- Open Access
Small repeating earthquakes and interplate creep around the 2005 Miyagi-oki earthquake (M=7.2)
Earth, Planets and Space volume 58, pages1577–1580(2006)
Taking advantage of the feature that creep around an asperity is necessary for the recurrent rupture of the same small asperity (small repeating earthquakes), we have estimated the spatio-temporal distribution of quasistatic slip (creep) around the 2005 Miyagi-oki earthquake (M=7.2) using the distribution of small repeating earthquakes. The creep was detected mainly outside of the coseismic slip areas for the 2005 Miyagi-oki, 1978 Miyagi-oki (M=7.6) and 2003 Fukushima-oki (M=6.8) earthquakes. The creep rates estimated from the recurrence intervals and slip amounts of small repeating earthquakes for 21 years were almost constant for the areas near the western limit of the interplate earthquakes but they varied temporally in the areas nearer to the Japan trench. The changes in the creep rates before and after the 2005 Miyagi-oki earthquake were not significant with the exception of small slip accelerations in some areas near the Japan trench. These results suggest that the plate boundary around the source area for the 2005 earthquake is still mostly locked.
Ellsworth, W. L., Characteristic earthquake and long-term earthquake forecasts: Implications of central California seismicity, in Urban Disaster Mitigation: The Role of Science and Technology, edited by F. Y. Cheng and M. S. Sheu, Elsevier, Oxford, 1995.
Hanks, T. C. and H. Kanamori, A moment magnitude scale, J. Geophys. Res., 84, 2348–2350, 1979.
Heki, K., S. Miyazaki, and H. Tsuji, Silent fault slip following and interplate thrust earthquake at the Japan trench, Nature, 386, 595–598, 1997.
Igarashi, T., T. Matsuzawa, N. Umino, and A. Hasegawa, Spacial distribution of focal mechanisms for interplate and intraplate earthquake associated with the subducting Pacific plate beneath the northeastern Japan arc: A triple-planed deep seismic zone, J. Geophys. Res., 106, 2177–2191, 2001.
Igarashi, T., T. Matsuzawa, and A. Hasegawa, Repeating earthquakes and interplate aseismic slip in the northeastern Japan subduction zone, J. Geophys. Res., 108, 10.1029/2002JB001920, 2003.
Kawasaki, I., Y. Asai, and Y. Tamura, Space-time distribution of interplate moment release including slow earthquakes and the seismo-geodetic coupling in the Sanriku-oki region along the Japan trench, Tectonophys., 330, 267–283, 2001.
Matsubara, M., Y. Yagi, and K. Obara, Plate boundary slip associated with the 2003 Off-Tokachi earthquake based on small repeating earthquake data, Geophys. Res. Lett., 32, L08316, doi:10.1029/2004GL022310, 2005.
Miura, S., I. 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, this issue, 1567–1572, 2006.
Nadeau, R. M. and L. R. Johnson, Seismological studies at Parkfield VI: Moment release rates and estimates of source parameters for small repeating earthquakes, Bull. Seismol. Soc. Am., 88, 790–814, 1998.
Nadeau, R. M. and T. V. McEvilly, Fault slip rates at depth from recurrence intervals of repeating microearthquakes, Science, 285, 718–721, 1999.
Nishimura, T., S. Miura, K. Tachibana, K. Hashimoto, T. Sato, S. Hori, E. Murakami, T. Kono, K. Nida, K. Mishina, T. Hirasawa, and S. Miyazaki, Distribution of seismic coupling on the subducting plate boundary in northeastern Japan inferred from GPS observation, Tectonophys., 323, 217–238, 2000.
Ohtake, M. and H. Ueda, Statistical forecast of the next Miyagi-oki, northeast Honshu earthquake, Tohoku Geophys. J, 36, 299–310, 2002.
Okada, T., T. Yaginuma, N. Umino, T. Kono, T. Matsuzawa, S. Kita, and A. Hasegawa, The 2005 M7.2 Miyagi-oki earthquake, NE Japan: possible re-rupturing of one of asperities that caused the previous M7.4 earthquake, Geophys. Res. Lett., 32, doi:10.1029/2005GL024613, 2005.
Suwa, Y., S. Miura, A. Hasegawa, T. Sato, and K. Tachibana, Interplate coupling beneath NE Japan inferred from three dimensional displacement fields, J. Geophys. Res., 111, B04402, doi:101029/2004JB003203, 2006.
The Headquarters for Earthquake Research Promotion, Earthquake Offshore of Miyagi Prefecture on August 16, 2005, 2005.
Uchida, N., T. Matsuzawa, A. Hasegawa, and T. Igarashi, Interplate quasistatic slip off Sanriku, NE Japan, estimated from repeating earthquakes, Geophys. Res. Lett., 30, doi:10.1029/2003GL017452, 2003.
Uchida, N., A. Hasegawa, T. Matsuzawa, and T. Igarashi, Pre- and postseismic slow slip on the plate boundary off Sanriku, NE Japan associated with three interplate earthquakes as estimated from small repeating earthquake data, Tectonophys., 385, 1–15, 2004.
Wessel, P. and W. H. F. Smith, New version of the Generic Mapping Tools released, Eos Trans. AGU, 76, 329, 1995.
Yaginuma, T., T. Okada, Y. Yagi, T. Matsuzawa, N. Umino, and A. Hasegawa, Co-seismic slip distribution of the 2005 off Miyagi earthquake (M7.2) estimated by inversion of teleseismic and regional seismograms, Earth Planets Space, 58, this issue, 1549–1554, 2006.
Yamanaka, Y., October, 31, off-Fukushima earthquake (Mj6.8), EIC Seismological note, No. 141, 2003.
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.
About this article
Cite this article
Uchida, N., Matsuzawa, T., Hirahara, S. et al. Small repeating earthquakes and interplate creep around the 2005 Miyagi-oki earthquake (M=7.2). Earth Planet Sp 58, 1577–1580 (2006). https://doi.org/10.1186/BF03352664
- Repeating earthquake
- slow slip
- subduction zone
- interplate earthquake