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Relative Sea‐Level Changes Over the Past Centuries in the Central Ryukyu Arc Inferred From Coral Microatolls
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...
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Published in: | Journal of geophysical research. Solid earth 2020-02, Vol.125 (2), p.n/a |
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creator | Weil‐Accardo, J. Feuillet, N. Satake, K. Goto, T. Goto, K. Harada, T. Kayanne, H. Nakamura, M. Ramos, N. Saurel, J.‐M. Sowa, K. Liu, S.‐C. Yu, T.‐L. Shen, C.‐C. |
description | 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.
Key Points
Relative sea‐level changes due to climate and tectonics recorded by coral microatolls
Record of vertical deformations related to the seismic cycle of the Ryukyu subduction zone
Coupling variability of the Ryukyu subduction zone |
doi_str_mv | 10.1029/2019JB018466 |
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Key Points
Relative sea‐level changes due to climate and tectonics recorded by coral microatolls
Record of vertical deformations related to the seismic cycle of the Ryukyu subduction zone
Coupling variability of the Ryukyu subduction zone</description><identifier>ISSN: 2169-9313</identifier><identifier>EISSN: 2169-9356</identifier><identifier>DOI: 10.1029/2019JB018466</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>coral microatolls ; Corals ; Dislocation models ; Earth Sciences ; Emergence ; Fossils ; Geophysics ; Microatolls ; Records ; relative sea‐level ; Ryukyu subduction zone ; Sciences of the Universe ; Sea level rise ; seismic cycle ; Signal processing ; Subduction ; Subduction (geology) ; Subduction zones ; Submergence ; Tectonics ; Transition zone</subject><ispartof>Journal of geophysical research. Solid earth, 2020-02, Vol.125 (2), p.n/a</ispartof><rights>2019. American Geophysical Union. All Rights Reserved.</rights><rights>2020. American Geophysical Union. All Rights Reserved.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3843-b40333ddf93449f28e33909f8faf2e643a09f3f0616ffdc3e7b212ec000423c83</citedby><cites>FETCH-LOGICAL-a3843-b40333ddf93449f28e33909f8faf2e643a09f3f0616ffdc3e7b212ec000423c83</cites><orcidid>0000-0001-6497-817X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,778,782,883,27907,27908</link.rule.ids><backlink>$$Uhttps://insu.hal.science/insu-03164037$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Weil‐Accardo, J.</creatorcontrib><creatorcontrib>Feuillet, N.</creatorcontrib><creatorcontrib>Satake, K.</creatorcontrib><creatorcontrib>Goto, T.</creatorcontrib><creatorcontrib>Goto, K.</creatorcontrib><creatorcontrib>Harada, T.</creatorcontrib><creatorcontrib>Kayanne, H.</creatorcontrib><creatorcontrib>Nakamura, M.</creatorcontrib><creatorcontrib>Ramos, N.</creatorcontrib><creatorcontrib>Saurel, J.‐M.</creatorcontrib><creatorcontrib>Sowa, K.</creatorcontrib><creatorcontrib>Liu, S.‐C.</creatorcontrib><creatorcontrib>Yu, T.‐L.</creatorcontrib><creatorcontrib>Shen, C.‐C.</creatorcontrib><title>Relative Sea‐Level Changes Over the Past Centuries in the Central Ryukyu Arc Inferred From Coral Microatolls</title><title>Journal of geophysical research. Solid earth</title><description>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.
Key Points
Relative sea‐level changes due to climate and tectonics recorded by coral microatolls
Record of vertical deformations related to the seismic cycle of the Ryukyu subduction zone
Coupling variability of the Ryukyu subduction zone</description><subject>coral microatolls</subject><subject>Corals</subject><subject>Dislocation models</subject><subject>Earth Sciences</subject><subject>Emergence</subject><subject>Fossils</subject><subject>Geophysics</subject><subject>Microatolls</subject><subject>Records</subject><subject>relative sea‐level</subject><subject>Ryukyu subduction zone</subject><subject>Sciences of the Universe</subject><subject>Sea level rise</subject><subject>seismic cycle</subject><subject>Signal processing</subject><subject>Subduction</subject><subject>Subduction (geology)</subject><subject>Subduction zones</subject><subject>Submergence</subject><subject>Tectonics</subject><subject>Transition zone</subject><issn>2169-9313</issn><issn>2169-9356</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kUtOwzAQhiMEEgjYcQBL7BAF25O68bJE9IGCigqsLTcd00BIip0UZccROELP0qNwElwFIVbMZmb--TQPTRCcMHrBKJeXnDJ5c0VZFAqxExxwJmRHQlfs_sYM9oNj556pt8hLLDwIllPMdZWtkNyj_vr4THCFOYkXunhCRyYrtKRaILnTriIxFlVtM69nxWbt5c16K1mdk2lTvzQ16duUjAuD1uKcDGz5SuJyW77NUlvqqsxzdxTsGZ07PP7xh8Hj4PohHnWSyXAc95OOhiiEziykADCfGwlhKA2PEEBSaSKjDUcRgvYJGCqYMGaeAvZmnHFM_WkhhzSCw-Cs7bvQuVra7FXbRpU6U6N-orLC1YoCE35Kb8U8fNrCS1u-1egq9VzWtvD7KQ5CQo9Cl3vqvKX8Mc5ZNL99GVXbH6i_P_A4tPh7lmPzL6tuhtOrLkgG8A2sUIjB</recordid><startdate>202002</startdate><enddate>202002</enddate><creator>Weil‐Accardo, J.