{"id":15173,"date":"2026-06-19T12:52:02","date_gmt":"2026-06-19T12:52:02","guid":{"rendered":"https:\/\/blog.geostru.eu\/the-grounds-secret-note-what-hvsr-is-and-why-it-matters-for-your-home-too\/"},"modified":"2026-06-19T13:25:05","modified_gmt":"2026-06-19T13:25:05","slug":"the-grounds-secret-note-what-hvsr-is-and-why-it-matters-for-your-home-too","status":"publish","type":"post","link":"https:\/\/blog.geostru.eu\/en\/the-grounds-secret-note-what-hvsr-is-and-why-it-matters-for-your-home-too\/","title":{"rendered":"The ground&#8217;s secret note: what HVSR is (and why it matters for your home too)"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column]<br \/>\n[vc_column_text]<\/p>\n<p>You know how a singer holding a high note can crack a wine glass? Or how pushing a swing at just the right moment sends it higher and higher? It&#8217;s the same phenomenon: <strong>resonance<\/strong>. Every object has its own preferred &#8220;rhythm&#8221; \u2014 a frequency at which it vibrates most easily.<\/p>\n<p>And the ground beneath our feet? It has its note too. It&#8217;s called the <strong>fundamental resonance frequency<\/strong>, written <strong>f0<\/strong>, and knowing it is one of the simplest and cheapest ways to understand how a site will respond to an earthquake. The tool that finds it is called <strong>HVSR<\/strong>.<\/p>\n<h2>How to &#8220;listen&#8221; to the ground<\/h2>\n<p>The ground is never completely still: wind, the sea, traffic and human activity make it vibrate imperceptibly all the time. This background is called <strong>ambient seismic noise<\/strong> (or <em>microtremor<\/em>). It means nothing to the ear; to an instrument, it means a great deal.<\/p>\n<p>HVSR (<em>Horizontal-to-Vertical Spectral Ratio<\/em>, the <strong>Nakamura method<\/strong>) consists of recording that noise with a small <strong>three-component<\/strong> sensor \u2014 North-South, East-West and vertical \u2014 placed on the ground for a few minutes. Then you compare how much the ground vibrates <strong>horizontally<\/strong> versus <strong>vertically<\/strong>: that&#8217;s the <strong>H\/V spectral ratio<\/strong>. No explosives, no drilling: just listening.<\/p>\n<h2>That curve with a peak<\/h2>\n<p>The analysis produces a curve: the H\/V ratio as a function of frequency. At most sites that curve shows a clearly recognisable <strong>peak<\/strong>. The frequency at which the peak falls is precisely <strong>f0<\/strong>, the ground&#8217;s note.<\/p>\n<p>And it already tells us a lot:<\/p>\n<ul>\n<li>a <strong>peak at high frequencies<\/strong> (several Hz) indicates <strong>thin cover<\/strong> over the stiff bedrock;<\/li>\n<li>a <strong>peak at low frequencies<\/strong> (fractions of a Hz) indicates <strong>thick cover<\/strong>;<\/li>\n<li>as a rough estimate, the thickness <em>H<\/em> of the cover is linked to f0 by the relation <strong>H \u2248 Vs \/ (4\u00b7f0)<\/strong>, where <em>Vs<\/em> is the shear-wave velocity in the surface soils.<\/li>\n<\/ul>\n<p>In practice, by listening to the ground&#8217;s whisper for a few minutes you obtain information that would otherwise require far more invasive and expensive surveys.<\/p>\n<h2>Why f0 can &#8220;save&#8221; a building<\/h2>\n<p>Here comes the important part. A <strong>building<\/strong> also has its own natural frequency of oscillation. If the building&#8217;s frequency is <strong>close to the f0 of the ground<\/strong> it stands on, during an earthquake the two resonate together: the shaking is <strong>amplified<\/strong> and the structure is stressed much more. It&#8217;s the effect engineers call <em>double resonance<\/em> \u2014 and it explains why, for the same earthquake, similar buildings on different soils can behave very differently.<\/p>\n<p>Knowing a site&#8217;s f0 therefore serves to:<\/p>\n<ul>\n<li><strong>characterise the subsoil<\/strong> and estimate the Vs velocity profile;<\/li>\n<li>assess the risk of <strong>soil-structure resonance<\/strong>;<\/li>\n<li>feed the <strong>seismic microzonation<\/strong> studies required by regulations.<\/li>\n<\/ul>\n<p>All of this starting from a passive, fast and non-destructive measurement.<\/p>\n<h2>From noise to result, in a few clicks<\/h2>\n<p>Turning that noise into a reliable f0 is exactly what <strong>Easy HVSR<\/strong> does. The workflow is linear and guided:<\/p>\n<ol>\n<li><strong>Traces<\/strong> \u2014 import the recording (SAF, SEG-2, ASCII\u2026);<\/li>\n<li><strong>Selection<\/strong> \u2014 choose the &#8220;clean&#8221; time windows, discarding transients;<\/li>\n<li><strong>Spectral analysis<\/strong> \u2014 smoothing (Konno-Ohmachi) and computation of the average H\/V curve;<\/li>\n<li><strong>H\/V spectrum<\/strong> \u2014 read f0 and check the <strong>SESAME reliability criteria<\/strong>;<\/li>\n<li>(optional) <strong>inversion<\/strong> \u2014 estimate the subsoil Vs profile.<\/li>\n<\/ol>\n<p>The computation engine is developed in-house at GeoStru and validated against the field&#8217;s scientific reference: same physics, reproducible results.<\/p>\n<h2>In short<\/h2>\n<p>Next time you hear about seismic risk, remember the <strong>ground&#8217;s note<\/strong>. It&#8217;s a small number \u2014 f0 \u2014 that holds a lot of information about what lies beneath our feet and how that ground will &#8220;sound&#8221; during an earthquake. And today, to find it, you just need to know how to listen.<\/p>\n<p><strong>Want to try it?<\/strong> Discover <strong>Easy HVSR<\/strong>: the full manual is at <a href=\"https:\/\/help.geostru.io\/easyhvsr\/en\/\" target=\"_blank\" rel=\"noopener\">help.geostru.io\/easyhvsr<\/a>, with a quick-start guide designed even for those new to HVSR.<\/p>\n<p>[\/vc_column_text]<br \/>\n[vc_btn title=&#8221;Discover Easy HVSR&#8221; color=&#8221;warning&#8221; size=&#8221;lg&#8221; align=&#8221;center&#8221; link=&#8221;url:https%3A%2F%2Fwww.geostru.eu%2Fen%2Fshop%2Fsoftware-en%2Fgeophysics-software%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] You know how a singer holding a high note can crack a wine glass? Or how pushing a swing at just the right moment sends it higher and higher? It&#8217;s the same phenomenon: resonance. Every object has its own preferred &#8220;rhythm&#8221; \u2014 a frequency at which it vibrates most easily. And the ground&hellip;<\/p>\n","protected":false},"author":16658,"featured_media":15181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2191,144,2100],"tags":[],"class_list":["post-15173","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earthquake-en","category-geology","category-in-situ-soil-testing","category-2191","category-144","category-2100","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: what the soil resonance frequency f0 is | GeoStru<\/title>\n<meta name=\"description\" content=\"Every soil has its own &quot;note&quot;: the resonance frequency f0. 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