{"id":668891,"date":"2025-12-30T07:06:05","date_gmt":"2025-12-30T07:06:05","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=668891"},"modified":"2025-12-30T07:06:05","modified_gmt":"2025-12-30T07:06:05","slug":"descoperire-majora-despre-nucleul-pamantului-ar-putea-fi-stratificat-ca-o-ceapa","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=668891","title":{"rendered":"Descoperire major\u0103 despre nucleul P\u0103m\u00e2ntului. Ar putea fi stratificat ca o ceap\u0103"},"content":{"rendered":"
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Studiul ofer\u0103 o posibil\u0103 explica\u021bie pentru anomaliile observate de-a lungul timpului \u00een modul \u00een care undele seismice traverseaz\u0103 centrul planetei noastre, aflat la peste 5.000 de kilometri sub suprafa\u021b\u0103.<\/p>\n

Cum au fost analizate undele seismice din nucleul intern al P\u0103m\u00e2ntului<\/h2>\n

Cercetarea s-a concentrat pe a\u0219a-numitele anisotropii seismice<\/strong>, adic\u0103 varia\u021biile de vitez\u0103 ale undelor seismice atunci c\u00e2nd acestea se deplaseaz\u0103 prin nucleul intern al P\u0103m\u00e2ntului<\/strong>, \u00een func\u021bie de direc\u021bia de propagare. Aceste diferen\u021be au fost observate de mult timp, \u00eens\u0103 explica\u021biile existente nu erau sus\u021binute de suficiente date experimentale.<\/p>\n

Coordonat\u0103 de mineralogul Carmen Sanchez-Valle de la Universitatea din M\u00fcnster, echipa a analizat modul \u00een care fierul, elementul dominant din nucleul P\u0103m\u00e2ntului, \u00ee\u0219i modific\u0103 structura cristalin\u0103 atunci c\u00e2nd este combinat cu siliciu \u0219i carbon \u2013 elemente considerate \u201eu\u0219oare\u201d \u00een context geologic.<\/p>\n

Experimente extreme<\/h2>\n

Pentru a recrea condi\u021biile din nucleul intern al P\u0103m\u00e2ntului<\/strong>, cercet\u0103torii au supus aliaje de fier, siliciu \u0219i carbon la presiuni foarte ridicate \u0219i temperaturi de p\u00e2n\u0103 la 820 de grade Celsius. Folosind difrac\u021bia cu raze X, ei au analizat orientarea cristalelor \u2013 o proprietate numit\u0103 \u201elattice-preferred orientation\u201d (LPO).<\/p>\n

Rezultatele au ar\u0103tat c\u0103 ad\u0103ugarea siliciului \u0219i carbonului modific\u0103 semnificativ structura cristalin\u0103 a fierului, influen\u021b\u00e2nd modul \u00een care undele seismice sunt transmise prin nucleul intern al P\u0103m\u00e2ntului<\/strong>.<\/p>\n

Ce \u00eenseamn\u0103<\/h2>\n

Conform concluziilor studiului, partea central\u0103 a nucleului intern al P\u0103m\u00e2ntului<\/strong> ar con\u021bine mai pu\u021bin siliciu \u0219i carbon, ceea ce explic\u0103 anisotropia seismic\u0103 puternic\u0103 observat\u0103 acolo.<\/p>\n

Spre exterior, concentra\u021bia acestor elemente cre\u0219te, duc\u00e2nd la o reducere a anisotropiei. Aceast\u0103 distribu\u021bie sugereaz\u0103 o stratificare chimic\u0103<\/strong> ap\u0103rut\u0103 \u00een urma proceselor de cristalizare ale nucleului, scrie Science Alert<\/a>.<\/p>\n

De ce este important\u0103 aceast\u0103 descoperire<\/h2>\n

Studiul reprezint\u0103 un pas important \u00een \u00een\u021belegerea structurii profunde a planetei noastre.<\/p>\n

Prin corelarea datelor seismice cu experimente de laborator, cercet\u0103torii pot reconstrui procesele care au loc \u00een nucleul intern al P\u0103m\u00e2ntului<\/strong>, un domeniu inaccesibil observa\u021biilor directe, dar esen\u021bial pentru dinamica \u0219i evolu\u021bia Terrei.<\/p>\n","protected":false},"excerpt":{"rendered":"

Studiul ofer\u0103 o posibil\u0103 explica\u021bie pentru anomaliile observate de-a lungul timpului \u00een modul \u00een care undele seismice traverseaz\u0103 centrul planetei noastre, aflat la peste 5.000 de kilometri sub suprafa\u021b\u0103. Cum … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":668892,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/668891"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=668891"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/668891\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/668892"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=668891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=668891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=668891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}