{"id":15175,"date":"2026-06-19T12:52:16","date_gmt":"2026-06-19T12:52:16","guid":{"rendered":"https:\/\/blog.geostru.eu\/nota-secreta-a-terenului-ce-este-hvsr-si-de-ce-te-priveste-si-pe-tine\/"},"modified":"2026-06-19T13:25:15","modified_gmt":"2026-06-19T13:25:15","slug":"nota-secreta-a-terenului-ce-este-hvsr-si-de-ce-te-priveste-si-pe-tine","status":"publish","type":"post","link":"https:\/\/blog.geostru.eu\/ro\/nota-secreta-a-terenului-ce-este-hvsr-si-de-ce-te-priveste-si-pe-tine\/","title":{"rendered":"Nota secret\u0103 a terenului: ce este HVSR (\u0219i de ce te prive\u0219te \u0219i pe tine)"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column]<br \/>\n[vc_column_text]<\/p>\n<p>\u0218tii cum o c\u00e2nt\u0103rea\u021b\u0103 care \u021bine o not\u0103 \u00eenalt\u0103 poate fisura un pahar de cristal? Sau cum, \u00eemping\u00e2nd un leag\u0103n exact la momentul potrivit, acesta urc\u0103 tot mai sus? Este acela\u0219i fenomen: <strong>rezonan\u021ba<\/strong>. Fiecare obiect are \u201eritmul&#8221; s\u0103u preferat \u2014 o frecven\u021b\u0103 la care vibreaz\u0103 cel mai u\u0219or.<\/p>\n<p>Iar terenul de sub picioarele noastre? \u0218i el are nota lui. Se nume\u0219te <strong>frecven\u021ba fundamental\u0103 de rezonan\u021b\u0103<\/strong>, pe scurt <strong>f0<\/strong>, iar cunoa\u0219terea ei este una dintre cele mai simple \u0219i mai ieftine modalit\u0103\u021bi de a \u00een\u021belege cum va r\u0103spunde un amplasament la un cutremur. Instrumentul care o g\u0103se\u0219te se nume\u0219te <strong>HVSR<\/strong>.<\/p>\n<h2>Cum se \u201eascult\u0103&#8221; terenul<\/h2>\n<p>Terenul nu este niciodat\u0103 complet nemi\u0219cat: v\u00e2ntul, marea, traficul \u0219i activit\u0103\u021bile umane \u00eel fac s\u0103 vibreze imperceptibil \u00een mod continuu. Acest fond se nume\u0219te <strong>zgomot seismic ambiental<\/strong> (sau <em>microtremor<\/em>). Pentru ureche nu \u00eenseamn\u0103 nimic; pentru un instrument, foarte mult.<\/p>\n<p>HVSR (<em>Horizontal-to-Vertical Spectral Ratio<\/em>, <strong>metoda Nakamura<\/strong>) const\u0103 \u00een \u00eenregistrarea acelui zgomot cu un senzor mic cu <strong>trei componente<\/strong> \u2014 Nord-Sud, Est-Vest \u0219i vertical \u2014 a\u0219ezat pe sol timp de c\u00e2teva minute. Apoi se compar\u0103 c\u00e2t de mult vibreaz\u0103 terenul pe <strong>orizontal\u0103<\/strong> fa\u021b\u0103 de <strong>vertical\u0103<\/strong>: este <strong>raportul spectral H\/V<\/strong>. F\u0103r\u0103 explozivi, f\u0103r\u0103 foraje: este suficient s\u0103 ascul\u021bi.<\/p>\n<h2>Acea curb\u0103 cu un v\u00e2rf<\/h2>\n<p>Din analiz\u0103 rezult\u0103 o curb\u0103: raportul H\/V \u00een func\u021bie de frecven\u021b\u0103. \u00cen majoritatea amplasamentelor, aceast\u0103 curb\u0103 prezint\u0103 un <strong>v\u00e2rf<\/strong> u\u0219or de recunoscut. Frecven\u021ba la care cade v\u00e2rful este tocmai <strong>f0<\/strong>, nota terenului.<\/p>\n<p>\u0218i ne spune deja multe:<\/p>\n<ul>\n<li>un <strong>v\u00e2rf la frecven\u021be \u00eenalte<\/strong> (mai mul\u021bi Hz) indic\u0103 <strong>acoperiri sub\u021biri<\/strong> peste substratul rigid;<\/li>\n<li>un <strong>v\u00e2rf la frecven\u021be joase<\/strong> (frac\u021biuni de Hz) indic\u0103 <strong>acoperiri groase<\/strong>;<\/li>\n<li>ca estimare aproximativ\u0103, grosimea <em>H<\/em> a acoperirilor este legat\u0103 de f0 prin rela\u021bia <strong>H \u2248 Vs \/ (4\u00b7f0)<\/strong>, unde <em>Vs<\/em> este viteza undelor de forfecare \u00een solurile de suprafa\u021b\u0103.<\/li>\n<\/ul>\n<p>\u00cen practic\u0103, ascult\u00e2nd \u0219oapta terenului timp de c\u00e2teva minute, se ob\u021bine o informa\u021bie care altfel ar necesita investiga\u021bii mult mai invazive \u0219i mai costisitoare.<\/p>\n<h2>De ce f0 poate \u201esalva&#8221; o cl\u0103dire<\/h2>\n<p>Aici vine partea important\u0103. \u0218i o <strong>cl\u0103dire<\/strong> are propria frecven\u021b\u0103 de oscila\u021bie. Dac\u0103 frecven\u021ba cl\u0103dirii este <strong>apropiat\u0103 de f0 a terenului<\/strong> pe care se sprijin\u0103, \u00een timpul unui cutremur cele dou\u0103 intr\u0103 \u00een rezonan\u021b\u0103 \u00eempreun\u0103: mi\u0219c\u0103rile seismice sunt <strong>amplificate<\/strong>, iar structura este solicitat\u0103 mult mai mult. Este efectul pe care tehnicienii \u00eel numesc <em>dubl\u0103 rezonan\u021b\u0103<\/em> \u2014 \u0219i explic\u0103 de ce, la acela\u0219i cutremur, cl\u0103diri similare pe terenuri diferite se pot comporta foarte diferit.