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  1. D300 大学院環境学研究科
  2. D300a 雑誌掲載論文
  3. 学術雑誌

Strain rate dependency of oceanic intraplate earthquake b-values at extremely low strain rates

http://hdl.handle.net/2237/25180
http://hdl.handle.net/2237/25180
de82b4c5-1d20-4038-92cd-d8e0c14cbf01
名前 / ファイル ライセンス アクション
Sasajima_et_al-2016-Journal_of_Geophysical_Research_Solid_Earth.pdf Sasajima_et_al-2016-Journal_of_Geophysical_Research_Solid_Earth.pdf ファイル公開:2017/12/29 (1.7 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2016-12-12
タイトル
タイトル Strain rate dependency of oceanic intraplate earthquake b-values at extremely low strain rates
言語 en
著者 Sasajima, Ryohei

× Sasajima, Ryohei

WEKO 67952

en Sasajima, Ryohei

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Ito, Takeo

× Ito, Takeo

WEKO 67953

en Ito, Takeo

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 © 2016 American Geophysical Union
抄録
内容記述 We discovered a clear positive dependence of oceanic intraplate earthquake (OCEQ) b-values on the age of the oceanic lithosphere. OCEQ b-values in the youngest (<10 Ma) oceanic lithosphere are around 1.0, while those in middle to old (>20 Ma) oceanic lithosphere exceed 1.5, which is significantly higher than the average worldwide earthquake b-value (around 1.0). On the other hand, the b-value of intraplate earthquakes in the Ninety East-Sumatra orogen, where oceanic lithosphere has an anomalously higher strain rate compared with normal oceanic lithosphere, is 0.93, which is significantly lower than the OCEQ b-value (about 1.9) with the same age (50–110 Ma). Thus, the variation in b-values relates to the strain rate of the oceanic lithosphere and is not caused by a difference in thermal structure. We revealed a negative strain rate dependency of the b-value at extremely low strain rates (<2 × 10−10/year), which can clearly explain the above b-values. We propose that the OCEQ b-value depends strongly on strain rate (either directly or indirectly) at extremely low strain rates. The high OCEQ b-values (>1.5) in oceanic lithosphere >20 Ma old imply that future improvement in seismic observation will capture many smaller magnitude OCEQs, which will provide valuable information on the evolution of the oceanic lithosphere and the driving mechanism of plate tectonics.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 Wiley
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1002/2016JB013221
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-9356
書誌情報 en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH

巻 121, 号 6, p. 4523-4537, 発行日 2016-06-29
著者版フラグ
値 publisher
URI
識別子 http://doi.org/10.1002/2016JB013221
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/25180
識別子タイプ HDL
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