{"id":100053,"date":"2025-09-25T07:30:20","date_gmt":"2025-09-25T04:30:20","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=100053"},"modified":"2025-09-25T00:17:50","modified_gmt":"2025-09-24T21:17:50","slug":"un-eveniment-ascuns-din-2007-a-zguduit-gravitatia-si-campul-magnetic-al-pamantului","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/un-eveniment-ascuns-din-2007-a-zguduit-gravitatia-si-campul-magnetic-al-pamantului\/","title":{"rendered":"Un eveniment ascuns din 2007 a zguduit gravita\u021bia \u0219i c\u00e2mpul magnetic al P\u0103m\u00e2ntului"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/09\/eveniment-ascuns-Pamant.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-100054\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/09\/eveniment-ascuns-Pamant.jpg\" alt=\"\" width=\"356\" height=\"211\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/09\/eveniment-ascuns-Pamant.jpg 356w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/09\/eveniment-ascuns-Pamant-300x178.jpg 300w\" sizes=\"auto, (max-width: 356px) 100vw, 356px\" \/><\/a>La \u00eenceputul anului 2007, s-a \u00eent\u00e2mplat ceva \u00een ad\u00e2ncul P\u0103m\u00e2ntului, detectat de sateli\u021bi, dar pe care nimeni nu l-a observat la momentul respectiv. Orbit\u00e2nd la sute de kilometri deasupra suprafe\u021bei, sateli\u0163ii gemeni <strong>GRACE<\/strong> (<strong>The Gravity Recovery and Climate Experiment<\/strong>) au \u00eenregistrat un semnal gravita\u021bional cum nu s-a mai \u00eent\u00e2mplat \u00een cei 15 ani de func\u021bionare (2002-2017). Semnalul a fost vast, puternic \u0219i a ap\u0103rut aproape peste noapte. A atins intensitatea maxim\u0103 \u00een ianuarie 2007, \u00eentinz\u00e2ndu-se pe \u0219apte mii de kilometri de grani\u021ba atlantic\u0103 \u00een largul coastei Africii, apoi s-a stins \u00een decurs de 2 ani. Doar o reanalizare ulterioar\u0103 l-a dezv\u0103luit \u0219i abia atunci geofizicienii au \u00eenceput s\u0103 \u00een\u021beleag\u0103 ce \u00eenseamn\u0103. Ceea ce au descoperit nu indica inunda\u021bii, furtuni sau maree, ci o transformare mineral\u0103 la aproape 3.000 de kilometri sub suprafa\u021b\u0103, \u00een punctul de contact dintre mantaua solid\u0103 \u0219i miezul exterior topit.<\/p>\n<p>Sateli\u021bii GRACE au fost construi\u021bi cu un scop complet diferit. Ace\u0219tia au fost concepu\u021bi pentru a urm\u0103ri mi\u0219carea masei pe suprafa\u021ba P\u0103m\u00e2ntului, \u00een special a apei \u0219i a ghe\u021bii. Zbur\u00e2nd \u00een tandem, unul dup\u0103 altul, ace\u0219tia m\u0103surau constant micile schimb\u0103ri de distan\u021b\u0103 dintre ei pe m\u0103sur\u0103 ce \u00eent\u00e2lneau c\u00e2mpuri gravita\u021bionale mai puternice sau mai slabe dedesubt. Sistemul a fost suficient de sensibil pentru a dezv\u0103lui retragerea ghe\u021bii din Groenlanda \u0219i ridicarea oceanelor din cauza topirii ghe\u021barilor. Dar \u00een ianuarie 2007, deasupra Atlanticului de est, a \u00eenregistrat ceva mult mai neobi\u0219nuit.<\/p>\n<p>Anomalia nu a fost subtil\u0103. A fost cel mai intens semnal \u00eenregistrat \u00een acea regiune pe parcursul \u00eentregii misiuni GRACE, mult peste zgomotul statistic care de obicei ascunde micile varia\u021bii. \u00cen plus, \u00een loc s\u0103 se \u00eentind\u0103 pe c\u00e2teva sute sau mii de kilometri, se extindea pe o zon\u0103 de mii de kilometri l\u0103\u021bime. Era aliniat\u0103 de la nord la sud, travers\u00e2nd grani\u021ba continent-ocean dintre Africa \u0219i Atlantic. \u0218i nu a durat decenii, ci doar c\u00e2\u021biva ani, cresc\u00e2nd \u00een 2006, ating\u00e2nd v\u00e2rful \u00een 2007 \u0219i disip\u00e2ndu-se p\u00e2n\u0103 \u00een 2008.