{"id":17296,"date":"2011-03-04T07:59:57","date_gmt":"2011-03-04T05:59:57","guid":{"rendered":"http:\/\/www.lovendal.net\/wp52\/?p=17296"},"modified":"2011-03-04T07:59:57","modified_gmt":"2011-03-04T05:59:57","slug":"din-secretele-cutremurului-din-4-martie-1977-si-nu-numai","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/din-secretele-cutremurului-din-4-martie-1977-si-nu-numai\/","title":{"rendered":"Din secretele cutremurului din 4 martie 1977 \u015fi nu numai&#8230;"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/03\/cutremur702.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-17297\" title=\"cutremur702\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/03\/cutremur702.jpg\" alt=\"\" width=\"294\" height=\"214\" \/><\/a>V\u0103 prezent\u0103m fragmentele unui interviu cu dr. Marcian Bleahu, geolog de reputa\u0163ie interna\u0163ional\u0103, interviu realizat dup\u0103 devastatorul cutremur din 4 martie 1977:<\/p>\n<p><strong>Cum se determin\u0103 epicentrul unui cutremur<\/strong><\/p>\n<p><strong>Reporter:<\/strong> &#8211; Seara de 4 martie 1977 a readus \u00een actualitate unul dintre cele mai devastatoare fenomene telurice: cutremurele de p\u0103m\u00e2nt. Prin amploarea ariei de ac\u0163iune, prin intensitatea \u015fi viteza lor distructiv\u0103, cutremurele de p\u0103m\u00e2nt suscit\u0103 numeroase probleme de acut interes \u015ftiin\u0163ific. Prima &#8211; o constituie indiscutabil \u00eenregistrarea, localizarea \u015fi evaluarea lor&#8230; De aici \u015fi prima \u00eentrebare: \u00eenregistrarea cutremurelor se face cu exactitate?<\/p>\n<p><strong>dr. Marcian Bleahu:<\/strong> &#8211; Exist\u0103 ast\u0103zi aparate extrem de fine, mecanice, optice \u015fi electronice, care pot detecta cele mai mici trepida\u0163ii ale solului. Pe teritoriul \u0163\u0103rii noastre, ca \u015fi \u00een \u00eentreaga lume dealtfel, se \u00eenregistreaz\u0103 anual mii \u015fi mii de cutremure. Majoritatea sunt imperceptibile omului. Ele iau na\u015ftere \u00een interiorul p\u0103m\u00e2ntului pe plane de discontinuitate, la ad\u00e2ncimi diferite. Punctul unde se produce mi\u015fcarea seismic\u0103 poart\u0103 numele de hipocentru, iar proiec\u0163ia lui la suprafa\u0163\u0103, epicentru. Din hipocentru pleac\u0103 undele \u00een toate direc\u0163iile, cu viteze determinate de natura rocii prin care trec \u015fi de starea fizic\u0103 \u00een care se afl\u0103 rocile respective. \u00cen mod normal, la suprafa\u0163a p\u0103m\u00e2ntului undele seismice se deplaseaz\u0103 cu viteze de 4-8 km\/secund\u0103. Cunosc\u00e2nd dou\u0103 puncte dintr-o regiune \u00een care unda de \u015foc a unui cutremur a ajuns \u00een acela\u015fi timp, este evident c\u0103 epicentrul se afl\u0103 la jum\u0103tatea distan\u0163ei. Prin interpolarea a numeroase \u00eenregistr\u0103ri se determin\u0103 astfel at\u00e2t hipocentrul, c\u00e2t \u015fi epicentrul.<\/p>\n<p><strong>Scara Richter<\/strong><\/p>\n<p><strong>Reporter:<\/strong> &#8211; \u00cen lume exist\u0103 mai multe sisteme de \u00eenregistrarea a cutremurelor, dar standardul r\u0103m\u00e2ne scara Richter. A\u0163i dori s-o explica\u0163i?