{"id":293,"date":"2014-06-14T19:59:06","date_gmt":"2014-06-15T02:59:06","guid":{"rendered":"http:\/\/carolinebeghein.com\/?page_id=293"},"modified":"2020-09-17T07:22:50","modified_gmt":"2020-09-17T14:22:50","slug":"sv-anisotropy-mantle-transition-zone","status":"publish","type":"page","link":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/research\/global-tomography\/sv-anisotropy-mantle-transition-zone\/","title":{"rendered":"SV Anisotropy in the Transition Zone"},"content":{"rendered":"<p><span style=\"color: #ff0000;\">Model Download<\/span>: Our global model YB13SVani can be found <strong><a href=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/Downloads\/MODELS\/YB13SVani.tar.gz\">here<\/a><\/strong>\u00a0the local reference models used (PREM + CRUST2.0) can be downloaded\u00a0<strong><a href=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/Downloads\/MODELS\/Local1DModelsYB2013.tar\">here<\/a><\/strong>.<\/p>\n<p><b>Citation<\/b>:<\/p>\n<p><a title=\"Preprint\" href=\"http:\/\/moho.ess.ucla.edu\/~cbeghein\/PDFS\/2013_YuanBeghein_epsl_preprint.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"alignnone wp-image-531 size-full\" src=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/lnk.gif\" alt=\"lnk\" width=\"22\" height=\"24\" \/><\/a>\u00a0*Yuan, K., and <b>Beghein, C<\/b>., Seismic anisotropy changes across upper mantle phase transitions, Earth and Planet. Sci. Lett., 374, 132-144, <a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0012821X13002768\">doi: 10.1016\/j.epsl.2013.05.031<\/a>, 2013 &#8211; Article usage report <a href=\"http:\/\/usagereports.elsevier.com\/asp\/Main.aspx?Server=MI02QAP01027&amp;Project=Elsevier+Author+Alert&amp;port=0&amp;evt=2048001&amp;src=Main.aspx.2048001&amp;documentID=B0652B4C4F6396AED258B5B32105FD5D&amp;uid=Author&amp;pwd=X&amp;elementsPromptAnswers=8D65C0734270828F9D65559C052AC751;8D65C0734270828F9D65559C052AC751:7202F748B732C48B0AA345C806B8C67A&amp;hiddensections=header,path,dockTop,dockLeft,footer\">here<\/a><\/p>\n<figure id=\"attachment_296\" aria-describedby=\"caption-attachment-296\" style=\"width: 792px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-296 size-full\" src=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png\" alt=\"150km_map\" width=\"792\" height=\"612\" srcset=\"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png 792w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-300x232.png 300w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-668x516.png 668w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-600x464.png 600w\" sizes=\"(max-width: 792px) 100vw, 792px\" \/><\/a><figcaption id=\"caption-attachment-296\" class=\"wp-caption-text\">Azimuthal anisotropy model at 150km depth<\/figcaption><\/figure>\n<figure id=\"attachment_298\" aria-describedby=\"caption-attachment-298\" style=\"width: 792px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/TZ_map.png\"><img decoding=\"async\" class=\"wp-image-298 size-full\" src=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/TZ_map.png\" alt=\"TZ_map\" width=\"792\" height=\"612\" srcset=\"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/TZ_map.png 792w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/TZ_map-300x232.png 300w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/TZ_map-668x516.png 668w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/TZ_map-600x464.png 600w\" sizes=\"(max-width: 792px) 100vw, 792px\" \/><\/a><figcaption id=\"caption-attachment-298\" class=\"wp-caption-text\">Azimuthal anisotropy model at 600 km depth<\/figcaption><\/figure>\n<p style=\"color: #515151;\">The red bars in the maps above represent the fast direction of propagation for vertically polarized S-waves, and is generally considered a good proxy for mantle flow direction in the uppermost mantle. We see that the fast axes direction is generally different in the transition zone and that the change occurs at the TZ boundaries. This could indicate changes in mantle flow. However, the relation between seismic anisotropy and flow at these depths is unknown and the change in seismic anisotropy could simply result from recrystallization during the phase change even if flow direction does not change.<\/p>\n<figure id=\"attachment_297\" aria-describedby=\"caption-attachment-297\" style=\"width: 612px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/SKSamp.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-297 size-full\" src=\"http:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/SKSamp.png\" alt=\"Shear-wave splitting delay times: We found that having azimuthal anisotropy in the transition zone (bottom panel) helps reconciling measured shear-wave splitting delay times and predictions from surface wave. Models that do not have deep anisotropy (top panel) largely underestimate the delay times. \" width=\"612\" height=\"666\" srcset=\"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/SKSamp.png 612w, https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/SKSamp-276x300.png 276w\" sizes=\"(max-width: 612px) 100vw, 612px\" \/><\/a><figcaption id=\"caption-attachment-297\" class=\"wp-caption-text\">Shear-wave splitting delay times: We found that having azimuthal anisotropy in the transition zone (bottom panel) helps reconciling measured shear-wave splitting delay times and predictions from surface wave. Models that do not have deep anisotropy (top panel) largely underestimate the delay times.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Model Download: Our global model YB13SVani can be found here\u00a0the local reference models used (PREM + CRUST2.0) can be downloaded\u00a0here. Citation: \u00a0*Yuan, K., and Beghein, C., Seismic anisotropy changes across upper mantle phase transitions, Earth and Planet. Sci. Lett., 374, 132-144, doi: 10.1016\/j.epsl.2013.05.031, 2013 &#8211; Article usage report here The red bars in the maps &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/research\/global-tomography\/sv-anisotropy-mantle-transition-zone\/\" class=\"more-link\">Read more<span class=\"screen-reader-text\"> &#8220;SV Anisotropy in the Transition Zone&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":296,"parent":175,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inspiro_hide_title":false,"footnotes":""},"class_list":["post-293","page","type-page","status-publish","has-post-thumbnail","hentry"],"jetpack_sharing_enabled":false,"featured_media_urls":{"thumbnail":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-150x150.png",150,150,true],"medium":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-300x232.png",300,232,true],"medium_large":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",768,593,false],"large":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"1536x1536":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"2048x2048":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"inspiro-featured-image":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"inspiro-loop":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-792x320.png",792,320,true],"inspiro-loop@2x":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"portfolio_item-thumbnail":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-600x400.png",600,400,true],"portfolio_item-thumbnail@2x":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"portfolio_item-masonry":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-600x464.png",600,464,true],"portfolio_item-masonry@2x":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"portfolio_item-thumbnail_cinema":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-792x335.png",792,335,true],"portfolio_item-thumbnail_portrait":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map-600x612.png",600,612,true],"portfolio_item-thumbnail_portrait@2x":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false],"portfolio_item-thumbnail_square":["https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-content\/uploads\/2014\/06\/150km_map.png",792,612,false]},"_links":{"self":[{"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/pages\/293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/comments?post=293"}],"version-history":[{"count":13,"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/pages\/293\/revisions"}],"predecessor-version":[{"id":2782,"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/pages\/293\/revisions\/2782"}],"up":[{"embeddable":true,"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/pages\/175"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/media\/296"}],"wp:attachment":[{"href":"https:\/\/faculty.epss.ucla.edu\/~cbeghein\/wp-json\/wp\/v2\/media?parent=293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}