{"id":9336,"date":"2024-08-30T19:47:45","date_gmt":"2024-08-30T23:47:45","guid":{"rendered":"https:\/\/spaceandplanetarynewswire.com\/?p=9336"},"modified":"2024-08-30T19:47:45","modified_gmt":"2024-08-30T23:47:45","slug":"doughnut-shaped-region-found-inside-earths-core-deepens-understanding-of-planets-magnetic-field","status":"publish","type":"post","link":"https:\/\/spaceandplanetarynewswire.com\/?p=9336","title":{"rendered":"Doughnut-Shaped Region Found Inside Earth\u2019s Core Deepens Understanding of Planet\u2019s Magnetic Field"},"content":{"rendered":"
ANU geophysicist Professor Hrvoje Tkal\u010di\u0107 says that the dynamics of Earth’s magnetic field is an area of strong interest in the scientific community.<\/figcaption><\/figure>\n

A doughnut-shaped region thousands of kilometres beneath our feet within Earth\u2019s liquid core has been discovered by scientists from The Australian National University (ANU), providing new clues about the dynamics of our planet\u2019s magnetic field.<\/p>\n

The structure within Earth\u2019s liquid core is found only at low latitudes and sits parallel to the equator. According to ANU seismologists, it has remained undetected until now.<\/p>\n

The Earth has two core layers: the inner core, a solid layer, and the outer core, a liquid layer. Surrounding the Earth\u2019s core is the mantle. The newly discovered doughnut-shaped region is at the top of Earth\u2019s outer core, where the liquid core meets the mantle.<\/p>\n

Study<\/a> co-author and ANU geophysicist, Professor Hrvoje Tkal\u010di\u0107, said the seismic waves detected are slower in the newly discovered region than in the rest of the liquid outer core.<\/p>\n

\u201cThe region sits parallel to the equatorial plane, is confined to the low latitudes and has a doughnut shape,\u201d he said.
\n 
\n\u201cWe don\u2019t know the exact thickness of the doughnut, but we inferred that it reaches a few hundred kilometres beneath the core-mantle boundary.\u201d
\n 
\nRather than using traditional seismic wave observation techniques and observing signals generated by earthquakes within the first hour, the ANU scientists analysed the similarities between waveforms many hours after the earthquake origin times, leading them to make the unique discovery.
\n 
\n\u201cBy understanding the geometry of the paths of the waves and how they traverse the outer core\u2019s volume, we reconstructed their travel times through the Earth, demonstrating that the newly discovered region has low seismic speeds,\u201d Professor Tkal\u010di\u0107 said.
\n 
\n\u201cThe peculiar structure remained hidden until now as previous studies collected data with less volumetric coverage of the outer core by observing waves that were typically confined within one hour after the origin times of large earthquakes.
\n 
\n\u201cWe were able to achieve much better volumetric coverage because we studied the reverberating waves for many hours after large earthquakes.\u201d<\/p>\n

Study co-author, Dr Xiaolong Ma, said that the discovery uncovers some mysteries of the dynamics of Earth\u2019s magnetic field.
\n 
\n\u201cThere are still mysteries about the Earth’s outer core that are yet to be solved, which requires multidisciplinary efforts from seismology, mineral physics, geomagnetism and geodynamics,\u201d Dr Ma said.
\n 
\nThe outer core is predominantly made of liquid iron and nickel, and the vigorous movement of the electrically conductive liquid creates Earth\u2019s magnetic field, which shields around Earth and helps to sustain all life, protecting it from damaging solar winds and harmful radiation.
\n 
\nThe scientists believe that knowing more about the Earth\u2019s outer core\u2019s composition, including light chemical elements, is fundamental to understanding the magnetic field and predicting when it could potentially cease or weaken.
\n 
\n\u201cOur findings are interesting because this low velocity within the liquid core implies that we have a high concentration of light chemical elements in these regions that would cause the seismic waves to slow down. These light elements, alongside temperature differences, help stir liquid in the outer core,\u201d Professor Tkal\u010di\u0107 said.
\n 
\n\u201cThe magnetic field is a fundamental ingredient that we need for life to be sustained on the surface of our planet.
\n 
\n\u201cThe dynamics of Earth\u2019s magnetic field is an area of strong interest in the scientific community, so our results could promote more research about the magnetic field on both Earth and other planets.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

A doughnut-shaped region thousands of kilometres beneath our feet within Earth\u2019s liquid core has been discovered by scientists from The Australian National University (ANU), providing new clues about the dynamics of our planet\u2019s magnetic field. The structure within Earth\u2019s liquid core is found only at low latitudes and sits parallel to the equator. According to…<\/p>\n","protected":false},"author":71,"featured_media":9337,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"fifu_image_url":"https:\/\/earimediaprodweb.azurewebsites.net\/Api\/v1\/Multimedia\/84efc990-d40f-49a5-9111-7c872a5d1ae9\/Rendition\/low-res\/Content\/Public","fifu_image_alt":"","footnotes":""},"categories":[216],"tags":[],"class_list":["post-9336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-discovery"],"_links":{"self":[{"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/posts\/9336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/users\/71"}],"replies":[{"embeddable":true,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9336"}],"version-history":[{"count":1,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/posts\/9336\/revisions"}],"predecessor-version":[{"id":9338,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/posts\/9336\/revisions\/9338"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=\/wp\/v2\/media\/9337"}],"wp:attachment":[{"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spaceandplanetarynewswire.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}