Source model of Noto-Hanto-Oki earthquake tsunami of 7 February 1993 |
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| Authors: | Kuniaki Abe Masami Okada |
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| Institution: | (1) Niigata Junior College, Nippon Dental Univ., Hamauracho 1-8, 951 Niigata, Japan;(2) Meteorological Research Institute, Nagamine 1-1, 305 Tsukuba, Japan |
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| Abstract: | A source model was discussed for a small tsunami accompanied by the Noto-Hanto-Oki earthquake (M
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6.6), striking Japan on 7 February, 1994. Assuming a fault model under the sea bottom, we estimated the focal parameters jointly, using synthesized tsunami source spectra as well as the tsunami numerical simulation. The fault proposed by this study consists of a plane sized 15×15 km, dipping N47°W with the dip angle of 42°, which is almost pure reverse fault (slip angle 87°) with a dislocation of 1 meter. The numerical simulation shows that the shallow sea in the source region caused a comparatively long recurring tsunami (the periods are 12–18 minutes) in spite of its small size. The model fault is corresponding to an aftershock area of this earthquake. |
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| Keywords: | Noto-Hanto-Oki earthquake tsunami source model spectral synthesis numerical simulation |
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