakes, Earth Planets Space, 57, 351–356, 2005.
Kido, M., H. Fujimoto, K. Tsuka, and T. Tabei, Earthquake-induced seafloor displacement at Kumano-nada in Nankai trough, detected by repeated GPS/Acoustic surveys, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract G51B-0827, 2005.
Kusunose, T., Y. Tanioka, K. Satake, T. Baba, K. Hirata, S. Iwasaki, T. Kato, S. Koshimura, Y. Hasegawa, and T. Imakiire, Slip distributions of the 2004 off Kii-peninsula earthquakes (Mw 7.3, 7.5) estimated by joint inversion using tsunami waveforms and crustal deformation data, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract S12A–03, 2005.
Nakamura, Y., J. Ashi, S. Morita, and K. Mochizuki, Detailed seismic image of mud volcones in Kumano basin, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract T13B-0457, 2005.
Okada, Y., Internal deformation due to shear and tensile faults in a halfspace, Bull. Seismol. Soc. Amer., 82, 1018–1040, 1992.
Sagiya, T., A decade of GEONET: 1994—2003—The continuous GPS observation in Japan and its impact on earthquake studies, Earth Planets Space, 56, xxix–xli, 2004.
Sakai, S., T. Yamada, M. Shinohara, H. Hagiwara, T. Kanazawa, K. Obana, S. Kodaira, and Y. Kaneda, Urgent aftershock observation of the 2004 off the Kii Peninsula earthquake using ocean bottom seismometers, Earth Planets Space, 57, 363–368, 2005.
Seno, T., S. Stein, and A. E. Grippe, A model for the motion of the Philippine Sea plate consistent with NUVEL-1 and geological data, J. Geophys. Res., 98, 17941–17948, 1993.
Spiess, F. N., Analysis of a possible seafloor strain measurement system, Marine Geodesy, 9, 385–398, 1985.
Spiess, F. N., C. D. Chadwell, J. A. Hildebrand, L. E. Young, G. H. Purcell, Jr., and H. Dragert, Precise GPS/Acoustic positioning of seafloor reference points for tectonic studies, Phys. Earth Planet. Inter., 108, 101–112, 1998.
Stephen, M. L., Y. Sever, W. L. Bertiger, M. Heflin, K. Hurst, R. J. Muellerschoen, S. C. Wu, T. Yunk, and J. Zumberge, GIPSY-OASIS II: A High Precision GPS Data Processing System and General Satellite Orbit Analysis Tool, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 1996.
Tadokoro, K., R. Ikuta, M. Ando, T. Okuda, S. Sugimoto, G. M. Besana, and M. Kuno, First observation of coseismic seafloor crustal deformation due to M7 class earthquakes in the Philippine Sea plate, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract G41A-0348, 2005.
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, 5005–5017, 1997.
About this article
Cite this article
Kido, M., Fujimoto, H., Miura, S. et al. Seafloor displacement at Kumano-nada caused by the 2004 off Kii Peninsula earthquakes, detected through repeated GPS/Acoustic surveys. Earth Planet Sp 58, 911–915 (2006). https://doi.org/10.1186/BF03351996
- GPS/Acoustic measurement
- seafloor displacement
- 2004 off Kii Peninsula earthquake