D″ discontinuity structure beneath the North Atlantic from Scd observations
We analyzed transverse and radial component recordings from the 2010 M6.3 southern Spain earthquake (depth = 620 km) recorded on 370 broadband stations in North America. We grouped these seismograms into subarrays and applied fourth root vespa processing (vespagram analysis) in order to enhance low‐...
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| Veröffentlicht in: | Geophysical research letters 2015-05, Vol.42 (10), p.3793-3801 |
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| container_title | Geophysical research letters |
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| creator | Yao, Yao Whittaker, Stefanie Thorne, Michael S. |
| description | We analyzed transverse and radial component recordings from the 2010 M6.3 southern Spain earthquake (depth = 620 km) recorded on 370 broadband stations in North America. We grouped these seismograms into subarrays and applied fourth root vespa processing (vespagram analysis) in order to enhance low‐amplitude arrivals. These vespagrams show clear Scd arrivals which indicate the existence of the D″ discontinuity beneath the North Atlantic Ocean (45–60°N, 45–55°W). These observations are best fit with a +2–4% velocity increase at the top of the D″ discontinuity at a height above the core‐mantle boundary of 304 ± 14 km. We do not observe Scd arrivals at the eastern end of our study region which is consistent with the presence of the easternmost edge of the ancient Farallon plate.
Key Points
D″ discontinuity beneath North Atlantic is detected with 304 km average thickness
D″ discontinuity is not laterally continuous in the region
Discontinuity termination may be due to the eastern edge of the Farallon plate |
| doi_str_mv | 10.1002/2015GL063989 |
| format | Article |
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Key Points
D″ discontinuity beneath North Atlantic is detected with 304 km average thickness
D″ discontinuity is not laterally continuous in the region
Discontinuity termination may be due to the eastern edge of the Farallon plate</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/2015GL063989</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Amplitude ; array ; body waves ; Broadband ; Core-mantle boundary ; Depth ; Discontinuity ; Earthquakes ; Height ; mantle discontinuities ; Oceanography ; Plate tectonics ; Seismic activity ; Seismograms ; Seismology ; Velocity</subject><ispartof>Geophysical research letters, 2015-05, Vol.42 (10), p.3793-3801</ispartof><rights>2015. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4943-981e4fc17a113d7c9f8131f75a5aba3adef4660edbb23ea31c36b924de888b383</citedby><cites>FETCH-LOGICAL-a4943-981e4fc17a113d7c9f8131f75a5aba3adef4660edbb23ea31c36b924de888b383</cites><orcidid>0000-0002-4403-5753</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2015GL063989$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2015GL063989$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,11514,27924,27925,45574,45575,46409,46468,46833,46892</link.rule.ids></links><search><creatorcontrib>Yao, Yao</creatorcontrib><creatorcontrib>Whittaker, Stefanie</creatorcontrib><creatorcontrib>Thorne, Michael S.</creatorcontrib><title>D″ discontinuity structure beneath the North Atlantic from Scd observations</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>We analyzed transverse and radial component recordings from the 2010 M6.3 southern Spain earthquake (depth = 620 km) recorded on 370 broadband stations in North America. We grouped these seismograms into subarrays and applied fourth root vespa processing (vespagram analysis) in order to enhance low‐amplitude arrivals. These vespagrams show clear Scd arrivals which indicate the existence of the D″ discontinuity beneath the North Atlantic Ocean (45–60°N, 45–55°W). These observations are best fit with a +2–4% velocity increase at the top of the D″ discontinuity at a height above the core‐mantle boundary of 304 ± 14 km. We do not observe Scd arrivals at the eastern end of our study region which is consistent with the presence of the easternmost edge of the ancient Farallon plate.