<\/p>\n<p>C\u00e2nd cercet\u0103torii au \u00eent\u00e2lnit pentru prima dat\u0103 anomalia din datele reprocesate, au testat explica\u021biile evidente. Ar putea fi vorba de ap\u0103? Inunda\u021biile, precipita\u021biile sau hidrologia sezonier\u0103 creeaz\u0103 adesea schimb\u0103ri de mas\u0103 suficient de mari pentru a fi detectate de sateli\u021bi. Au fost consultate cinci modele hidrologice independente. Niciunul nu a produs nimic care s\u0103 semene c\u00e2t de c\u00e2t cu anomalia din 2007. Apoi, echipa a analizat oceanele. Ar fi putut o schimbare a nivelului m\u0103rii, determinat\u0103 de curen\u021bi sau de expansiunea termic\u0103, s\u0103 creeze anomalia? Din nou, modelele \u0219i observa\u021biile nu au corespuns. Simul\u0103rile oceanice nu au ar\u0103tat nimic neobi\u0219nuit \u00een Atlanticul de Est \u00een perioada 2006-2008.<\/p>\n<p>Anomalia a ie\u0219it \u00een eviden\u021b\u0103 \u0219i datorit\u0103 momentului \u00een care a avut loc. A coincis cu una dintre cele mai puternice varia\u0163ii geomagnetice \u00eenregistrate vreodat\u0103, o schimbare brusc\u0103 a c\u00e2mpului magnetic al P\u0103m\u00e2ntului detectat\u0103 \u00een 2007. Aceste evenimente i-au nedumerit pe oamenii de \u0219tiin\u021b\u0103 timp de decenii. Se \u00eent\u00e2mpl\u0103 neregulat, adesea la aproximativ un deceniu distan\u021b\u0103, \u0219i sugereaz\u0103 schimb\u0103ri rapide \u00een fluxul nucleului exterior. Varia\u0163ia din 2007 a fost una dintre cele mai intense observate \u00een timpurile moderne. Faptul c\u0103 anomalia gravita\u021bional\u0103 \u0219i perturba\u021bia geomagnetic\u0103 s-au produs simultan, \u00een acela\u0219i sector geografic, a indicat o cauz\u0103 comun\u0103.<\/p>\n<p>Aten\u021bia s-a \u00eendreptat c\u0103tre grani\u021ba dintre manta \u0219i miez, o regiune cunoscut\u0103 sub numele de <strong>stratul D<\/strong>. Aceast\u0103 zon\u0103 se afl\u0103 la o ad\u00e2ncime de aproximativ 2.900 de kilometri, unde presiunile dep\u0103\u0219esc 130 de gigapascali, iar temperaturile cresc peste 2.500 de grade Celsius. Este una dintre cele mai pu\u021bin \u00een\u021belese p\u0103r\u021bi ale planetei. Studiile seismice au ar\u0103tat c\u0103 este eterogen\u0103, cu regiuni cu viteze seismice neobi\u0219nuit de mici, zone cu vitez\u0103 ultra-redus\u0103 \u0219i indicii de complexitate stratificat\u0103. Unul dintre cele mai importante procese suspectate \u00een aceast\u0103 regiune este tranzi\u021bia de faz\u0103 a <em>bridgmanitului<\/em>, mineralul dominant al mantalei inferioare. Sub presiune \u0219i temperatur\u0103 extreme, bridgmanitul se poate transforma \u00eentr-o form\u0103 mai dens\u0103 numit\u0103 <em>post-perovskit<\/em>.<\/p>\n<p>Aceast\u0103 transformare este brusc\u0103. Experimentele de laborator arat\u0103 c\u0103, odat\u0103 ce condi\u021biile sunt \u00eendeplinite, structura mineral\u0103 se rearanjeaz\u0103 rapid. Diferen\u021ba de densitate dintre cele dou\u0103 faze este semnificativ\u0103, de ordinul a o sut\u0103 de kilograme pe metru cub. Dac\u0103 o regiune lat\u0103 de sute sau mii de kilometri sufer\u0103 o astfel de transformare, schimbarea distribu\u021biei masei este suficient de mare pentru a afecta c\u00e2mpul gravita\u021bional detectabil la suprafa\u021b\u0103. Tranzi\u021bia este, de asemenea, foarte sensibil\u0103 la temperatur\u0103. Materialul mai fierbinte se transform\u0103 la ad\u00e2ncime, materialul mai rece la suprafa\u0163\u0103.<\/p>\n<p>Modelarea realizat\u0103 de echipa de cercetare a sugerat c\u0103 dou\u0103 regiuni reci, fiecare cu o l\u0103\u021bime de aproximativ o mie de kilometri, care trec prin tranzi\u021bia de la perovskit la post-perovskit ar putea explica anomalia din 2007. Apari\u021bia \u0219i descre\u0219terea rapid\u0103 a anomaliei ar putea fi explicat\u0103 prin cre\u0219terea regiunilor transformate pe parcursul a aproximativ 18 luni, urmat\u0103 de relaxarea \u00een stratul D \u00eenconjur\u0103tor.<\/p>\n<p>Anomalia din 2007 a dezv\u0103luit c\u0103 aceste procese nu sunt doar reale, ci \u0219i rapide. \u00cen loc de milioane de ani, transformarea s-a desf\u0103\u0219urat \u00een mai pu\u021bin de doi ani. Aceasta este o situa\u021bie aproape instantanee pe scara timpului geologic. Aceasta \u00eenseamn\u0103 c\u0103 interiorul profund al P\u0103m\u00e2ntului este capabil de schimb\u0103ri bru\u0219te \u0219i puternice, care pot fi m\u0103surate la suprafa\u021b\u0103.