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Shear wave anisotropy of textured hcp-Fe in the Earth's inner core
Many seismological studies have confirmed that Vp travels 3–4% faster along the rotation axis of the Earth than along the equatorial plane in the inner core, indicating that the inner core is elastically anisotropic. However, seismic and mineral physics observations of the polarized Vs are still eme...
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| Published in: | Earth and planetary science letters 2010-10, Vol.298 (3), p.361-366 |
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| Main Authors: | , , , , |
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| container_end_page | 366 |
| container_issue | 3 |
| container_start_page | 361 |
| container_title | Earth and planetary science letters |
| container_volume | 298 |
| creator | Lin, Jung-Fu Mao, Zhu Yavaş, Hasan Zhao, Jiyong Dubrovinsky, Leonid |
| description | Many seismological studies have confirmed that Vp travels 3–4% faster along the rotation axis of the Earth than along the equatorial plane in the inner core, indicating that the inner core is elastically anisotropic. However, seismic and mineral physics observations of the polarized Vs are still emerging. Thus far, the Vs anisotropy of the constitute iron crystals at relevant pressures of the Earth's core has remained mostly theoretical mainly because of the technical difficulties involved in measuring reliable Vs velocities of iron crystals. Here we have measured azimuthal Vs anisotropy of highly textured hcp-Fe at high pressures using nuclear resonant inelastic X-ray scattering, a technique sensitive to Vs, in a diamond anvil cell. Our results show that the azimuthal Vs is 2–4% faster along the crystallographic
c axis than along the
a axis at 158
GPa and 172
GPa. If one describes the Vp anisotropy of the inner core as a result of the textured hcp-Fe crystals, it is conceivable that azimuthal and polarized Vs anisotropies with a magnitude of a few percent also exist in the region. Since Vp and Vs of candidate iron phases behave quite differently in theoretical predictions, our results here indicate that future seismic observations of the Vs and Vp anisotropies of the inner core thus hold the key to deciphering the causes for the seismic and dynamic signatures as well as constitute iron phase(s) of the region. |
| doi_str_mv | 10.1016/j.epsl.2010.08.006 |
| format | article |
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c axis than along the
a axis at 158
GPa and 172
GPa. If one describes the Vp anisotropy of the inner core as a result of the textured hcp-Fe crystals, it is conceivable that azimuthal and polarized Vs anisotropies with a magnitude of a few percent also exist in the region. Since Vp and Vs of candidate iron phases behave quite differently in theoretical predictions, our results here indicate that future seismic observations of the Vs and Vp anisotropies of the inner core thus hold the key to deciphering the causes for the seismic and dynamic signatures as well as constitute iron phase(s) of the region.</description><identifier>ISSN: 0012-821X</identifier><identifier>EISSN: 1385-013X</identifier><identifier>DOI: 10.1016/j.epsl.2010.08.006</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Anisotropy ; Crystals ; Earth ; Earth core ; Earth's inner core ; elastic properties ; high pressure ; Iron ; Phases ; Seismic engineering ; Seismic phenomena ; seismology</subject><ispartof>Earth and planetary science letters, 2010-10, Vol.298 (3), p.361-366</ispartof><rights>2010</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a448t-954dadfb9f4088fe231a929bce9ade97e261098f6cf77f177ac1a111855953923</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Lin, Jung-Fu</creatorcontrib><creatorcontrib>Mao, Zhu</creatorcontrib><creatorcontrib>Yavaş, Hasan</creatorcontrib><creatorcontrib>Zhao, Jiyong</creatorcontrib><creatorcontrib>Dubrovinsky, Leonid</creatorcontrib><title>Shear wave anisotropy of textured hcp-Fe in the Earth's inner core</title><title>Earth and planetary science letters</title><description>Many seismological studies have confirmed that Vp travels 3–4% faster along the rotation axis of the Earth than along the equatorial plane in the inner core, indicating that the inner core is elastically anisotropic. However, seismic and mineral physics observations of the polarized Vs are still emerging. Thus far, the Vs anisotropy of the constitute iron crystals at relevant pressures of the Earth's core has remained mostly theoretical mainly because of the technical difficulties involved in measuring reliable Vs velocities of iron crystals. Here we have measured azimuthal Vs anisotropy of highly textured hcp-Fe at high pressures using nuclear resonant inelastic X-ray scattering, a technique sensitive to Vs, in a diamond anvil cell. Our results show that the azimuthal Vs is 2–4% faster along the crystallographic
c axis than along the
a axis at 158
GPa and 172
