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タイトル: Observations of Seiche-Related Tilt in the Aburatsubo Observatory
その他のタイトル: 油壺観測所におけるセイシュに関連した傾斜の観測
著者: Yanagisawa, Michio
著者(別言語): 柳沢, 道夫
発行日: 1980年11月15日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第55冊第2号, 1980.11.15, pp. 331-345
抄録: It is known that the seiche in Aburatsubo Bay has the periods 13 to 16 min. In order to confirm the seiche theoretically, the author applies a Y-shaped topographical model to Aburatsubo and Moroiso Bays. As a result, it is shown that the free oscillation of sea-surface has the periods of 13.5, 7.6 and 5.1 min, which correspond to the fundamental, the second and the third harmonic waves, respectively. However, the second and higher waves cannot be detected by observation, probably because the node of the second harmonic is located near the tiltmeter station. The sea-surface behavior of Koajiro Bay seems ineffective on the seiche in Aburatsubo Bay. The effect of the seiche on ground tilt has been observed by four sets of TEM tiltmeters and a pressure-type tide-gauge during the period February to May, 1979. The ratio of tilt and seiche amplitude is empirically determined as a function of the distance from the coast line on the basis of the results of observations. The ratio is greater than what we expected from the theory by the factor of 1.2~1.3, but the direction of maximum tilt is in agreement at each observation site.
URI: http://hdl.handle.net/2261/12759
ISSN: 00408972


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