{"id":718,"date":"2012-03-27T12:48:00","date_gmt":"2012-03-27T10:48:00","guid":{"rendered":"https:\/\/kids.esa.int\/keeping_an_eye_from_the_sky_on_volcanoes\/"},"modified":"2026-10-08T00:31:30","modified_gmt":"2026-10-07T22:31:30","slug":"keeping_an_eye_from_the_sky_on_volcanoes","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/keeping_an_eye_from_the_sky_on_volcanoes\/","title":{"rendered":"Att h\u00e5lla ett \u00f6ga p\u00e5 vulkaner \u2013 fr\u00e5n luften"},"content":{"rendered":"
\n

Utbrottet av vulkanen Eyjafjallaj\u00f6kull p\u00e5 Island \u00e5r 2010 visade oss att vulkanutbrott kan f\u00e5 allvarliga konsekvenser som drabbar tusentals m\u00e4nniskor. D\u00e4rf\u00f6r \u00e4r satelliter som \u00f6vervakar vulkaner oerh\u00f6rt viktiga.<\/p>\n<\/div>\n

Tyv\u00e4rr \u00f6vervakas de flesta vulkaner runt om i v\u00e4rlden inte s\u00e4rskilt v\u00e4l, om de \u00f6verhuvudtaget \u00f6vervakas! En studie i tidskriften Science visade att av 440 aktiva vulkaner i v\u00e4rlden har 384 endast mycket grundl\u00e4ggande \u00f6vervakning eller ingen \u00f6vervakning alls. Av dessa vulkaner identifierades 65 som allvarliga risker f\u00f6r stora befolkningsgrupper.<\/p>\n

\"Alutu
Vulkanen Alutu<\/figcaption><\/figure>\n

Jordobservationssatelliter, s\u00e5som ESA:s Envisat, kan med hj\u00e4lp av interferometrisk syntetisk aperturradar (InSAR) uppt\u00e4cka f\u00f6r\u00e4ndringar p\u00e5 vulkaner som inte \u00f6vervakas. InSAR \u00e4r en fj\u00e4rranalysmetod som tar tv\u00e5 eller flera radarbilder \u00f6ver samma omr\u00e5de och kombinerar dem. P\u00e5 s\u00e5 s\u00e4tt kan vi se om n\u00e5gra f\u00f6r\u00e4ndringar i ytan har skett mellan den tidpunkt d\u00e5 den f\u00f6rsta och den andra bilden togs. Dessa f\u00f6r\u00e4ndringar syns som regnb\u00e5gsf\u00e4rgade m\u00f6nster p\u00e5 den nya sammansatta bilden.<\/p>\n

Tack vare dessa satellitobservationer vet man nu att m\u00e5nga vulkaner som man tidigare trodde var vilande visar tecken p\u00e5 aktivitet.<\/p>\n

De nya Sentinel-satelliterna f\u00f6rv\u00e4ntas samla in data \u00f6ver alla landmassor, inklusive vulkaner, var sj\u00e4tte dag under de kommande 20 \u00e5ren. Den f\u00f6rsta av dessa satelliter kommer att skjutas upp n\u00e4sta \u00e5r, 2013. Detta kommer att underl\u00e4tta \u00f6vervakningen av m\u00e5nga av v\u00e4rldens vulkaner.<\/p>\n

Med hj\u00e4lp av satelliter f\u00f6rs\u00f6ker forskarna ta reda p\u00e5 n\u00e4r vulkanisk aktivitet kommer att leda till utbrott. Satellitdata kan ocks\u00e5 hj\u00e4lpa l\u00e4nder att utarbeta evakueringsplaner f\u00f6r m\u00e4nniskor som bor i n\u00e4rheten av vulkaner och vars liv kan vara i fara.<\/p>","protected":false},"excerpt":{"rendered":"

The eruption of the Eyjafjallaj\u00f6kull volcano in Iceland in 2010 showed us that volcanic eruptions can have major consequences, affecting thousands of people. That is why satellites that keep an […]<\/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\/2011\/06\/puzzle_-_volcanoes2\/17895497-2-eng-GB\/Puzzle_-_Volcanoes.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2011\/06\/Puzzle_-_Volcanoes2","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-718","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\/sv\/wp-json\/wp\/v2\/posts\/718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=718"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/718\/revisions"}],"predecessor-version":[{"id":4646,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/718\/revisions\/4646"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=718"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=718"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=718"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=718"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=718"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=718"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=718"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}