</creator><creator>Feuillet, N.</creator><creator>Satake, K.</creator><creator>Goto, T.</creator><creator>Goto, K.</creator><creator>Harada, T.</creator><creator>Kayanne, H.</creator><creator>Nakamura, M.</creator><creator>Ramos, N.</creator><creator>Saurel, J.‐M.</creator><creator>Sowa, K.</creator><creator>Liu, S.‐C.</creator><creator>Yu, T.‐L.</creator><creator>Shen, C.‐C.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7TG</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>SOI</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-6497-817X</orcidid></search><sort><creationdate>202002</creationdate><title>Relative Sea‐Level Changes Over the Past Centuries in the Central Ryukyu Arc Inferred From Coral Microatolls</title><author>Weil‐Accardo, J. ; Feuillet, N. ; Satake, K. ; Goto, T. ; Goto, K. ; Harada, T. ; Kayanne, H. ; Nakamura, M. ; Ramos, N. ; Saurel, J.‐M. ; Sowa, K. ; Liu, S.‐C. ; Yu, T.‐L. ; Shen, C.‐C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3843-b40333ddf93449f28e33909f8faf2e643a09f3f0616ffdc3e7b212ec000423c83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>coral microatolls</topic><topic>Corals</topic><topic>Dislocation models</topic><topic>Earth Sciences</topic><topic>Emergence</topic><topic>Fossils</topic><topic>Geophysics</topic><topic>Microatolls</topic><topic>Records</topic><topic>relative sea‐level</topic><topic>Ryukyu subduction zone</topic><topic>Sciences of the Universe</topic><topic>Sea level rise</topic><topic>seismic cycle</topic><topic>Signal processing</topic><topic>Subduction</topic><topic>Subduction (geology)</topic><topic>Subduction zones</topic><topic>Submergence</topic><topic>Tectonics</topic><topic>Transition zone</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Weil‐Accardo, J.</creatorcontrib><creatorcontrib>Feuillet, N.</creatorcontrib><creatorcontrib>Satake, K.</creatorcontrib><creatorcontrib>Goto, T.</creatorcontrib><creatorcontrib>Goto, K.</creatorcontrib><creatorcontrib>Harada, T.</creatorcontrib><creatorcontrib>Kayanne, H.</creatorcontrib><creatorcontrib>Nakamura, M.</creatorcontrib><creatorcontrib>Ramos, N.</creatorcontrib><creatorcontrib>Saurel, J.‐M.</creatorcontrib><creatorcontrib>Sowa, K.</creatorcontrib><creatorcontrib>Liu, S.‐C.</creatorcontrib><creatorcontrib>Yu, T.‐L.</creatorcontrib><creatorcontrib>Shen, C.‐C.</creatorcontrib><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Journal of geophysical research. Solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Weil‐Accardo, J.</au><au>Feuillet, N.</au><au>Satake, K.</au><au>Goto, T.</au><au>Goto, K.</au><au>Harada, T.</au><au>Kayanne, H.</au><au>Nakamura, M.</au><au>Ramos, N.</au><au>Saurel, J.‐M.</au><au>Sowa, K.</au><au>Liu, S.‐C.</au><au>Yu, T.‐L.</au><au>Shen, C.‐C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Relative Sea‐Level Changes Over the Past Centuries in the Central Ryukyu Arc Inferred From Coral Microatolls</atitle><jtitle>Journal of geophysical research. Solid earth</jtitle><date>2020-02</date><risdate>2020</risdate><volume>125</volume><issue>2</issue><epage>n/a</epage><issn>2169-9313</issn><eissn>2169-9356</eissn><abstract>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.
Key Points
Relative sea‐level changes due to climate and tectonics recorded by coral microatolls
Record of vertical deformations related to the seismic cycle of the Ryukyu subduction zone
Coupling variability of the Ryukyu subduction zone</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2019JB018466</doi><tpages>31</tpages><orcidid>https://orcid.org/0000-0001-6497-817X</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | coral microatolls Corals Dislocation models Earth Sciences Emergence Fossils Geophysics Microatolls Records relative sea‐level Ryukyu subduction zone Sciences of the Universe Sea level rise seismic cycle Signal processing Subduction Subduction (geology) Subduction zones Submergence Tectonics Transition zone |
title | Relative Sea‐Level Changes Over the Past Centuries in the Central Ryukyu Arc Inferred From Coral Microatolls |
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