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Weak interplate coupling beneath the subduction zone off Fukushima, NE Japan, inferred from GPS/acoustic seafloor geodetic observation
Earth, Planets and Space volume 60, pages e9–e12 (2008)
Abstract
We have been carrying out GPS/acoustic seafloor geodetic observations at several reference points situated along the Japan Trench, a major plate boundary of subduction. A time series of horizontal coordinates of one of the seafloor reference points, located off Fukushima, obtained from seven campaign observations for the period 2002-2008, exhibits a linear trend with a scattering root mean square of about 3 cm. A linear fit to the time series gives an intraplate crustal movement velocity of 3.1 cm per year in a westerly direction, which is significantly smaller than that at the other seafloor reference point 120 km away along the trench axis. This result implies weak interplate coupling in this region.
References
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(B10), 2214, doi:10.1029/2001JB000561, 2002.
Asada, A. and T. Yabuki, Centimeter-level positioning on the seafloor, Proc. Jpn. Acad. Ser. B, 77, 7–12, 2001.
Colombo, O. L. and A. G. Evans, Precise, decimeter-level differential GPS over great distances at sea and on land, Proc. ION GPS-98, Nashville, Tennessee, 1998.
Colombo, O. L., A. G. Evans, M. I. Vigo-Aguiar, J. M. Ferrandiz, and J. J. Benjamin, Long-baseline (>1000 km), sub-decimeter kinematic positioning of buoys at sea, with potential application to deep sea studies, Proc. ION GPS2000, Salt Lake City, Utah, U.S.A., 2000.
Colombo, O. L., A. G. Evans, M. Ando, K. Tadokoro, K. Sato, and T. Yamada, Speeding up the estimation of floated ambiguities for sub-decimeter kinematic positioning at sea, Proc. ION GPS-2001, Salt Lake City, Utah, U.S.A., 2001.
DeMets, C., R. G. Gordon, D. 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.
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, 2006a.
Fujita, M., Y. Matsumoto, T. Ishikawa, M. Mochizuki, M. Sato, S. Toyama, K. Kawai, T. Yabuki, A. Asada, and O. L. Colombo, Combined GPS/Acoustic seafloor geodetic observation system for monitoring offshore active seismic regions near Japan, Proc. ION GNSS-2006, Fort Worth, Texas, U.S.A., 2006b.
Ishikawa, T. and M. Fujita, Inverse method and precision improvement for seafloor positioning, Rep. Hydrogr. Oceanogr. Res., 41, 27–34, 2005 (in Japanese with English abstract).
Japan Coast Guard, GPS observation for monitoring crustal movements in Zeni Su in 2004, DATA Report of Hydrogr. Oceanogr. Observ. Ser. Satellite Geod., 18, http://www1.kaiho.mlit.go.jp/jhd-E.html, Tokyo, Japan, 2005 (in Japanese).
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.
Mizukami, T., H. Fujimoto, Y. Osada, M. Kido, and S. Miura, Repeated seafloor geodetic measurements off Fukushima Prefecture using the GPS/Acoustic positioning system, Abstr. JPGU Meet. 2007, J169–015, 2007.
Mochizuki, M., M. Sato, M. Katayama, T. Yabuki, Z. Yoshida, and A. Asada, Construction of seafloor geodetic observation network around Japan, Recent advances in marine science and technology, 2002, 591–600, 2003.
Mochizuki, M., M. Fujita, M. Sato, Z. Yoshida, M. Katayama, T. Yabuki, and A. Asada, Repeated trials of seafloor geodetic observation around Japan, Recent advances in marine science and technology, 2004, 11–18, 2005.
Sengoku, A., A plate motion study using Ajisai SLR data, Earth Planets Space, 50, 611–627, 1998.
Spiess, F. N., Suboceanic geodetic measurements, IEEE Trans. Geosci. Remote Sens., GE-23, 4, 502–510, 1985.
Suwa, Y., S. Miura, A. Hasegawa, T. Sato, and K. Tachibana, Interplate coupling beneath NE Japan inferred from three dimensional displacement field, J. Geophys. Res., 111, doi:101029/2004JB003203, 2006.
The Headquarters for Earthquake Research Promotion, Long-term evaluatioin of the Off-Miyagi earthquakes, http://www.jishin.go.jp/main/index.html, Tokyo, Japan, 2000 (in Japanese).
The Headquarters for Earthquake Research Promotion, Long-term evaluation of seismic activities off-Sanriku to off-Bousou, http://www.jishin.go.jp/main/index.html, Tokyo, Japan, 2002 (in Japanese).
Uchida, N., T. Matsuzawa, S. Hirahara, and A. Hasegawa, Small repeating earthquakes and interplate creep around the 2005 Miyagi-oki earthquake (M=7.2), Earth Planets Space, 58, 1577–1580, 2006.
Wessel, P. and W. H. F. Smith, Free software helps map and display data, EOS Trans. AGU, 72, 441, 445–446, 1991.
Yamanaka, Y. and M. Kikuchi, Asperity map along the subduction zone in northeastern Japan inferred from regional seismic data, J. Geophys. Res., 109, B07307, doi:10.1029/2003JB002683, 2004.
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Matsumoto, Y., Ishikawa, T., Fujita, M. et al. Weak interplate coupling beneath the subduction zone off Fukushima, NE Japan, inferred from GPS/acoustic seafloor geodetic observation. Earth Planet Sp 60, e9–e12 (2008). https://doi.org/10.1186/BF03353114
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DOI: https://doi.org/10.1186/BF03353114