CHARACTERISTICS OF MICROSEISMS MEASURED NEAR THE NIIGATA WEST COAST IN RELATION TO WAVE FREQUENCY SPECTRUM
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- IZUMIYA Takashi
- 新潟大学 工学部建設学科
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- KIKUCHI Yuta
- 新潟県 新潟地域振興局津川地区振興事務所
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- ISHIBASHI Kunihiko
- 新潟大学 工学部建設学科
Bibliographic Information
- Other Title
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- 海岸護岸周辺の常時微動特性と波浪諸元との関連性に関する研究
- カイガン ゴガン シュウヘン ノ ジョウジ ビドウ トクセイ ト ハロウ ショゲン ト ノ カンレンセイ ニ カンスル ケンキュウ
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Abstract
Microseisms were measured on the Niigata West Coast by using broadband seismometer in order to reveal the features and the origin of them. The observed microseism contained a predominant fluctuating component with the period of 3s to 4s, which is about a half of the significant wave period. There exists a predominant direction of the propergation of microseism that is pointing northward, the northeastern part of the sea of Japan where larger waves are generating. Using the theory of the generation of microseisms by Longuet-Higgins(1950) and Hasselmann(1963), the bottom pressure spectrum was calculated and compared with the spectrum of microseisms. It was found that the peak frequency and shape of the pressure spectrum agree well with those of the spectrum of microseisms. It means that observed microseisms were generated by the bottom pressure fluctuations with a frequency of 2fp.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72 (2), I_121-I_126, 2016
Japan Society of Civil Engineers