Relative Sea‐Level Changes Over the Past Centuries in the Central Ryukyu Arc Inferred From Coral Microatolls
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- J. Weil‐Accardo
- Now at CEREGE Aix‐Marseille University Aix‐en Provence France
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- N. Feuillet
- Institut de Physique du Globe de Paris Sorbonne Paris University, Paris‐Diderot University, UMR 7154 Paris France
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- K. Satake
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- T. Goto
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- K. Goto
- International Research Institute of Disaster Science Tohoku University Sendai Japan
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- T. Harada
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- H. Kayanne
- Department of Earth and Planetary Science University of Tokyo Tokyo Japan
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- M. Nakamura
- Faculty of Science University of the Ryukyus Okinawa Japan
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- N. Ramos
- National Institute of Geological Sciences University of the Philippines‐Diliman Quezon City Philippines
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- J.‐M. Saurel
- Institut de Physique du Globe de Paris Sorbonne Paris University, Paris‐Diderot University, UMR 7154 Paris France
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- K. Sowa
- Japan Agency for Marine‐Earth Science and Technology Kanagawa Japan
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- S.‐C. Liu
- Department of Geosciences National Taiwan University Taipei Taiwan ROC
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- T.‐L. Yu
- Now at CEREGE Aix‐Marseille University Aix‐en Provence France
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- C.‐C. Shen
- Now at CEREGE Aix‐Marseille University Aix‐en Provence France
書誌事項
- 公開日
- 2020-02
- 資源種別
- journal article
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2019jb018466
- 公開者
- American Geophysical Union (AGU)
この論文をさがす
説明
<jats:title>Abstract</jats:title><jats:p>This study focuses on Okinawa and Yoron islands, in order to better understand tectonics in the Ryukyu Arc related to the subduction zone. We used coral microatolls—known for their centimetric accuracy in the record of relative sea‐level (RSL) changes—to reconstruct RSL changes over the last century from living microatolls. A fossil microatoll in Yoron was used to discuss possible RSL changes beyond the last century. The signal consists of emergence whose rate varies through time, interrupted by decadal to multidecadal periods of sudden and/or gradual submergence and by interannual sea‐level falls. Comparison with other existing RSL records in the arc highlights RSL variability along the arc. This pattern contrasts with the homogeneous and linear absolute regional sea‐level rise, implying that this latter signal cannot fully explain our observations and that an additional process is required. We suggest the subduction zone as a possible source for generating centimetric scale RSL changes observed in coral microatolls. We tested how the Ryukyu megathrust could explain our observations with elastic dislocation modeling. The emergence trend could be explained by interseismic loading on the plate interface with a minimum coupling rate of 25%, which is higher than previous estimates based on short instrumental records. As for the submergence events that occurred regularly in the coral record, we show that they could be explained by slow slip events on the shallower part of the megathrust or in the transition zone. Such process could accommodate a significant part of the total convergence.</jats:p>
収録刊行物
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- Journal of Geophysical Research: Solid Earth
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Journal of Geophysical Research: Solid Earth 125 (2), 2020-02
American Geophysical Union (AGU)
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キーワード
詳細情報 詳細情報について
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- CRID
- 1360005518173438592
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- ISSN
- 21699356
- 21699313
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
