{"id":110433,"date":"2014-08-11T17:11:59","date_gmt":"2014-08-11T17:11:59","guid":{"rendered":"https:\/\/bm.dev.synology.me\/?p=110433"},"modified":"2014-08-11T17:11:59","modified_gmt":"2014-08-11T17:11:59","slug":"un-mega-seism-produs-in-chile-a-zguduit-gheturile-din-antarctica","status":"publish","type":"post","link":"https:\/\/bm.dev.synology.me\/?p=110433","title":{"rendered":"Un mega-seism produs \u00een Chile a zguduit ghe\u0163urile din Antarctica"},"content":{"rendered":"<p>\nLa \u015fase ore dup\u0103 puternicul cutremur de p\u0103m\u00e2nt care a zguduit coastele chiliene, senzorii instala\u0163i \u00een Antarctica occidental\u0103 au \u00eenregistrat mici seisme, furniz\u00e2nd astfel pentru prima dat\u0103 oamenilor de \u015ftiin\u0163\u0103 dovada faptului c\u0103 <strong>cea mai mare acumulare de ghea\u0163\u0103 din lume poate fi afectat\u0103 la r\u00e2ndul ei de seismele \u00eendep\u0103rtate \u015fi foarte puternice<\/strong>, afirm\u0103 autorii acestui studiu.<\/p>\n<p>\nUn num\u0103r de 12 dintre cele 42 de sta\u0163ii de cercet\u0103ri \u015ftiin\u0163ifice de pe continentul \u00eenghe\u0163at au prezentat &#8220;semne clare&#8221; ale unui v\u00e2rf de activitate seismic\u0103 de \u00eenalt\u0103 frecven\u0163\u0103, sinonim\u0103 cu fracturarea ghe\u0163urilor \u00een apropiere de suprafa\u0163\u0103, au explicat cercet\u0103torii de la revista britanic\u0103 Nature Geoscience.<\/p>\n<p>\n<strong>Mega-seismul care a lovit regiunea chilian\u0103 Maule pe 27 februarie 2010 a avut o magnitudine de 8,8, fiind unul dintre cele mai puternice cutremure cunoscute p\u00e2n\u0103 \u00een prezent. Seismul a f\u0103cut peste 500 de victime \u015fi a provocat pagube materiale estimate la peste 22 milioane de euro.<\/strong><\/p>\n<p>\nCutremurul chilian a declan\u015fat micro-seisme care au fost resim\u0163ite p\u00e2n\u0103 \u00een America de Nord, pe m\u0103sur\u0103 ce unda de \u015foc se propaga prin scoar\u0163a terestr\u0103 \u015fi provoca mi\u015fc\u0103ri \u00een anumite falii tectonice.<\/p>\n<p>\nGeologii \u00eencearc\u0103 de mult\u0103 vreme s\u0103 \u00een\u0163eleag\u0103 felul \u00een care calotele glaciare din Groenlanda \u015fi Antarctica &#8211; al c\u0103rei subsol este, de altfel, considerat relativ calm din punct de vedere seismic &#8211; ar reac\u0163iona \u00een cazul unor cutremure masive produse \u00een alte puncte de pe Glob.<\/p>\n<p>\nP\u00e2n\u0103 \u00een urm\u0103 cu c\u00e2\u0163iva ani, ei nu dispuneau de nicio explica\u0163ie satisf\u0103c\u0103toare, p\u00e2n\u0103 la implementarea unei re\u0163ele de senzori pe ghe\u0163urile antarctice.<\/p>\n<p>\nChiar dac\u0103 semnalele primite dup\u0103 seismul chilian din 2010 au r\u0103mas, global, pu\u0163in precise, semnale nete de activitate seismic\u0103 au fost \u00eenregistrate \u00eentr-o sta\u0163ie \u015ftiin\u0163ific\u0103, Monts Ellsworth, aflat\u0103 \u00een vestul Antarcticii, care a identificat semn\u0103tura caracteristic\u0103 a unui seism. Totu\u015fi, alte sta\u0163ii din vecin\u0103tate nu au detectat \u00een aceea\u015fi perioad\u0103 niciun semnal concludent.<\/p>\n<p>\nPotrivit lui Zhigang Peng, cercet\u0103tor la Institutul de Tehnologie Georgia din ora\u015ful american Atlanta, aceste incoeren\u0163e aparente sunt cel mai probabil asociate cu faptul c\u0103 acele mi\u015fc\u0103ri proveneau din stratul de ghea\u0163\u0103 care acoper\u0103 regiunea, nu din solul st\u00e2ncos situat sub acesta.<\/p>\n<p>\n&#8220;Nu suntem siguri 100%, dar noi credem c\u0103 semnalele seismice erau emise de fracturarea ghe\u0163urilor din calot\u0103, probabil foarte aproape de suprafa\u0163\u0103&#8221;, a explicat el.<\/p>\n<p>\nAceste date sugereaz\u0103 faptul c\u0103 sec\u0163iuni \u00eentregi din calota glaciar\u0103 pot fi fragilizate de mega-seisme, chiar dac\u0103 acestea se produc la distan\u0163e de mai multe mii de kilometri. Cercet\u0103torii afirm\u0103 c\u0103 au nevoie de o serie de studii suplimentare pentru a \u00een\u0163elege mai bine fenomenul \u015fi pentru a afla, de pild\u0103, dac\u0103 un astfel de seim este capabil s\u0103 provoace crevase \u00een Antarctica sau s\u0103 accelereze progresia unui ghe\u0163ar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un mega-seism devastator produs \u00een 2010 \u00een Chile a determinat &#8220;o mi\u015fcare a ghe\u0163urilor&#8221; din Antarctica, aflate la o distan\u0163\u0103 de aproape 5.000 de kilometri de acel stat sud-american, a dezv\u0103luit un studiu publicat duminic\u0103.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[510],"tags":[20891,5837,16154],"class_list":["post-110433","post","type-post","status-publish","format-standard","hentry","category-actualitate","tag-antarctica","tag-chile","tag-seism"],"_links":{"self":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts\/110433","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=110433"}],"version-history":[{"count":0,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts\/110433\/revisions"}],"wp:attachment":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=110433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=110433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=110433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}