<\/p>\n<p>Cunoa\u0219terea f0 a unui amplasament serve\u0219te, prin urmare, la:<\/p>\n<ul>\n<li><strong>caracterizarea subsolului<\/strong> \u0219i estimarea profilului de viteze Vs;<\/li>\n<li>evaluarea riscului de <strong>rezonan\u021b\u0103 sol-structur\u0103<\/strong>;<\/li>\n<li>alimentarea studiilor de <strong>microzonare seismic\u0103<\/strong> prev\u0103zute de normative.<\/li>\n<\/ul>\n<p>Totul pornind de la o m\u0103sur\u0103toare pasiv\u0103, rapid\u0103 \u0219i nedistructiv\u0103.<\/p>\n<h2>De la zgomot la rezultat, \u00een c\u00e2teva clicuri<\/h2>\n<p>Transformarea acelui zgomot \u00eentr-o f0 fiabil\u0103 este exact ceea ce face <strong>Easy HVSR<\/strong>. Fluxul este liniar \u0219i ghidat:<\/p>\n<ol>\n<li><strong>Trasee<\/strong> \u2014 se import\u0103 \u00eenregistrarea (SAF, SEG-2, ASCII\u2026);<\/li>\n<li><strong>Selec\u021bie<\/strong> \u2014 se aleg ferestrele temporale \u201ecurate&#8221;, elimin\u00e2nd tranzitoriile;<\/li>\n<li><strong>Analiz\u0103 spectral\u0103<\/strong> \u2014 netezire (Konno-Ohmachi) \u0219i calculul curbei H\/V medii;<\/li>\n<li><strong>Spectru H\/V<\/strong> \u2014 se cite\u0219te f0 \u0219i se verific\u0103 <strong>criteriile de fiabilitate SESAME<\/strong>;<\/li>\n<li>(op\u021bional) <strong>inversie<\/strong> \u2014 se estimeaz\u0103 profilul Vs al subsolului.<\/li>\n<\/ol>\n<p>Motorul de calcul este dezvoltat intern la GeoStru \u0219i validat \u00een raport cu referin\u021ba \u0219tiin\u021bific\u0103 a domeniului: aceea\u0219i fizic\u0103, rezultate reproductibile.<\/p>\n<h2>Pe scurt<\/h2>\n<p>Data viitoare c\u00e2nd auzi vorbindu-se despre risc seismic, aminte\u0219te-\u021bi de <strong>nota terenului<\/strong>. Este un num\u0103r mic \u2014 f0 \u2014 care con\u021bine multe informa\u021bii despre ce se afl\u0103 sub picioarele noastre \u0219i despre cum va \u201esuna&#8221; acel teren \u00een timpul unui cutremur. Iar ast\u0103zi, pentru a o g\u0103si, este suficient s\u0103 \u0219tii s\u0103 ascul\u021bi.<\/p>\n<p><strong>Vrei s\u0103-l \u00eencerci?<\/strong> Descoper\u0103 <strong>Easy HVSR<\/strong>: manualul complet este pe <a href=\"https:\/\/help.geostru.io\/easyhvsr\/ro\/\" target=\"_blank\" rel=\"noopener\">help.geostru.io\/easyhvsr<\/a>, cu un ghid rapid g\u00e2ndit \u0219i pentru cei afla\u021bi la \u00eenceput cu HVSR.<\/p>\n<p>[\/vc_column_text]<br \/>\n[vc_btn title=&#8221;Descoper\u0103 Easy HVSR&#8221; color=&#8221;warning&#8221; size=&#8221;lg&#8221; align=&#8221;center&#8221; link=&#8221;url:https%3A%2F%2Fwww.geostru.eu%2Fro%2Fshop%2Fsoftware-ro%2Fgeofizica%2Feasy-hvsr-software-hvsr-processing%2F|target:_blank&#8221;]<br \/>\n[\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column] [vc_column_text] \u0218tii cum o c\u00e2nt\u0103rea\u021b\u0103 care \u021bine o not\u0103 \u00eenalt\u0103 poate fisura un pahar de cristal? Sau cum, \u00eemping\u00e2nd un leag\u0103n exact la momentul potrivit, acesta urc\u0103 tot mai sus? Este acela\u0219i fenomen: rezonan\u021ba. Fiecare obiect are \u201eritmul&#8221; s\u0103u preferat \u2014 o frecven\u021b\u0103 la care vibreaz\u0103 cel mai u\u0219or. Iar terenul de sub picioarele&hellip;<\/p>\n","protected":false},"author":16658,"featured_media":15181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2183,1595,1998],"tags":[],"class_list":["post-15175","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cutremur","category-geologie","category-incercari-in-situ","category-2183","category-1595","category-1998","description-off"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HVSR: ce este frecven\u021ba de rezonan\u021b\u0103 f0 a terenului | GeoStru<\/title>\n<meta name=\"description\" content=\"Fiecare teren are \u00abnota\u00bb lui: frecven\u021ba de rezonan\u021b\u0103 f0. 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