{"id":60490,"date":"2026-05-04T01:10:11","date_gmt":"2026-05-04T01:10:11","guid":{"rendered":"https:\/\/www.europesays.com\/sk\/60490\/"},"modified":"2026-05-04T01:10:11","modified_gmt":"2026-05-04T01:10:11","slug":"pod-oceanom-pri-severnej-amerike-sa-trha-tektonicka-doska-obavane-zemetrasenie-the-big-one-moze-prebehnut-inak-nez-sa-predpokladalo-vosveteit-sk","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/sk\/60490\/","title":{"rendered":"Pod oce\u00e1nom pri Severnej Amerike sa trh\u00e1 tektonick\u00e1 doska. Ob\u00e1van\u00e9 zemetrasenie The Big One m\u00f4\u017ee prebehn\u00fa\u0165 inak, ne\u017e sa predpokladalo | Vosveteit.sk"},"content":{"rendered":"

Pri pobre\u017e\u00ed severoz\u00e1padu Severnej Ameriky sa odohr\u00e1va proces, ktor\u00fd men\u00ed poh\u013ead vedcov na fungovanie plan\u00e9ty. Hlboko pod oce\u00e1nom sa tektonick\u00e1 doska postupne trh\u00e1 a rozpad\u00e1. Nejde o n\u00e1hlu katastrofu, ale o dlhodob\u00fd proces, ktor\u00fd sa teraz vedcom podarilo zachyti\u0165 s nezvy\u010dajnou presnos\u0165ou.<\/p>\n

V\u00fdskum z Columbia Climate School<\/a> sa zameral na subduk\u010dn\u00fa z\u00f3nu Cascadia, kde sa oce\u00e1nske dosky Juan de Fuca a Explorer zas\u00favaj\u00fa pod severoamerick\u00fa dosku. Tak\u00e9to miesta patria medzi najakt\u00edvnej\u0161ie na Zemi. Pr\u00e1ve tu vznikaj\u00fa siln\u00e9 zemetrasenia a sopky<\/a>.<\/p>\n

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Odoberaj Vosveteit.sk cez Telegram a prihl\u00e1s sa k odberu spr\u00e1v
\n <\/a><\/p>\n

V\u00fdskum uk\u00e1zal, \u017ee tieto syst\u00e9my sa nerozpadaj\u00fa n\u00e1hle<\/p>\n

Vedci dlh\u00e9 roky rie\u0161ili ot\u00e1zku, ako sa tak\u00e9to syst\u00e9my vlastne skon\u010dia. Nov\u00e9 d\u00e1ta uk\u00e1zali, \u017ee odpove\u010f nie je dramatick\u00e1, ale sk\u00f4r postupn\u00e1. Doska sa neroztrhne jedn\u00fdm ve\u013ek\u00fdm zlomom, ale rozpadne sa na men\u0161ie \u010dasti, pri\u010dom ka\u017ed\u00fd kus sa odtrhne samostatne a vytvor\u00ed tzv. mikroplat\u0148u.<\/p>\n

\"tektonicke\"tektonickeZdroj: Mopic \/ Shutterstock.com<\/p>\n

\u201eSpusti\u0165 subdukciu je ako tla\u010di\u0165 vlak do kopca, potrebuje\u0161 na to obrovsk\u00fa silu. Ke\u010f sa v\u0161ak rozbehne, ned\u00e1 sa zastavi\u0165. Na jej ukon\u010denie treba nie\u010do dramatick\u00e9, v podstate vlakov\u00fa nehodu,\u201c vysvetlil geol\u00f3g Brandon Shuck.<\/p>\n

Nov\u00e9 merania uk\u00e1zali, \u017ee cel\u00fd proces pripom\u00edna sk\u00f4r postupn\u00e9 rozoberanie. Doska sa trh\u00e1 k\u00fasok po k\u00fasku.<\/p>\n

\u201ePrv\u00fdkr\u00e1t m\u00e1me jasn\u00fd obraz subduk\u010dnej z\u00f3ny priamo po\u010das jej z\u00e1niku,\u201c uviedol Shuck: \u201eNamiesto jedn\u00e9ho kolapsu sa doska trh\u00e1 postupne a vytv\u00e1ra men\u0161ie mikroplatne.\u201c<\/p>\n

Tak\u00fdto rozpad zni\u017euje \u201e\u0165ah\u201c celej dosky smerom nadol. Ka\u017ed\u00fd odtrhnut\u00fd kus znamen\u00e1 menej energie v syst\u00e9me.<\/p>\n

Neprehliadni
\n <\/p>\n

\"Samsung\"Samsung <\/p>\n

\n\t\t\t\t\t4 skryt\u00e9 AI funkcie v Samsung telef\u00f3noch: Nad\u00e1vam si, \u017ee som ich doteraz nepou\u017e\u00edval. Z\u00e1sadne mi zjednodu\u0161ili pou\u017e\u00edvanie mobilu <\/p>\n

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Znie to dramaticky, no v\u00fdskumn\u00edci to v\u00f4bec nepova\u017euj\u00fa za zl\u00fa spr\u00e1vu<\/p>\n

Na prv\u00fd poh\u013ead znie trhanie zemskej k\u00f4ry ako probl\u00e9m. V \u0161ir\u0161om kontexte v\u0161ak ide sk\u00f4r o postupn\u00e9 \u201evyp\u00ednanie motora\u201c, ktor\u00fd poh\u00e1\u0148a subdukciu. Ke\u010f sa ve\u013ek\u00e1 doska rozdel\u00ed na men\u0161ie \u010dasti, tie u\u017e nemaj\u00fa rovnak\u00fa hmotnos\u0165 ani zotrva\u010dnos\u0165. Syst\u00e9m tak str\u00e1ca energiu.<\/p>\n

