{"id":38632,"date":"2026-02-26T12:00:00","date_gmt":"2026-02-26T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme"},"modified":"2026-02-26T12:00:00","modified_gmt":"2026-02-26T12:00:00","slug":"grincement-des-baskets-sur-le-parquet-comme-mini-seisme","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/guinee-conakry\/toutes-les-actualites\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme","title":{"rendered":"Grincement des Baskets sur le Parquet comme Mini-S\u00e9isme"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Guin\u00e9e. <\/strong><\/span>On connai\u0302t tous le crissement souvent stressant, du coup de frein brutal d\u2019un ve\u0301lo ou de la sneaker qui freine d\u2019un coup sur le terrain de basket. Mais, au-dela\u0300 de leur bruit horripilant, ces deux actions ont en commun d\u2019illustrer ce qu\u2019il se passe lorsque un mate\u0301riau souple entre en friction avec un plus rigide. Arme\u0301s de leur came\u0301ra haute-vitesse, Katia Bertoldi, de l\u2019Universite\u0301 de Harvard (Etats-Unis), et ses colle\u0300gues ont capture\u0301 le phe\u0301nome\u0300ne pour en tirer une explication dans les pages de la revue Nature.<\/p>\n<p>Des travaux pre\u0301ce\u0301dents avaient sugge\u0301re\u0301 que les ondes sonores du crissement pouvaient re\u0301sulter du contact intermittent entre les deux surfaces. Mais ces e\u0301tudes s\u2019e\u0301taient concentre\u0301es sur des frictions lentes, insuffisantes a\u0300 cre\u0301er les \u00ab SQUIIIIIIK ! \u00bb caracte\u0301ristiques.<\/p>\n<p><b>Un train d\u2019ondes supersoniques<\/b><\/p>\n<p>D\u2019ou\u0300 l\u2019ambition d\u2019observer ces interactions a\u0300 haute vitesse, 1 million d\u2019images a\u0300 la seconde. Les scientifiques ont filme\u0301 une sneaker \u00ab couinant \u00bb lorsqu\u2019elle de\u0301rapait tre\u0300s vite, a\u0300 36 km\/h, sur un plancher de verre. A\u0300 la surface de la semelle, sont alors apparues des de\u0301formations ondulant a\u0300 la manie\u0300re d\u2019une vague, chacune accompagne\u0301e d\u2019un mini-crissement dont la hauteur e\u0301tait conditionne\u0301e par l\u2019e\u0301paisseur et la durete\u0301 de la semelle. Confirmant l\u2019existence d\u2019un train d\u2019ondes a\u0300 haute vitesse se propageant le long de l\u2019interface entre la plancher et les motifs de la semelle.<\/p>\n<p>La me\u0302me expe\u0301rience mene\u0301e avec des blocs de caoutchouc totalement plats frotte\u0301s sur du verre donnaient des pulsations sonores plus irre\u0301gulie\u0300res qui, au bout du compte, ressemblaient plus a\u0300 un vrombissement.<\/p>\n<p><b>Et la lumie\u0300re fut !<\/b><\/p>\n<p>Mais l\u2019expe\u0301rience a re\u0301ve\u0301le\u0301 autre chose, de totalement inattendu. A plusieurs occasions, les images haute-vitesse ont de\u0301voile\u0301 aux chercheurs que la friction produisait des mini-e\u0301clairs ! Des de\u0301charges triboe\u0301lectriques de me\u0302me nature que celles ge\u0301ne\u0301re\u0301es par exemple par le frottement d\u2019un lainage sur un tube de verre.<\/p>\n<p>Puisqu\u2019il existe une relation directe entre la fre\u0301quence sonore e\u0301mise et la hauteur et durete\u0301 de la semelle, certains des membres de l\u2019e\u0301quipe se sont livre\u0301s a\u0300 une petite de\u0301monstration musicale. Munis de blocs cre\u0301nele\u0301s de diffe\u0301rentes hauteurs, ils ont pu rejouer la marche impe\u0301riale de Star Wars (voir la vide\u0301o ci-dessous).<\/p>\n<p>Bien entendu, les implications de\u0301passent le seul proble\u0300me des chaussures qui couinent. La rencontre brutale entre une surface solide et une qui l\u2019est un peu moins est caracte\u0301ristique des tremblements de terre et autres mouvements tectoniques. La\u0300 aussi, le long des lignes de faille, le se\u0301isme va s\u2019accompagner de trains d\u2019ondes sonores parfois plus rapides que la vitesse du son. Et beaucoup plus de\u0301vastateurs.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Guin\u00e9e<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Guin\u00e9e. On connai\u0302t tous le crissement souvent stressant, du coup de frein brutal d\u2019un ve\u0301lo ou de la sneaker qui freine d\u2019un coup sur le terrain de basket. Mais, au-dela\u0300 de leur bruit horripilant, ces deux actions ont en commun d\u2019illustrer ce qu\u2019il se passe lorsque un mate\u0301riau souple entre en friction avec [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":38631,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[58],"class_list":["post-38632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-guinee"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Grincement des Baskets sur le Parquet comme Mini-S\u00e9isme - guinee Conakry<\/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.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Grincement des Baskets sur le Parquet comme Mini-S\u00e9isme\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Guin\u00e9e. On connai\u0302t tous le crissement souvent stressant, du coup de frein brutal d\u2019un ve\u0301lo ou de la sneaker qui freine d\u2019un coup sur le terrain de basket. Mais, au-dela\u0300 de leur bruit horripilant, ces deux actions ont en commun d\u2019illustrer ce qu\u2019il se passe lorsque un mate\u0301riau souple entre en friction avec [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme\" \/>\n<meta property=\"og:site_name\" content=\"guinee Conakry\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-26T12:00:00+00:00\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/guinee-conakry\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Grincement des Baskets sur le Parquet comme Mini-S\u00e9isme\",\"datePublished\":\"2026-02-26T12:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme\"},\"wordCount\":521,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/conakry\/sites\/63\/2026\/02\/sm_1772177608.579547.jpg\",\"keywords\":[\"Guin\u00e9e\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme\",\"url\":\"https:\/\/www.africa-press.net\/guinee-conakry\/politique\/grincement-des-baskets-sur-le-parquet-comme-mini-seisme\",\"name\":\"Grincement des Baskets sur le Parquet comme Mini-S\u00e9isme - 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