1983年日本海中部地震による津波発生の特徴-とくに地震のメカニズムとの関係

抄録

Author's paper (1985) shows that there is a close relationship between tsunami occurrence and tectonics off the coast of Japan. This paper studies the same problem, especially the relationship between tsunami occurrence and earthquake mechanism, on the 1983 Nihonkai-Chubu earthquake. The 1983 tsunami has many and very accurate records adding to the Korean and U. S. S. R. stations. The obtained results are followings.
1) The northern and southern boundaries of the tsunami source are parallel to the isodepth lines of the ocean bottom.
2) The apparently elongated direction of the tsunami source is the N-S direction parallel to the strike of the earthquake fault.
3) The initial amplitude of the tsunami is large at the north and south directions of the earthquake fault. The fault model derived from the aftershock area and so on shows reverse faulting on an eastward dipping plane, however, judging from the distribution of the initial amplitude of the tsunamis and so on, a possibility of the faulting on a westward dipping plane has not to be neglected.