GPa. If one describes the Vp anisotropy of the inner core as a result of the textured hcp-Fe crystals, it is conceivable that azimuthal and polarized Vs anisotropies with a magnitude of a few percent also exist in the region. Since Vp and Vs of candidate iron phases behave quite differently in theoretical predictions, our results here indicate that future seismic observations of the Vs and Vp anisotropies of the inner core thus hold the key to deciphering the causes for the seismic and dynamic signatures as well as constitute iron phase(s) of the region.</description><subject>Anisotropy</subject><subject>Crystals</subject><subject>Earth</subject><subject>Earth core</subject><subject>Earth's inner core</subject><subject>elastic properties</subject><subject>high pressure</subject><subject>Iron</subject><subject>Phases</subject><subject>Seismic engineering</subject><subject>Seismic phenomena</subject><subject>seismology</subject><issn>0012-821X</issn><issn>1385-013X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LAzEQhoMoWKt_wFNuPe2ayX4l4EWLVaHgQYXeQpqdsFu2mzVJq_33bqlnT8M7PO_APITcAkuBQXm3SXEIXcrZuGAiZaw8IxPIRJEwyFbnZMIY8ERwWF2SqxA2bCSKUk7I43uD2tNvvUeq-za46N1woM7SiD9x57GmjRmSBdK2p7FB-qR9bGZhjD16apzHa3JhdRfw5m9Oyefi6WP-kizfnl_nD8tE57mIiSzyWtd2LW3OhLDIM9CSy7VBqWuUFfISmBS2NLaqLFSVNqABQBSFLDLJsymZne4O3n3tMES1bYPBrtM9ul1QIgOQoshhJPmJNN6F4NGqwbdb7Q8KmDr6Uht19KWOvhQTarQxlu5PJRx_2LfoVTAt9gbr1qOJqnbtf_Vf-1VzOQ</recordid><startdate>20101001</startdate><enddate>20101001</enddate><creator>Lin, Jung-Fu</creator><creator>Mao, Zhu</creator><creator>Yavaş, Hasan</creator><creator>Zhao, Jiyong</creator><creator>Dubrovinsky, Leonid</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SM</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>20101001</creationdate><title>Shear wave anisotropy of textured hcp-Fe in the Earth's inner core</title><author>Lin, Jung-Fu ; Mao, Zhu ; Yavaş, Hasan ; Zhao, Jiyong ; Dubrovinsky, Leonid</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a448t-954dadfb9f4088fe231a929bce9ade97e261098f6cf77f177ac1a111855953923</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Anisotropy</topic><topic>Crystals</topic><topic>Earth</topic><topic>Earth core</topic><topic>Earth's inner core</topic><topic>elastic properties</topic><topic>high pressure</topic><topic>Iron</topic><topic>Phases</topic><topic>Seismic engineering</topic><topic>Seismic phenomena</topic><topic>seismology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lin, Jung-Fu</creatorcontrib><creatorcontrib>Mao, Zhu</creatorcontrib><creatorcontrib>Yavaş, Hasan</creatorcontrib><creatorcontrib>Zhao, Jiyong</creatorcontrib><creatorcontrib>Dubrovinsky, Leonid</creatorcontrib><collection>CrossRef</collection><collection>Earthquake Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Earth and planetary science letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lin, Jung-Fu</au><au>Mao, Zhu</au><au>Yavaş, Hasan</au><au>Zhao, Jiyong</au><au>Dubrovinsky, Leonid</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Shear wave anisotropy of textured hcp-Fe in the Earth's inner core</atitle><jtitle>Earth and planetary science letters</jtitle><date>2010-10-01</date><risdate>2010</risdate><volume>298</volume><issue>3</issue><spage>361</spage><epage>366</epage><pages>361-366</pages><issn>0012-821X</issn><eissn>1385-013X</eissn><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><abstract>Many seismological studies have confirmed that Vp travels 3–4% faster along the rotation axis of the Earth than along the equatorial plane in the inner core, indicating that the inner core is elastically anisotropic. However, seismic and mineral physics observations of the polarized Vs are still emerging. Thus far, the Vs anisotropy of the constitute iron crystals at relevant pressures of the Earth's core has remained mostly theoretical mainly because of the technical difficulties involved in measuring reliable Vs velocities of iron crystals. Here we have measured azimuthal Vs anisotropy of highly textured hcp-Fe at high pressures using nuclear resonant inelastic X-ray scattering, a technique sensitive to Vs, in a diamond anvil cell. Our results show that the azimuthal Vs is 2–4% faster along the crystallographic
c axis than along the
a axis at 158
GPa and 172
GPa. If one describes the Vp anisotropy of the inner core as a result of the textured hcp-Fe crystals, it is conceivable that azimuthal and polarized Vs anisotropies with a magnitude of a few percent also exist in the region. Since Vp and Vs of candidate iron phases behave quite differently in theoretical predictions, our results here indicate that future seismic observations of the Vs and Vp anisotropies of the inner core thus hold the key to deciphering the causes for the seismic and dynamic signatures as well as constitute iron phase(s) of the region.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.epsl.2010.08.006</doi><tpages>6</tpages></addata></record> |
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| ispartof | Earth and planetary science letters, 2010-10, Vol.298 (3), p.361-366 |
| issn | 0012-821X 1385-013X |
| language | eng |
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| source | ScienceDirect Freedom Collection |
| subjects | Anisotropy Crystals Earth Earth core Earth's inner core elastic properties high pressure Iron Phases Seismic engineering Seismic phenomena seismology |
| title | Shear wave anisotropy of textured hcp-Fe in the Earth's inner core |
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