<\/p>\n<p><strong>dr. Marcian Bleahu: <\/strong>Gradul unui cutremur scade cu distan\u0163a de focar, ceea ce permite s\u0103 se deseneze h\u0103r\u0163i de intensit\u0103\u0163i egale (h\u0103r\u0163i izo-seismice), \u00een care gradul descre\u015fte concentric de la epicentru spre periferie. Descre\u015fterea nu este \u00eens\u0103 regulat\u0103, c\u0103ci intensitatea reflect\u0103 \u015fi natura subsolului, deci un factor local. Pentru a-l elimina, seismologul american Charles Richter a imaginat o metod\u0103 bazat\u0103 pe \u00eenregistr\u0103rile pe aparate, adic\u0103 pe amplitudinea oscila\u0163iei indicat\u0103 de seismograme. Raport\u00e2nd aceast\u0103 amplitudine la distan\u0163a de focar, a ob\u0163inut valori care reflect\u0103 energia degajat\u0103 de cutremur \u00een focar. Cu aceste valori a construit o scar\u0103 a magnitudinilor, care cuprinde opt trepte. De remarcat c\u0103 scara Richter este logaritmic\u0103, astfel c\u0103 trecerea de la o treapt\u0103 la alta \u00eenseamn\u0103 o cre\u015ftere considerabil\u0103 a energiei. Reprezent\u00e2nd valoarea magnitudinii, este aceea\u015fi pentru orice sta\u0163iune care \u00eenregistreaz\u0103 un cutremur, indiferent de distan\u0163\u0103.<\/p>\n<p><strong>Cauzele cutremurelor<\/strong><\/p>\n<p><strong>Reporter:<\/strong> &#8211; Despre cauzele cutremurelor, ce ne-a\u0163i putea spune dvs., ca geolog?<strong><\/strong><\/p>\n<p><strong>dr. Marcian Bleahu: <\/strong>&#8211; Pentru a v\u0103 r\u0103spunde sunt obligat s\u0103 fac o digresiune teoretic\u0103 \u00een domeniul modernelor teorii ale tectonicii globale, aceast\u0103 profund\u0103 revolu\u0163ie \u00een \u015ftiin\u0163ele geologice, care ofer\u0103 \u015fi pentru seisme o explica\u0163ie conving\u0103toare. Conform ei, globul terestru are la suprafa\u0163\u0103 zece pl\u0103ci mari \u015fi c\u00e2teva mai mici, groase de 100 km, cuprinz\u00e2nd ceea ce se nume\u015fte litosfer\u0103 \u015fi care poart\u0103 pe ele, la suprafa\u0163\u0103, at\u00e2t continente, c\u00e2t \u015fi oceane. Dac\u0103 \u00eentre dou\u0103 pl\u0103ci exist\u0103 o mi\u015fcare divergent\u0103, de dep\u0103rtare, \u00eentre ele \u0163\u00e2\u015fnesc topituri din ad\u00e2ncul p\u0103m\u00e2ntului, din mantaua terestr\u0103 ce edific\u0103 lan\u0163urile de mun\u0163i vulcanici de pe fundul oceanelor. Pe fa\u0163a de separa\u0163ie a pl\u0103cilor, care este vertical\u0103, iau na\u015ftere cutremure numeroase de mic\u0103 ad\u00e2ncime, adic\u0103 p\u00e2n\u0103 la 70 km. \u00cen zonele \u00een care pl\u0103cile se mi\u015fc\u0103 convergent, o plac\u0103 intr\u0103 sub alta prin subduc\u0163ie de-a lungul unor plane \u00eenclinate, denumite plane Benioff, dup\u0103 numele unui mare seismolog. Pe planele Benioff iau na\u015ftere cutremurele mijlocii \u015fi profunde, adic\u0103 de la 100 la 700 km ad\u00e2ncime. \u00cen sf\u00eer\u015fit, dac\u0103 dou\u0103 pl\u0103ci alunec\u0103 una pe l\u00e2ng\u0103 alta, f\u0103r\u0103 s\u0103 se distan\u0163eze sau s\u0103 se \u00eencalece, \u00een lungul planului de alunecare au loc cutremure superficiale, ca cele de pe dorsalele suboceanice.<\/p>\n<p><strong>Cutremurul din 1977<\/strong><\/p>\n<p><strong>Reporter:<\/strong> &#8211; Cum arat\u0103 cutremurele din zona Vrancei?<\/p>\n<p><strong>dr. Marcian Bleahu: &#8211;<\/strong> \u00cen general, cutremurele vr\u00e2ncene au orientarea N-E S-V, dar de data aceasta efectele maxime par a nu fi fost \u00een zona epicentrului, \u00een zona Foc\u015fani, ci \u00een Moldova de mijloc (Vaslui), \u00een C\u00e2mpia Rom\u00e2n\u0103 (Ploie\u015fti,\u00a0 Bucure\u015fti, Zimnicea,\u00a0 Alexandria) \u015fi p\u00e2n\u0103 dincolo de malurile Dun\u0103rii. S-ar p\u0103rea c\u0103 vibra\u0163ia puternic\u0103 a resim\u0163it-o placa inferioar\u0103, care se subduce, nu cea superioar\u0103 (\u00een Ardeal efectele au fost mult mai slabe). Direc\u0163ia general\u0103 a efectelor maxime este pu\u0163in aberant\u0103 fa\u0163\u0103 de cea obi\u015fnuit\u0103 la cutremurele vr\u00e2ncene, fiind E-NE-V-SV, adic\u0103 pe o f\u00e2\u015fie ce leag\u0103 Gala\u0163ii de Zimnicea \u015fi care pare a pune \u00een eviden\u0163\u0103 elemente de structur\u0103 suberustal\u0103. Spre deosebire de 1940, zona din imediata apropiere a epicentrului a fost relativ mai pu\u0163in afectat\u0103.