{"id":1026,"date":"2007-05-17T11:16:00","date_gmt":"2007-05-17T09:16:00","guid":{"rendered":"https:\/\/kids.esa.int\/monster_waves_tracked_from_space\/"},"modified":"2026-10-08T00:35:02","modified_gmt":"2026-10-07T22:35:02","slug":"monster_waves_tracked_from_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/monster_waves_tracked_from_space\/","title":{"rendered":"Avaruudesta seurattuja j\u00e4ttil\u00e4isaaltoja"},"content":{"rendered":"<div class=\"lede\">\n<p>Intian valtamerell\u00e4 sijaitseva R\u00e9unionin saari on kaikkien mielikuvissa trooppinen paratiisi. 12. toukokuuta 2007 t\u00e4t\u00e4 kaunista matkailukohdetta kuitenkin koettelivat jopa 11 metri\u00e4 korkeat aallot. Rantaan iskeytyv\u00e4t aallot aiheuttivat kaaosta ja tuhoa: kaksi kalastajaa katosi, useita laitureita romahti ja asuntoja sek\u00e4 hotelleja tulvi.<\/p>\n<\/div>\n<p>T\u00e4h\u00e4n tuhoon johtaneet tapahtumat on tallennettu ESA:n Envisat-satelliitin mukana olevalla tutkalaitteella. Laite l\u00e4hett\u00e4\u00e4 radiosignaaleja merenpinnasta ja vastaanottaa niiden kaikuja. N\u00e4iden kaikujen avulla tutkijat voivat m\u00e4\u00e4ritt\u00e4\u00e4 aaltojen koon, korkeuden ja nopeuden. R\u00e9unionin tulvien tapauksessa Envisat osoitti, ett\u00e4 aallot olivat per\u00e4isin suuresta myrskyst\u00e4 Etel\u00e4-Atlantilla. Seuraavien kolmen p\u00e4iv\u00e4n aikana ne levisiv\u00e4t pois myrskyn keskuksesta. Jotkut aallot kulkivat koilliseen l\u00e4hes 4 000 km ennen kuin ne iskeytyiv\u00e4t R\u00e9unioniin.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"3508\" data-credit=\"ECMWF, NASA Quikscat\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/05\/Observation_of_the_storm_winds2\" 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\/2007\/05\/observation_of_the_storm_winds2\/17878182-2-eng-GB\/Observation_of_the_storm_winds.jpg\" alt=\"Observation of the storm winds\"><figcaption>Myrskytuulien havainnointi<\/figcaption><\/figure>\n<p>Vaikka ennusteiden mukaan aallot olisivat iskeneet saareen, niiden korkeuden odotettiin yleisesti olevan vain pari metri\u00e4. Envisat-tietojen analysointi osoittaa kuitenkin, ett\u00e4 aallot olivat noin 5 metri\u00e4 korkeita ja avomerell\u00e4 toisistaan kaukana. Aaltojen v\u00e4linen pitk\u00e4 et\u00e4isyys on merkki siit\u00e4, ett\u00e4 ne johtuivat myrskytuulista. Rannikolle l\u00e4hestyess\u00e4\u00e4n aallot hidastuivat ja niiden korkeus kaksinkertaistui.<\/p>\n<p>\u201cAallokko on edelleen yll\u00e4tt\u00e4v\u00e4 tekij\u00e4, joka voi valitettavasti olla hengenvaarallinen\u201d, sanoi Bertrand Chapron ranskalaisesta merentutkimuslaitoksesta IFREMERist\u00e4. \u201cL\u00e4hitulevaisuudessa aiomme hy\u00f6dynt\u00e4\u00e4 SAR-tutkan (avaruustutka) aaltotietoja ennustaaksemme aallokon saapumisajan ja voimakkuuden.\u201d<\/p>","protected":false},"excerpt":{"rendered":"<p>Reunion Island in the Indian Ocean is everyone\u2019s idea of a tropical paradise. However, on 12 May 2007, the beautiful tourist spot was lashed by waves up to 11 metres [&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\/2007\/05\/swell_propagating_across_the_indian_ocean2\/17884879-2-eng-GB\/Swell_propagating_across_the_Indian_Ocean.gif","esa_banner_description":"Swell propagating across the Indian Ocean","esa_banner_credit":"IFREMER - BOOST Technologies","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/05\/Swell_propagating_across_the_Indian_Ocean2","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-1026","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\/fi\/wp-json\/wp\/v2\/posts\/1026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=1026"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1026\/revisions"}],"predecessor-version":[{"id":4803,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1026\/revisions\/4803"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1026"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1026"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1026"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1026"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1026"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1026"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1026"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}