{"id":554,"date":"2013-12-06T10:12:00","date_gmt":"2013-12-06T09:12:00","guid":{"rendered":"https:\/\/kids.esa.int\/huge_earthquake_changed_earth_s_gravity\/"},"modified":"2026-10-08T00:29:34","modified_gmt":"2026-10-07T22:29:34","slug":"huge_earthquake_changed_earth_s_gravity","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/huge_earthquake_changed_earth_s_gravity\/","title":{"rendered":"Et k\u00e6mpe jordsk\u00e6lv \u00e6ndrede Jordens tyngdekraft"},"content":{"rendered":"<div class=\"lede\">\n<p>Selvom ESA\u2019s GOCE-satellit br\u00e6ndte op under genindtr\u00e6ngningen i Jordens atmosf\u00e6re for et par uger siden, byder denne unikke mission fortsat p\u00e5 overraskelser. Den seneste uventede opdagelse er, at GOCE har registreret en markant \u00e6ndring i den lokale tyngdekraft efter det voldsomme jordsk\u00e6lv, der ramte Japan i 2011.<\/p>\n<\/div>\n<p>GOCE, der har form som en pilespids, blev specielt udviklet til at udarbejde det hidtil mest detaljerede og n\u00f8jagtige kort over variationerne i Jordens tyngdefelt. Mens den fl\u00f8j i en n\u00e6sten pol\u00e6r bane, blev den str\u00f8mlinede satellits bane \u00e6ndret en smule af \u00e6ndringer i Jordens tyngdekraft.<\/p>\n<p>En omhyggelig analyse af de data, som GOCE har sendt tilbage i l\u00f8bet af sin fire\u00e5rige mission, har gjort det muligt for forskerne at udarbejde en bem\u00e6rkelsesv\u00e6rdig pr\u00e6cis model (kendt som \u2018geoiden\u2019) af Jordens tyngdekraft. Gradiometerets bem\u00e6rkelsesv\u00e6rdige f\u00f8lsomhed gjorde det imidlertid ogs\u00e5 muligt at unders\u00f8ge andre forhold p\u00e5 vores planet, s\u00e5som havstr\u00f8mme, \u00e6ndringer i havniveauet, landoverfladens h\u00f8jde og lagene i Jordens bjergartsskorpe. Det registrerede endda vinde i rummet og lydb\u00f8lger, der bev\u00e6gede sig op gennem atmosf\u00e6ren efter det enorme jordsk\u00e6lv i Japan den 11. marts 2011.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"4446\" data-credit=\"DGFI\/TU Delft\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2013\/12\/Gravity_scar_over_Japan2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2013\/12\/gravity_scar_over_japan2\/17911676-2-eng-GB\/Gravity_scar_over_Japan.jpg\" alt=\"Gravity scar over Japan\"><figcaption>Tyngdekraftsarr over Japan<\/figcaption><\/figure>\n<p>Nu har GOCE endnu en gang overrasket alle ved at registrere \u00e6ndringer i det lokale tyngdefelt efter det samme jordsk\u00e6lv p\u00e5 styrke 9, der \u00f8delagde store dele af Japan. Tyske og hollandske forskere har analyseret GOCE-resultaterne og opdaget, at jordsk\u00e6lvet tydeligt har \u00e6ndret tyngdekraften p\u00e5 \u00f8en Honshu og den n\u00e6rliggende havbund. Det er f\u00f8rste gang, at GOCE-data har afsl\u00f8ret \u00e6ndringer over tid.<\/p>\n<p>Desuden adskiller st\u00f8rrelsen og placeringen af de tyngdekrafts\u00e6ndringer, som GOCE har m\u00e5lt, sig fra forudsigelserne. Ved at kombinere GOCE-data med oplysninger fra den tysk-amerikanske GRACE-mission og andre kilder vil forskerne f\u00e5 et langt mere pr\u00e6cist billede af, hvad der skete under undervandsjordsk\u00e6lvet.<\/p>","protected":false},"excerpt":{"rendered":"<p>Although ESA\u2019s GOCE satellite burned up during re-entry into Earth\u2019s atmosphere a few weeks ago, this unique mission keeps on springing surprises. The latest unexpected discovery is that GOCE detected [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2013\/12\/goce\/17888098-2-eng-GB\/GOCE.jpg","esa_banner_description":"GOCE","esa_banner_credit":"ESA \/AOES Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2013\/12\/GOCE","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[42,10,59],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-554","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-natural-disasters"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=554"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/554\/revisions"}],"predecessor-version":[{"id":4546,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/554\/revisions\/4546"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=554"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=554"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=554"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=554"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=554"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=554"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=554"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}