Key Points
D″ discontinuity beneath North Atlantic is detected with 304 km average thickness
D″ discontinuity is not laterally continuous in the region
Discontinuity termination may be due to the eastern edge of the Farallon plate</description><subject>Amplitude</subject><subject>array</subject><subject>body waves</subject><subject>Broadband</subject><subject>Core-mantle boundary</subject><subject>Depth</subject><subject>Discontinuity</subject><subject>Earthquakes</subject><subject>Height</subject><subject>mantle discontinuities</subject><subject>Oceanography</subject><subject>Plate tectonics</subject><subject>Seismic activity</subject><subject>Seismograms</subject><subject>Seismology</subject><subject>Velocity</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp90LFOwzAQBmALgUQpbDxAJFYCZztx7LEqEBBpERTU0XISR01p42I7QDfeiTfiSQgqQkyd7h--_046hI4xnGEAck4Ax2kGjAoudlAPiygKOUCyi3oAosskYfvowLk5AFCguIdGF18fn0FZu8I0vm7a2q8D521b-NbqINeNVn4W-JkOxsZ2aeAXqoNFUFmzDCZFGZjcafuqfG0ad4j2KrVw-uh39tHT1eXj8DrM7tKb4SALVSQiGgqOdVQVOFEY0zIpRMUxxVUSq1jliqpSVxFjoMs8J1QrigvKckGiUnPOc8ppH51s9q6seWm183JuWtt0JyUWGDhniWBbFeOigwTiTp1uVGGNc1ZXcmXrpbJriUH-vFX-f2vHyYa_1Qu93mpl-pDFRMS0K4WbUu28fv8rKfssWUKTWE7HqSR8Mrq_nQ4lpt_ziogk</recordid><startdate>20150528</startdate><enddate>20150528</enddate><creator>Yao, Yao</creator><creator>Whittaker, Stefanie</creator><creator>Thorne, Michael S.</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</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><orcidid>https://orcid.org/0000-0002-4403-5753</orcidid></search><sort><creationdate>20150528</creationdate><title>D″ discontinuity structure beneath the North Atlantic from Scd observations</title><author>Yao, Yao ; Whittaker, Stefanie ; Thorne, Michael S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4943-981e4fc17a113d7c9f8131f75a5aba3adef4660edbb23ea31c36b924de888b383</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Amplitude</topic><topic>array</topic><topic>body waves</topic><topic>Broadband</topic><topic>Core-mantle boundary</topic><topic>Depth</topic><topic>Discontinuity</topic><topic>Earthquakes</topic><topic>Height</topic><topic>mantle discontinuities</topic><topic>Oceanography</topic><topic>Plate tectonics</topic><topic>Seismic activity</topic><topic>Seismograms</topic><topic>Seismology</topic><topic>Velocity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yao, Yao</creatorcontrib><creatorcontrib>Whittaker, Stefanie</creatorcontrib><creatorcontrib>Thorne, Michael S.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</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><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yao, Yao</au><au>Whittaker, Stefanie</au><au>Thorne, Michael S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>D″ discontinuity structure beneath the North Atlantic from Scd observations</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2015-05-28</date><risdate>2015</risdate><volume>42</volume><issue>10</issue><spage>3793</spage><epage>3801</epage><pages>3793-3801</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>We analyzed transverse and radial component recordings from the 2010 M6.3 southern Spain earthquake (depth = 620 km) recorded on 370 broadband stations in North America. We grouped these seismograms into subarrays and applied fourth root vespa processing (vespagram analysis) in order to enhance low‐amplitude arrivals. These vespagrams show clear Scd arrivals which indicate the existence of the D″ discontinuity beneath the North Atlantic Ocean (45–60°N, 45–55°W). These observations are best fit with a +2–4% velocity increase at the top of the D″ discontinuity at a height above the core‐mantle boundary of 304 ± 14 km. We do not observe Scd arrivals at the eastern end of our study region which is consistent with the presence of the easternmost edge of the ancient Farallon plate.
Key Points
D″ discontinuity beneath North Atlantic is detected with 304 km average thickness
D″ discontinuity is not laterally continuous in the region
Discontinuity termination may be due to the eastern edge of the Farallon plate</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2015GL063989</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0002-4403-5753</orcidid></addata></record> |
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| ispartof | Geophysical research letters, 2015-05, Vol.42 (10), p.3793-3801 |
| issn | 0094-8276 1944-8007 |
| language | eng |
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| source | Access via Wiley Online Library; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals; Wiley Online Library (Open Access Collection) |
| subjects | Amplitude array body waves Broadband Core-mantle boundary Depth Discontinuity Earthquakes Height mantle discontinuities Oceanography Plate tectonics Seismic activity Seismograms Seismology Velocity |
| title | D″ discontinuity structure beneath the North Atlantic from Scd observations |
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