Abstract
Heterogeneous fault motion of the 1993 Hokkaido Nansei-Oki earthquake is studied by using seismic, geodetic and tsunami data, and the tsunami generation from the fault model is examined. Seismological analyses indicate that the focal mechanism of the first 10 s, when about a third of the total moment was released, is different from the overall focal mechanism. A joint inversion of geodetic data on Okushiri Island and the tide gauge records in Japan and Korea indicates that the largest slip, about 6 m, occurred in a small area just south of the epicenter. This corresponds to the initial rupture on a fault plane dipping shallowly to the west. The slip on the northernmost subfault, which is dipping to the east, is about 2 m, while the slips on the southern subfaults, which are steeply dipping to the west, are more than 3 m. Tsunami heights around Okushiri Island are calculated from the heterogeneous fault model using different grid sizes. Computation on the smaller grids produces large tsunami height that are closer to the observed tsunami runup heights. Tsunami propagation in the nearly closed Japan Sea is examined as the free oscillation of the Japan Sea. The excitation of the free oscillation by this earthquake is smaller than that by the 1964 Niigata or 1983 Japan Sea earthquake.
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References
Dziewonski, A. M., Ekström, G., andSalganik, M. P. (1994),Centroid-moment Tensor Solutions for July–September 1993, Phys. Earth Planet. Inter.83, 165–174.
Fukao, Y., andFurumoto, M. (1975),Mechanism of Large Earthquakes along the Eastern Margin of the Japan Sea, Tectonophys.26, 247–266.
Hokkaido Tsunami Survey Group (1993),Tsunami Devastates Japanese Coastal Region, EOS, Trans. Am. Geophys. Union74, 417, 432.
Ishiyama, Y.,The 1993 Hokkaido Nansei-oki earthquake, tsunami, and their damage. InReport for Grant-in-aid (05306012) (ed. Ishiyama, Y.) (Ministry of Education, Science and Culture 1994) 196 pp. 1–11 (in Japanese).
Kasahara, M., Kodaira, S., Motoya, Y., Takanami, T., Maeda, I., Okayama, M., Ishikawa, H., Ichiyanagi, M., Yamamoto, A., Matsumoto, S. D., Tsumura, N., Okada, T., Yabe, Y., Iidaka, T., andHirata, N.,Aftershock activity and distribution of the 1993 Hokkaido Nansei-oki earthquake. InReport for Grant-in-aid (05306012) (ed. Ishiyama, Y.) (Ministry of Education, Science and Culture 1994) 196 pp. 13–19 (in Japanese).
Kobayashi, Y. (1983),On the Initiation of Subduction of Plates, Earth Monthly5, 510–514 (in Japanese).
Kumaki, T., Kisanuki, J., Ohtani, T., Ono, Y., andKajikawa, S. (1993),Vertical Seismic Crustal Movement of the 1993 Hokkaido-Nansei-oki Earthquake Based on Coastal Landform Changes in the Okushiri Island, West of Hokkaido, Japan, Prog. Abst. Seism. Soc. Japan2, 63.
Nakamura, K. (1983),Possible Nascent Trench Along the Eastern Japan Sea as the Convergent Boundary between Eurasian and North American Plates, Bull. Earthq. Res. Inst. Univ. of Tokyo58, 711–722 (in Japanese).
Okada, Y. (1985),Surface Deformation due to Shear and Tensile Faults in a Half-space, Bull. Seismol. Soc. Am.75, 1135–1154.
Satake, K. (1986),Re-examination of the 1940 Shakotan-oki Earthquake and the Fault Parameters of the Earthquakes along the Eastern Margin of the Japan Sea, Phys. Earth Planet. Inter.43, 137–147.
Satake, K. (1989),Inversion of Tsunami Waveforms for the Estimation of Heterogeneous Fault Motion of Large Submarine Earthquakes: 1968 Tokachi-oki and 1983 Japan Sea Earthquakes, J. Geophys. Res.94, 5627–5636.
Satake, K. (1993),The Depth Distribution of Coseismic Slip along the Nankai Trough, Japan, from Joint Inversion of Geodetic and Tsunami Data, J. Geophys. Res.98, 4553–4565.
Satake, K. (1995),Linear and Nonlinear Computations of the 1992 Nicaragua Earthquake Tsunamis, Pure and Appl. Geophys.144, 455–470.
Satake, K., andAbe, K. (1983),A Fault Model for the Niigata, Japan, Earthquake of June 16, 1964. J. Phys. Earth.31, 217–223.
Satake, K., andShimazaki, K. (1987),Computation of Tsunami Waveforms by a Superposition of Normal Modes, J. Phys. Earth.35, 409–414.
Satake, K., andShimazaki, K. (1988a),Free Oscillation of the Japan Sea Excited by Earthquakes. I. Observation and Wave-theoretical Approach, Geophys. J.93, 451–456.
Satake, K., andShimazaki, K. (1988b),Free Oscillation of the Japan Sea Excited by Earthquakes. II. Modal Approach and Synthetic Tsunamis, Geophys. J.93, 457–463.
Seno, T., andSakurai, T. (1993),Can the Okhotsk Plate be Discriminated from the North American Plate? EOS, Trans. Am. Geophys. Union74, Fall Meeting Supplement, 585.
Shuto, N., andMatsutomi, H. (1995),Field Survey of the 1993 Hokkaido Nansei-oki Earthquake Tsunami, Pure and Appl. Geophys.144, 649–663.
Sipkin, S. A. (1994),Rapid Determination of Global Moment-tensor Solutions, Geophys. Res. Lett.21, 1667–1670.
Tanioka, Y., Ruff, L. J., andSatake, K. (1993),Unusual Rupture Process of the Japan Sea Earthquake, EOS, Trans. Am. Geophys. Union74, 377, 379–380.
Tanioka, Y., Satake, K., andRuff, L. J. (1995),Total Analysis of the Hokkaido Nansei-oki Earthquake Using Seismological, Tsunami and Geodetic Data, Geophys. Res. Lett.22, 9–12.
Tichelaar, B. W., andRuff, L. J. (1989),How Good are our Best Models? Jackknifing, Bootstrapping and Earthquake Depth, EOS, Trans. Am. Geophys. Union70, 593, 605–606.
Tsutsumi, A., Shimamoto, T., Miyawaki, M., Sato, H., Kawamoto, E., andTanaka, J. (1993),Subsidence of the Okushiri Island Caused by the Southwest-off Hokkaido Earthquake, Prog. Abst. Seismol. Soc. Japan2, 62.
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Satake, K., Tanioka, Y. Tsunami generation of the 1993 Hokkaido Nansei-Oki earthquake. PAGEOPH 144, 803–821 (1995). https://doi.org/10.1007/BF00874395
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DOI: https://doi.org/10.1007/BF00874395