{"id":4635,"date":"2023-08-24T17:56:14","date_gmt":"2023-08-24T17:56:14","guid":{"rendered":"https:\/\/dailyai.com\/?p=4635"},"modified":"2023-08-24T19:25:08","modified_gmt":"2023-08-24T19:25:08","slug":"researchers-harness-satellite-data-to-create-accurate-tsunami-warning-system","status":"publish","type":"post","link":"https:\/\/dailyai.com\/sv\/2023\/08\/researchers-harness-satellite-data-to-create-accurate-tsunami-warning-system\/","title":{"rendered":"Forskare utnyttjar satellitdata f\u00f6r att skapa ett exakt tsunamivarningssystem"},"content":{"rendered":"<p><b>Forskare anv\u00e4nde AI f\u00f6r att identifiera f\u00f6r\u00e4ndringar i jordens atmosf\u00e4r som genereras n\u00e4r tsunamiv\u00e5gor b\u00f6rjar bildas till havs.\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Detta kan avsev\u00e4rt f\u00f6rl\u00e4nga varningstiden f\u00f6r kustsamh\u00e4llen som riskerar att drabbas av tsunamis.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Valentino Constantinou fr\u00e5n Florida-baserade Terran Orbital Corporation f\u00f6rklarar: \"Det finns inget globalt n\u00e4tverk f\u00f6r att uppt\u00e4cka tsunamiv\u00e5gor och det \u00e4r dyrt att installera fysisk h\u00e5rdvara, som bojbaserade system. Men vi vet att sm\u00e5 satellitkonstellationer sprider sig \u00f6verallt.\"<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hastigheten p\u00e5 signalerna fr\u00e5n jordb\u00e4vningar till havs p\u00e5verkas av t\u00e4theten av laddade partiklar i jordens jonosf\u00e4r, som befinner sig cirka 300 till 350 kilometer ovanf\u00f6r jordytan. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00e4r en tsunami genererar chockv\u00e5gor som stiger upp i atmosf\u00e4ren, \u00e4ndrar de densiteten hos dessa laddade partiklar, vilket leder till sm\u00e5 men detekterbara f\u00f6r\u00e4ndringar i de signaler som tas emot av satelliter.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.jpl.nasa.gov\/news\/scientists-look-to-skies-to-improve-tsunami-detection\">Tidigare forskning<\/a> som genomf\u00f6rdes av NASA:s Jet Propulsion Laboratory och Sapienza University of Rome i Italien ledde till en ber\u00e4kningsmetod f\u00f6r att m\u00e4ta fluktuationer i laddade partiklars densitet p\u00e5 grund av tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Med utg\u00e5ngspunkt i detta konverterade Constantinou och hans team data, som ursprungligen var i endimensionella format, till tv\u00e5dimensionella bilder. Dessa bilder analyserades sedan av AI-modeller f\u00f6r att hitta tecken relaterade till tsunamis.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Teamet tr\u00e4nade sitt AI-system med hj\u00e4lp av data fr\u00e5n tre specifika jordb\u00e4vningsinducerade tsunamier: tsunamierna i Chile 2010, Japan 2011 och Kanada 2012.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De testade modellens effektivitet p\u00e5 en fj\u00e4rde tsunami som orsakades av jordb\u00e4vningen Illapel i Chile 2015. AI:n granskades f\u00f6r att bed\u00f6ma hur v\u00e4l den kunde skilja tsunami-inducerade f\u00f6r\u00e4ndringar fr\u00e5n standardjonosf\u00e4riskt bakgrundsbrus.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">F\u00f6r att minimera antalet falska positiva signaler filtrerade forskarna bort st\u00f6rningar som orsakades av markstationer som kommunicerade med de ovanliggande satelliterna.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Enligt Quentin Brissaud fr\u00e5n NORSAR, en norsk seismisk forskningsstiftelse som inte \u00e4r kopplad till studien, gav denna metod \"ganska bra resultat\" med en detekteringsnoggrannhet p\u00e5 \u00f6ver 90%. Brissaud p\u00e5pekade dock att det skulle beh\u00f6vas mer data f\u00f6r att fastst\u00e4lla systemets tillf\u00f6rlitlighet f\u00f6r olika typer av tsunamis.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Quentin Brissaud konstaterar att \"det faktum att stora tsunamis \u00e4r s\u00e4llsynta g\u00f6r det sv\u00e5rt att analysera och f\u00f6rutse s\u00e5dana h\u00e4ndelser\".