Special Issue: Special Section for the 2004 off the Kii peninsula earthquakes (2)
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Spatial distribution of centroid moment tensor solutions for the 2004 off Kii peninsula earthquakes
Earth, Planets and Space volume 57, pages 351–356 (2005)
Two large intraplate earthquakes (MW 7.0 and 7.3) occurred off the southeastern Kii Peninsula on September 5, 2004. We determined the centroid moment tensors of these earthquakes and their aftershocks. Earthquakes can be divided into two categories: (1) the reverse-fault type with a range in focal depth from 5 km to 20 km; and (2) earthquakes with a near-vertical nodal plane and a focal depth shallower than 5 km. Earthquakes of type (1) are distributed inside the Philippine Sea plate beneath the Nankai trough, while normal-fault events predominate in the other regions along the trough. The distribution of type (2) events shows two clear lineaments with strikes of NNW-SSE to the north and NE-SW to the west of the focal area. These lineament strikes coincide approximately with strikes at the nodal planes of such events.
Fukuyama, E., M. Ishida, D. S. Dreger, and H. Kawai, Automated seismic moment tensor determination by using on-line broadband seismic waveforms, J. Seismol. Soc. Japan (Zisin), 51, 149–156, 1998 (in Japanese with English abstract).
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.
Japan Meteorological Agency, The Seismological and Volcanological Bulletin of Japan, Japan Meteorological Agency, Tokyo, 2004.
Kagan, Y. Y., 3-D rotation of double-couple earthquake sources, Geophys. J. Int., 106, 709–716, 1991.
Kikuchi, M., M. Nakamura, and K. Yoshikawa, Source rupture processes of the 1944 Tonankai earthquake and the 1945 Mikawa earthquake derived from low-gain seismograms, Earth Planets Space, 55, 159–172, 2003.
Lay, T., L. Astiz, H. Kanamori, and D. H. Christensen, Temporal variation of large intraplate earthquakes in coupled subduction zones, Phys. Earth Planet. Inter., 54, 258–312, 1989.
Nakanishi, A., H. Shiobara, R. Hino, J. Kasahara, K. Suyehiro, and H. Shinohara, Crustal structure around the eastern end of coseismic rupture zone of the 1944 Tonankai earthquake, Tectonophysics, 354, 257–275, 2002.
Obara, K. and Y. Ito, Very low frequency earthquakes excited by the 2004 off the Kii peninsula earthquakes: A dynamic deformation process in the large accretionary prism, Earth Planets Space, this issue, 57, 321–326, 2005.
Okada, Y., K. Kasahara, S. Hori, K. Obara, S. Sekiguchi, H. Fujiwara, and A. Yamamoto, Recent progress of seismic observation networks in Japan—Hi-net, F-net, K-NET, and KiK-net, Earth Planets Space, 56, xv–xxviii, 2004.
Satake, K., T. Baba, K. Hirata, S. Iwasaki, T. Kato, S. Koshimura, J. Takenaka, and Y. Terada, Tsunami source of the 2004 off the Kii Peninsula earthquakes inferred from offshore tsunami and coastal tide gauges, Earth Planets Space, 57, 173–178, 2005.
Seno, T., S. Stein, and A. E. Grippe, A model for the motion of the Philippine Sea plate consistent with NYVEL-1 and geological data, J. Geophys. Res., 98, 17941–17948, 1993.
Shiomi, K., K. Obara, S. Aoi, and K. Kasahara, Estimation on the azimuth of the Hi-net and KiK-net borehole seismometers, J. Seismol. Soc. Jpn. (Zisin), 56, 99–110, 2003 (in Japanese).
Utsu, T., Seismology, second edition, 310 pp., Kyoritsu Syuppan, Tokyo, 1984 (in Japanese).
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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Ito, Y., Matsumoto, T., Kimura, H. et al. Spatial distribution of centroid moment tensor solutions for the 2004 off Kii peninsula earthquakes. Earth Planet Sp 57, 351–356 (2005). https://doi.org/10.1186/BF03352575
- Centroid moment tensor
- broadband seismometer