{"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\/nb\/2023\/08\/researchers-harness-satellite-data-to-create-accurate-tsunami-warning-system\/","title":{"rendered":"Forskere utnytter satellittdata for \u00e5 skape et n\u00f8yaktig tsunamivarslingssystem"},"content":{"rendered":"<p><b>Forskerne brukte kunstig intelligens til \u00e5 identifisere endringer i jordatmosf\u00e6ren som oppst\u00e5r n\u00e5r tsunamib\u00f8lger begynner \u00e5 danne seg i havet.\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Dette kan forlenge varslingstiden betydelig for kystsamfunn som er utsatt for tsunamirisiko.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Valentino Constantinou fra Terran Orbital Corporation i Florida forklarer: \"Det finnes ikke noe globalt nettverk for \u00e5 oppdage tsunamib\u00f8lger, og det er dyrt \u00e5 installere fysisk maskinvare, som b\u00f8yebaserte systemer. Men vi vet at sm\u00e5 satellittkonstellasjoner bare blir flere og flere overalt.\"<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hastigheten p\u00e5 signalene fra jordskjelv til havs p\u00e5virkes av tettheten av ladede partikler i jordens ionosf\u00e6re, som befinner seg 300 til 350 kilometer over jordoverflaten. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00e5r en tsunami genererer sjokkb\u00f8lger som stiger opp i atmosf\u00e6ren, endrer de tettheten av disse ladede partiklene, noe som f\u00f8rer til sm\u00e5, men p\u00e5viselige endringer i signalene som mottas av satellitter.<\/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\">Tidligere forskning<\/a> utf\u00f8rt av NASAs Jet Propulsion Laboratory og Sapienza-universitetet i Roma i Italia f\u00f8rte til en beregningsmetode for \u00e5 m\u00e5le svingninger i tettheten av ladede partikler som skyldes tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P\u00e5 bakgrunn av dette konverterte Constantinou og teamet hans dataene, som opprinnelig var i endimensjonale formater, til todimensjonale bilder. Disse bildene ble deretter analysert av AI-modeller for \u00e5 finne tegn p\u00e5 tsunamier.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Teamet trente opp AI-systemet sitt ved hjelp av data fra tre spesifikke jordskjelvinduserte tsunamier: tsunamiene i Chile i 2010, Japan i 2011 og Canada i 2012.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De testet modellens effektivitet p\u00e5 en fjerde tsunami for\u00e5rsaket av Illapel-jordskjelvet i Chile i 2015. AI ble unders\u00f8kt for \u00e5 vurdere hvor godt den kunne skille tsunami-induserte endringer fra vanlig ionosf\u00e6risk bakgrunnsst\u00f8y.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For \u00e5 minimere falske positiver filtrerte forskerne bort forstyrrelser for\u00e5rsaket av bakkestasjoner som kommuniserte med de overliggende satellittene.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If\u00f8lge Quentin Brissaud fra NORSAR, en norsk seismisk forskningsstiftelse som ikke er knyttet til studien, ga denne metodikken \"ganske gode resultater\" med en deteksjonsn\u00f8yaktighet p\u00e5 over 90%. Brissaud p\u00e5pekte imidlertid at det ville v\u00e6re behov for mer data for \u00e5 fastsl\u00e5 hvor p\u00e5litelig dette systemet er for ulike typer tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Quentin Brissaud bemerker at \"sjeldenheten av store tsunamier gj\u00f8r det utfordrende \u00e5 analysere og forutsi slike hendelser\".<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En av utfordringene ved \u00e5 ta i bruk et globalt tsunamivarslingssystem er behovet for internasjonal datadeling. Som Constantinou nevner: \"Dataene befinner seg ofte hos regjeringer eller kommersielle partnere som driver satellittene. Det finnes ikke ett sted \u00e5 hente dataene til et globalt system.\"<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Mer om studien<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Dette <\/span><a href=\"https:\/\/arxiv.org\/pdf\/2308.04611.pdf\"><span style=\"font-weight: 400;\">studie<\/span><\/a><span style=\"font-weight: 400;\"> kombinerer satellittdata med maskinl\u00e6ring (ML) for \u00e5 analysere endringer i jordatmosf\u00e6ren som utl\u00f8ses av tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Selv om det er gjort fremskritt i oppdagelsen av tsunamier i det siste, har mange kystlinjer fortsatt utilstrekkelig dekning fra systemer for tidlig varsling.\u00a0<\/span><\/p>\n<p>Slik fungerer det:<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Forskere har utviklet et AI-basert rammeverk for \u00e5 identifisere tidlige tegn p\u00e5 tsunamier ved \u00e5 overv\u00e5ke ionosf\u00e6riske forstyrrelser (TIDs) i jordens ionosf\u00e6re. Disse forstyrrelsene p\u00e5virker det totale elektroninnholdet (TEC), som kan detekteres gjennom det globale satellittnavigasjonssystemet (GNSS).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Denne tiln\u00e6rmingen utnytter data fra flere satellittsystemer som GPS, Galileo, GLONASS og BeiDou. Det gir dekning i sanntid p\u00e5 \u00e5pent hav, og er et verdifullt supplement til geografiske omr\u00e5der som ikke er tilgjengelige for tradisjonelle b\u00f8yebaserte varslingssystemer.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">AI-modellen bruker Convolutional Neural Networks (CNN) som er trent p\u00e5 historiske data fra tsunamiene i Maule i 2010, Tohoku i 2011 og Haida-Gwaii i 2012. Den ble senere validert med data fra Illapel-tsunamien i 2015, og oppn\u00e5dde en treffsikkerhet p\u00e5 91,7%.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Systemet benytter en FPM-strategi (False Positive Mitigation), som reduserer antallet falske alarmer betydelig.<\/span><\/li>\n<\/ul>\n<p>Mange AI-systemer er tatt i bruk for \u00e5 forutsi milj\u00f8katastrofer, blant annet <a href=\"https:\/\/dailyai.com\/nb\/2023\/08\/googles-ai-flood-detection-system-predicts-floods-four-days-in-advance\/\">Googles flomhub<\/a>som nylig ble utvidet til \u00e5 dekke flere regioner.<\/p>","protected":false},"excerpt":{"rendered":"<p>Forskerne brukte kunstig intelligens til \u00e5 identifisere endringer i jordatmosf\u00e6ren som oppst\u00e5r n\u00e5r tsunamib\u00f8lger begynner \u00e5 danne seg i havet.  Dette kan forlenge varslingstiden betydelig for kystsamfunn som er utsatt for tsunamirisiko. Valentino Constantinou fra Terran Orbital Corporation i Florida forklarer: \"Det finnes ikke noe globalt nettverk for \u00e5 oppdage tsunamib\u00f8lger, og det er dyrt \u00e5 installere fysisk maskinvare, som for eksempel b\u00f8yebaserte systemer. Men vi vet at sm\u00e5 satellittkonstellasjoner sprer seg overalt.\" Hastigheten p\u00e5 signalene fra jordskjelv til havs p\u00e5virkes av tettheten av ladede partikler i jordens ionosf\u00e6re, som befinner seg mellom 300 og 350 kilometer over overflaten.<\/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 identify changes in Earth&#039;s atmosphere 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