<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En av utmaningarna med att inf\u00f6ra ett globalt tsunamivarningssystem \u00e4r behovet av internationell datadelning. Som Constantinou n\u00e4mner: \"Data innehas ofta av regeringar eller kommersiella partners som driver satelliterna. Det finns ingen plats d\u00e4r man kan h\u00e4mta data f\u00f6r ett globalt system.\"<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Mer om studien<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Detta <\/span><a href=\"https:\/\/arxiv.org\/pdf\/2308.04611.pdf\"><span style=\"font-weight: 400;\">studie<\/span><\/a><span style=\"font-weight: 400;\"> kombinerar satellitdata med maskininl\u00e4rning (ML) f\u00f6r att analysera f\u00f6r\u00e4ndringar i jordens atmosf\u00e4r som utl\u00f6ses av tsunamis.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00c4ven om uppt\u00e4ckten av tsunamier har f\u00f6rb\u00e4ttrats p\u00e5 senare tid, har m\u00e5nga kustlinjer fortfarande otillr\u00e4cklig t\u00e4ckning fr\u00e5n tidiga varningssystem.\u00a0<\/span><\/p>\n<p>S\u00e5 h\u00e4r fungerar det:<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Forskare har utvecklat ett AI-baserat ramverk f\u00f6r att identifiera tidiga tecken p\u00e5 tsunamis genom att \u00f6vervaka TIDs (Traveling Ionospheric Disturbances) i jordens jonosf\u00e4r. Dessa st\u00f6rningar p\u00e5verkar det totala elektroninneh\u00e5llet (TEC), vilket kan uppt\u00e4ckas via det globala satellitnavigeringssystemet (GNSS).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Denna metod utnyttjar data fr\u00e5n flera satellitsystem som GPS, Galileo, GLONASS och BeiDou. Det ger t\u00e4ckning i realtid \u00f6ver \u00f6ppet hav och fungerar som ett v\u00e4rdefullt komplement till geografiska omr\u00e5den som inte n\u00e5s av traditionella bojbaserade varningssystem.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">AI-modellen anv\u00e4nder CNN (Convolutional Neural Networks) som tr\u00e4nats p\u00e5 historiska data fr\u00e5n tsunamierna i Maule 2010, Tohoku 2011 och Haida-Gwaii 2012. Den validerades senare med data fr\u00e5n tsunamin i Illapel 2015 och uppn\u00e5dde en tr\u00e4ffs\u00e4kerhet p\u00e5 91,7%.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Systemet anv\u00e4nder sig av en FPM-strategi (False Positive Mitigation) som avsev\u00e4rt minskar antalet falsklarm.<\/span><\/li>\n<\/ul>\n<p>M\u00e5nga AI-system anv\u00e4nds f\u00f6r att f\u00f6rutse milj\u00f6katastrofer, bland annat <a href=\"https:\/\/dailyai.com\/sv\/2023\/08\/googles-ai-flood-detection-system-predicts-floods-four-days-in-advance\/\">Googles \u00f6versv\u00e4mningshub<\/a>som nyligen utvidgades till att omfatta fler regioner.<\/p>","protected":false},"excerpt":{"rendered":"<p>Forskare anv\u00e4nde AI f\u00f6r att identifiera f\u00f6r\u00e4ndringar i jordens atmosf\u00e4r som genereras n\u00e4r tsunamiv\u00e5gor b\u00f6rjar bildas till havs.  Detta kan avsev\u00e4rt f\u00f6rl\u00e4nga varningstiden f\u00f6r kustsamh\u00e4llen som riskerar att drabbas av tsunamier. Valentino Constantinou fr\u00e5n Florida-baserade Terran Orbital Corporation f\u00f6rklarar: \"Det finns inget globalt n\u00e4tverk f\u00f6r att uppt\u00e4cka tsunamiv\u00e5gor och det \u00e4r dyrt att installera fysisk h\u00e5rdvara, som bojbaserade system. Men vi vet att sm\u00e5 satellitkonstellationer sprider sig \u00f6verallt.\" Hastigheten p\u00e5 de signaler som produceras av jordb\u00e4vningar till havs p\u00e5verkas av t\u00e4theten av laddade partiklar i jordens jonosf\u00e4r, som befinner sig cirka 300 till 350 kilometer ovanf\u00f6r ytan.<\/p>","protected":false},"author":2,"featured_media":4636,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[337,105],"class_list":["post-4635","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-climate-science","tag-machine-learning"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Researchers harness satellite data to create accurate tsunami warning system | DailyAI<\/title>\n<meta name=\"description\" content=\"Researchers have proven that AI can 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