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  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 46
  4. 4
  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. 46
  5. 4

38. Theoretical Seismograms of Spheroidal Type on the Surface of a Gravitating Elastic Sphere : 3. Case of a Homogeneous Mantle with a Liquid Core

https://doi.org/10.15083/0000033420
https://doi.org/10.15083/0000033420
6b594be8-5550-44f9-a8a3-04a0ef04a574
名前 / ファイル ライセンス アクション
ji0464001.pdf ji0464001.pdf (1.4 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-30
タイトル
タイトル 38. Theoretical Seismograms of Spheroidal Type on the Surface of a Gravitating Elastic Sphere : 3. Case of a Homogeneous Mantle with a Liquid Core
言語 en
言語
言語 eng
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 10.15083/0000033420
ID登録タイプ JaLC
その他のタイトル
その他のタイトル 38.重力均衡下にある弾性球の表面を伝わるスフェロイド型振動 : 3.流体核をもつ等方等質マントルの場合
言語 ja
著者 Usami, Tatsuo

× Usami, Tatsuo

WEKO 130495

Usami, Tatsuo

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Sato, Yasuo

× Sato, Yasuo

WEKO 130496

Sato, Yasuo

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Landisman, Mark

× Landisman, Mark

WEKO 130497

Landisman, Mark

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Odaka, Toshikazu

× Odaka, Toshikazu

WEKO 130498

Odaka, Toshikazu

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著者別名
識別子Scheme WEKO
識別子 130499
姓名 宇佐美, 龍夫
著者別名
識別子Scheme WEKO
識別子 130500
姓名 佐藤, 泰夫
著者別名
識別子Scheme WEKO
識別子 130501
姓名 小高, 俊一
著者所属
著者所属 Earthquake Research Institute
著者所属
著者所属 Geosciences Division, Southwest Center for Advanced Studies
著者所属
著者所属 Geophysical Institute, the University of Tokyo
抄録
内容記述タイプ Abstract
内容記述 Theoretical seismograms of spheroidal disturbances on the surface of an elastic sphere consisting of a homogeneous mantle and a liquid core are calculated when uniform radial stress is applied to a small circle around the pole. The effect of gravity is taken into consideration. Contributions are included from the free spheroidal oscillations of the first few radial modes for all orders with periods larger than 12 sec. The results of these computations are compared with the corresponding quantities for the case excluding the effect of gravity. Noteworthy results from the study of spheroidal disturbances propagating on the surface of a gravitating elastic sphere with a homogeneous mantle and a liquid core, when the uniform radial stress is applied to a circular area around the pole, are : 1. The difference between non-dimensional frequency for the present case and for the case excluding the effect of gravity is not a simple function. The discrepancy is large for modes lying along the branch specified by i=1'; it tends toward negligible values as the order number increases. 2. The corresponding phase and group velocities exhibit their greatest differences for the first three radial modes and for orders less than about 15. The number of maxima and minima for the group velocity curves increases with radial mode number i. Curves connecting corresponding maxima and minima tend toward the value U/VS0=≒1.2 as the period decreases to zero; in the case of the homogeneous sphere these curves approach 1.3. 3. The amplitudes of the Common Spectrum suggest that higher radial modes with i≥10 may still give appreciable contributions to the theoretical seismogram. 4. The Rayleigh wave shows a simple disturbance consisting of approximately one cycle of oscillation. The pattern of wave propagation can be explained by the concept of dispersion. 5. The convergence of the wave form of the P wave by the successive addition of radial higher modes is not so rapid as in the case without gravity. The slower convergence is caused by the difference of the time and space functions of the applied forces and by the minimum values of period employed in the synthesis. 6. The orbital motion of the Rayleigh wave shows a phase advance of π/2 near the antipode. 7. In the seismograms showing body waves, the surface-reflected S waves end abruptly near the travel time of a wave propagating along the surface with the shear wave velocity. 8. The variation of amplitude of the body waves as a function of epicentral distance can be explained by the theory of the divergence factor, after accounting for the effect of reflection at the surface.|1.我々は弾性球の自由振動周期や理論地震記象に及ぼす重力の影響を研究して来たが,その第3報として,流体核のある等方等質マントルの場合のスフェロイド型振動の理論地震記象を作つた.方法は従来と同じで,変位をいろいろな固有振動のモードの和として表わした.
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 46, 号 4, p. 791-819, 発行日 1968-10-31
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
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