Investigation of time dependent inner core structure by the analysis of free oscillation spectra

• Sharrock D. S.

  Department of Earth Sciences, Oxford University

• Woodhouse J. H.

  Department of Earth Sciences, Oxford University

抄録

Proposals that the seismic structure of the Earth's inner core is time-dependent are investigated using the splitting functions of free oscillations, determined from seismic data recorded over some 20 years. It is shown that the data support some time-dependence, although the paucity of the data for the 1970's and 1980's makes it difficult to be certain of the precise form of such time dependence. The data do not support a positive (i.e. West-to-East) rotation; rather, the inferred rotational component of the time-dependent inner core structure is negative (i.e. East-to-West), and varies according to the mode under consideration from less than 1° per year to more than 2° per year. The analysis suggests that inner core structure is time-dependent but that the dependence is not well explained by differential rotation of the inner core. This kind of analysis will become much more powerful with increasing quantities of data over a longer time span.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 50 (11-12), 1013-1018, 1998

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390282681485719296
• NII論文ID: 10003736670
• NII論文ID: 130003955885
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03352195
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 1951723
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I1951723
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03352195.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03352195/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03352195
• 本文言語コード: en
• データソース種別:
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  • NDL
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