<\/p>\n<p>O astfel de leg\u0103tur\u0103 \u00eentre procesele mantalei \u0219i varia\u021biile geomagnetice a fost suspectat\u0103 de mult timp, dar rareori observat\u0103. Anomalia din 2007 ofer\u0103 prima dovad\u0103 puternic\u0103. Implica\u021bia este c\u0103 c\u00e2mpul magnetic al P\u0103m\u00e2ntului este sensibil nu doar la miezul \u00een sine, ci \u0219i la dinamica mantalei suprapuse.<\/p>\n<p>Magnitudinea evenimentului ridic\u0103, de asemenea, \u00eentreb\u0103ri cu privire la frecven\u021b\u0103. A fost 2007 un eveniment rar sau transform\u0103ri similare se \u00eent\u00e2mpl\u0103 mai des dec\u00e2t ne d\u0103m seama?<\/p>\n<p>\u00cen 2007, planeta noastr\u0103 s-a schimbat din interior. \u00cenregistr\u0103rile acestei schimb\u0103ri au r\u0103mas ascunse p\u00e2n\u0103 c\u00e2nd cercet\u0103torii au scos-o la lumin\u0103. Ceea ce au descoperit a fost o privire asupra unei lumi aflate la aproape 3.000 de kilometri ad\u00e2ncime, unde mineralele \u00ee\u0219i schimb\u0103 forma, unde mantaua atinge miezul \u0219i unde procese nev\u0103zute modeleaz\u0103 soarta c\u00e2mpului magnetic de deasupra. Anomalia a durat doar pu\u021bin timp, dar mo\u0219tenirea sa este o amintire permanent\u0103 c\u0103 ad\u00e2ncurile P\u0103m\u00e2ntului nu sunt inerte. Este viu, nelini\u0219tit \u0219i capabil de schimb\u0103ri bru\u0219te.<\/p>\n<p><strong>Sursa:<\/strong> studiul \u015ftiin\u0163ific <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2025GL116408\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;GRACE Detection of Transient Mass Redistributions During a Mineral Phase Transition in the Deep Mantle&#8221; \/ agupubs.onlinelibrary.wiley.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La \u00eenceputul anului 2007, s-a \u00eent\u00e2mplat ceva \u00een ad\u00e2ncul P\u0103m\u00e2ntului, detectat de sateli\u021bi, dar pe care nimeni nu l-a observat la momentul respectiv. Orbit\u00e2nd la sute de kilometri deasupra suprafe\u021bei, sateli\u0163ii gemeni GRACE (The Gravity Recovery and Climate Experiment) au &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Un eveniment ascuns din 2007 a zguduit gravita\u021bia \u0219i c\u00e2mpul magnetic al P\u0103m\u00e2ntului\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/un-eveniment-ascuns-din-2007-a-zguduit-gravitatia-si-campul-magnetic-al-pamantului\/#more-100053\" aria-label=\"Cite\u0219te mai multe despre Un eveniment ascuns din 2007 a zguduit gravita\u021bia \u0219i c\u00e2mpul magnetic al P\u0103m\u00e2ntului\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":100054,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1770],"tags":[235,14548,20243,1662,7998,9807,1578,20241,1367,3737,4927,3842,10714,13705,1604,1132,105,814,20242,2358],"class_list":["post-100053","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geografie-feologie","tag-africa","tag-anomalie","tag-bridgmanit","tag-camp-magnetic","tag-geofizician","tag-geografie-geologie","tag-gheata","tag-grace","tag-gravitatie","tag-groenlanda","tag-manta","tag-maree","tag-miez","tag-mineral","tag-ocean","tag-oceanul-atlantic","tag-pamant","tag-sateliti","tag-stratul-d","tag-temperatura","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Un eveniment ascuns din 2007 a zguduit gravita\u021bia \u0219i c\u00e2mpul magnetic al P\u0103m\u00e2ntului - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/un-eveniment-ascuns-din-2007-a-zguduit-gravitatia-si-campul-magnetic-al-pamantului\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un eveniment ascuns din 2007 a zguduit gravita\u021bia \u0219i c\u00e2mpul magnetic al P\u0103m\u00e2ntului\" \/>\n<meta property=\"og:description\" content=\"La \u00eenceputul anului 2007, s-a \u00eent\u00e2mplat ceva \u00een ad\u00e2ncul P\u0103m\u00e2ntului, detectat de sateli\u021bi, dar pe care nimeni nu l-a observat la momentul respectiv. 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