ログイン
言語:

WEKO3

  • トップ
  • ランキング
To
lat lon distance
To

Field does not validate



インデックスリンク

インデックスツリー

メールアドレスを入力してください。

WEKO

One fine body…

WEKO

One fine body…

アイテム

  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 40
  4. 3
  1. 0 資料タイプ別
  2. 30 紀要・部局刊行物
  3. 東京大学地震研究所彙報
  4. 40
  5. 3

伊豆大島で観測された長周期波の周期分析

https://doi.org/10.15083/0000033776
https://doi.org/10.15083/0000033776
2cdaaada-6769-42ff-8d95-0b0aedcd93d5
名前 / ファイル ライセンス アクション
ji0403010.pdf ji0403010.pdf (959.7 kB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-30
タイトル
タイトル 伊豆大島で観測された長周期波の周期分析
言語 ja
言語
言語 jpn
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.15083/0000033776
ID登録タイプ JaLC
その他のタイトル
その他のタイトル SpectralAnalyses of Long-period Ocean Waves observed at Izu-Oshima
著者 高橋, 龍太郎

× 高橋, 龍太郎

WEKO 131839

高橋, 龍太郎

Search repository
相田, 勇

× 相田, 勇

WEKO 131840

相田, 勇

Search repository
著者別名
識別子Scheme WEKO
識別子 131841
姓名 Takahasi, Ryutaro
著者別名
識別子Scheme WEKO
識別子 131842
姓名 Aida, Isamu
著者所属
著者所属 地震研究所
抄録
内容記述タイプ Abstract
内容記述 Observations of long-period ocean waves have been carried out at Miyagi-Enoshima on the north-eastern coast of Japan for a long time. For tsunami study, however, it is necessary to have observation points similar to Enoshima at several places in the Pacific coast of Japan, and as a realization of this plan, the Izu-Oshima Tsunami Observatory was established in September 1960. This observatory stands at Senzu, the north-eastern part of Oshima, a volcanic island situated on the Izu-Marianne ridge which separates the Philippine Sea from the Pacific Ocean. The observatory is therefore situated at a favorable position to record tsunamis originating both from the NE and SW parts of Honshu Island of Japan. The observatory includes an observation house made of concrete blocks and a gauge well built on lava of Mt. Mihara projecting into the sea. In the observatory are installed the ERI-IV tsunami recorder, a microbarograph and a microseismograph, as shown in Table 1. Tsunamis have not yet been observed, but spectra of records in different meteorological conditions were obtained to investigate the features of the background noise constantly observable in the records of the tsunami recorder. The spectral analyses were made by the wave analyser specially constructed for studies of the tsunami spectra. The following features were known by the present spectral analyses. 1. When typhoon 6124 approached Oshima island and sea and swell became heavy, the tsunami recorder recorded prominently 1 to 2 minute waves. As heights of this 1-2 minute waves have a good correlation with wind velocities, they may be the ""surf beat"" named by Munk. 2. The spectra of the records were obtained for the following four cases. (1) Oct. 8-9, 1961, when typhoon 6124 was approaching. (2) May 14-15, 1961, when a small depression was passing along the southern coast of Honshu Island. (3) Dec. 25-26, 1961, when a monsoon wind was blowing. (4) May 4-5, 1961, when a depression was passing through the Japan sea. In the first and second cases when wind waves were very rough off the coast of Senzu, the parts of the spectrum of the period shorter than 12 to 18 minutes are about twice as large as the parts of longer period. On the other hand, in the third and fourth cases when the sea off the coast of Senzu was rather calm, the spectra are flat extending over the whole period band. Therefore, it is supposed that the short period components of spectra relate to the activity of the sea just adjoining the coast. In the latter two cases, another remarkable fact is that the sea level fluctuations of the period longer than 60 minutes increased later to the greatest energy. 3. The predominant period of 11 to 12 minutes was recorded in each spectrum, which may be explained as being due to the island seich of this island. 4. In every case stated above, there is a striking fact that all spectra have a minimum at about 40 minutes in period. If we assume the mouth of Sagami Bay to be the line connecting Oshima and Boso peninsula, the natural period of the bay will be 38 minutes. The fact that a spectrum of the tide gauge record at Ito on the coast of Sagami Bay shows a peak of 42 minutes will be in favor of this assumption. If there is such a resonator it is only reasonable that the amplitude of the sea level fluctuations near Oshima is attenuated at the period of the free oscillation of Sagami Bay. The minimum point of the spectrum mentioned above may be the result of this effect. 5. A spectrum of the microbarograph record obtained at Oshima is hardly similar to that of the tsunami recorder, even when the microbarograph has recorded fair and regular waves. This fact shows that the long-period sea level fluctuations have little relation with the microbarometric disturbances at this island.
書誌情報 東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo

巻 40, 号 3, p. 561-573, 発行日 1962-11-30
ISSN
収録物識別子タイプ ISSN
収録物識別子 00408972
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00162258
フォーマット
内容記述タイプ Other
内容記述 application/pdf
日本十進分類法
主題Scheme NDC
主題 453
出版者
出版者 東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
戻る
0
views
See details
Views

Versions

Ver.1 2021-03-01 21:42:13.838109
Show All versions

Share

Mendeley Twitter Facebook Print Addthis

Cite as

エクスポート

OAI-PMH
  • OAI-PMH JPCOAR 2.0
  • OAI-PMH JPCOAR 1.0
  • OAI-PMH DublinCore
  • OAI-PMH DDI
Other Formats
  • JSON
  • BIBTEX

Confirm


Powered by WEKO3


Powered by WEKO3