V horizonte mili\u00f3nov rokov to m\u00f4\u017ee vies\u0165 k \u00fapln\u00e9mu zastaveniu subdukcie v tejto oblasti. Pobre\u017eie by sa t\u00fdm postupne stabilizovalo, podobne ako dnes p\u00f4sob\u00ed napr\u00edklad atlantick\u00e9 pobre\u017eie, kde sa tektonick\u00e9 dosky<\/a> nepods\u00favaj\u00fa.<\/p>\n

Regi\u00f3n Cascadia je zn\u00e1my aj kv\u00f4li o\u010dak\u00e1van\u00e9mu obrovsk\u00e9mu zemetraseniu, ktor\u00e9 sa \u010dasto ozna\u010duje ako \u201eThe Big One\u201c, teda vo vo\u013enom preklade \u201eto ve\u013ek\u00e9\u201c. Vedci predpokladaj\u00fa, \u017ee toto zemetrasenie<\/a> bude ma\u0165 magnit\u00fadu okolo 9,0 alebo viac.<\/p>\n

Nov\u00fd objav v\u0161ak nazna\u010duje e\u0161te jednu zauj\u00edmav\u00fa vec. Trhliny v doske m\u00f4\u017eu fungova\u0165 ako prirodzen\u00e9 bari\u00e9ry. Ak sa doska rozpadne na viac \u010dast\u00ed, otras sa nemus\u00ed \u0161\u00edri\u0165 cez cel\u00fa oblas\u0165 naraz. Energia sa m\u00f4\u017ee zastavi\u0165 na jednej z trhl\u00edn.<\/p>\n

To m\u00f4\u017ee vies\u0165 k tzv. segment\u00e1cii. Namiesto jedn\u00e9ho extr\u00e9mne siln\u00e9ho zemetrasenia by mohlo d\u00f4js\u0165 k s\u00e9rii men\u0161\u00edch otrasov. Tie by st\u00e1le sp\u00f4sobili ve\u013ek\u00e9 \u0161kody, no priebeh by sa l\u00ed\u0161il od scen\u00e1ra jednej mas\u00edvnej udalosti.<\/p>\n

Vedci vyu\u017eili kombin\u00e1ciu seizmick\u00e9ho zobrazovania a z\u00e1znamov zemetrasen\u00ed. Z\u00edskali tak detailn\u00fd obraz podmorsk\u00e9ho prostredia. Ten uk\u00e1zal, \u017ee niektor\u00e9 \u010dasti trhl\u00edn zostali akt\u00edvne, in\u00e9 \u00faplne \u201est\u00edchli\u201c. Pr\u00e1ve tieto tich\u00e9 z\u00f3ny ukazuj\u00fa, kde sa doska u\u017e oddelila.<\/p>\n

\u201eKe\u010f sa kus dosky \u00faplne oddel\u00ed, prestane produkova\u0165 zemetrasenia, preto\u017ee horniny u\u017e nie s\u00fa spojen\u00e9,\u201c dod\u00e1va Shuck.<\/p>\n

\"zemske\"zemskeZdroj: Vadim Sadovski \/ Shutterstock.com
\nRozpadom dosky sa men\u00ed aj prostredie vn\u00fatri Zeme<\/p>\n

Subduk\u010dn\u00e9 z\u00f3ny nezohr\u00e1vaj\u00fa \u00falohu len na povrchu. Funguj\u00fa aj ako recykla\u010dn\u00fd syst\u00e9m plan\u00e9ty<\/a>. Star\u00fa zemsk\u00fa k\u00f4ru posielaj\u00fa sp\u00e4\u0165 do pl\u00e1\u0161\u0165a, kde sa roztav\u00ed. Ke\u010f sa tento proces spomal\u00ed alebo zastav\u00ed, men\u00ed sa aj tepeln\u00e1 rovnov\u00e1ha v hlbin\u00e1ch Zeme. Odtrhnut\u00e9 kusy dosiek sa m\u00f4\u017eu potopi\u0165 hlb\u0161ie do hor\u00faceho pl\u00e1\u0161\u0165a.<\/p>\n

To m\u00f4\u017ee spusti\u0165 vznik magmy na miestach, kde by sme to be\u017ene ne\u010dakali, napr\u00edklad \u010falej od pobre\u017eia a cel\u00fd tento rozpad trv\u00e1 mili\u00f3ny rokov.\u00a0<\/p>\n

\u201eTieto nov\u00e9 zistenia n\u00e1m pom\u00e1haj\u00fa lep\u0161ie pochopi\u0165 \u017eivotn\u00fd cyklus tektonick\u00fdch dosiek, ktor\u00e9 formuj\u00fa Zem,\u201c hovor\u00ed spoluautorka \u0161t\u00fadie, vedky\u0148a Suzanne Carbotte.<\/p>\n

Nov\u00e1 \u0161t\u00fadia d\u00e1va vedcom ove\u013ea lep\u0161iu predstavu o tom, \u010do sa pod povrchom deje a pre\u010do sa aj tie najv\u00e4\u010d\u0161ie geologick\u00e9 syst\u00e9my \u010dasom rozpadn\u00fa.<\/p>\n


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