<\/p>\n<p><strong>Reporter:<\/strong> &#8211; C\u00e2nd se va mai produce un asemenea mare cutremur?<\/p>\n<p><strong>dr. Marcian Bleahu: &#8211; <\/strong>Un\u00a0 mare cutremur necesit\u0103 un timp \u00eendelungat de acumulare a tensiunii. Marea eliberare de energie din cutremurul de la 4 martie 1977 a epuizat for\u0163ele acumulate \u015fi vor fi necesare probabil decenii pentru ca acumularea s\u0103 ating\u0103 din nou un prag care s\u0103 determine un astfel de seism. P\u00e2n\u0103 atunci \u00eens\u0103 sunt convins c\u0103 \u015ftiin\u0163ele geologice vor progresa at\u00e2t de mult, \u00eenc\u00e2t s\u0103 descopere mijloacele de a prognostica cutremurele \u015fi de a le preveni.<\/p>\n<p><strong>Calamit\u0103\u0163ile naturale se intensific\u0103?<\/strong><\/p>\n<p><strong>Reporter:<\/strong> &#8211; Ne\u00een\u0163elegerea unor fenomene, cum se \u00eent\u00e2mpl\u0103 adesea, \u015fi neexplicarea lor \u015ftiin\u0163ific\u0103 las\u0103 loc interpret\u0103rilor fanteziste. Se vorbe\u015fte astfel chiar \u015fi de o intensificare, pe plan mondial, a calamit\u0103\u0163ilor naturale. Care e adev\u0103rul?<\/p>\n<p><strong>dr. Marcian Bleahu:<\/strong> &#8211; Fire\u015fte, toate aceste fenomene naturale au explica\u0163ii \u015ftiin\u0163ifice. Dac\u0103 avem impresia c\u0103 \u00een ultimul timp s-au acumulat catastrofele, aceasta se datore\u015fte mai multor fapte. \u00cen primul r\u00e2nd, sistemul informa\u0163ional perfec\u0163ionat, care a eliminat distan\u0163ele, astfel c\u0103 avem \u00een fa\u0163a ochilor, pe micul ecran, cele \u00eent\u00e2mplate \u00een \u00eentreaga lume \u00een aceea\u015fi zi, cu impresia c\u0103 evenimentele s-au acumulat. \u00cen ce prive\u015fte cutremurele, ele nu sunt nici mai frecvente, nici mai grave acum ca \u00eenainte, dar ele sunt nocive pentru c\u0103 se abat asupra globului mai populat \u015fi cu a\u015fez\u0103ri urbane mai numeroase.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u0103 prezent\u0103m fragmentele unui interviu cu dr. Marcian Bleahu, geolog de reputa\u0163ie interna\u0163ional\u0103, interviu realizat dup\u0103 devastatorul cutremur din 4 martie 1977: Cum se determin\u0103 epicentrul unui cutremur Reporter: &#8211; Seara de 4 martie 1977 a readus \u00een actualitate unul &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Din secretele cutremurului din 4 martie 1977 \u015fi nu numai&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/din-secretele-cutremurului-din-4-martie-1977-si-nu-numai\/#more-17296\" aria-label=\"Cite\u0219te mai multe despre Din secretele cutremurului din 4 martie 1977 \u015fi nu numai&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":17297,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[1331,3040,4040,74,9803,4041],"class_list":["post-17296","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-cutremur","tag-cutremurul-din-4-martie-1977","tag-geolog","tag-romania","tag-stiinta","tag-vrancea","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Din secretele cutremurului din 4 martie 1977 \u015fi nu numai... - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/din-secretele-cutremurului-din-4-martie-1977-si-nu-numai\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Din secretele cutremurului din 4 martie 1977 \u015fi nu numai...\" \/>\n<meta property=\"og:description\" content=\"V\u0103 prezent\u0103m fragmentele unui interviu cu dr. 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