{"id":838,"date":"2015-07-21T16:10:46","date_gmt":"2015-07-21T16:10:46","guid":{"rendered":"http:\/\/ground.geophysicsgpr.com\/?page_id=838"},"modified":"2017-02-28T21:20:50","modified_gmt":"2017-02-28T21:20:50","slug":"methodes-magnetiques-et-electromagnetiques","status":"publish","type":"page","link":"https:\/\/ground.geophysicsgpr.com\/fr\/techniques-de-geophysique-terrestre\/methodes-magnetiques-et-electromagnetiques","title":{"rendered":"M\u00e9thodes magn\u00e9tiques et \u00e9lectromagn\u00e9tiques"},"content":{"rendered":"<div id=\"pl-838\"  class=\"panel-layout\" ><div id=\"pg-838-0\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-838-0-0\"  class=\"panel-grid-cell\" ><div id=\"panel-838-0-0-0\" class=\"so-panel widget widget_sow-editor panel-first-child panel-last-child\" data-index=\"0\" ><div class=\"texte-home-right article panel-widget-style panel-widget-style-for-838-0-0-0\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<h2 class=\"h2resize\">Applications magn\u00e9tiques et \u00e9lectromagn\u00e9tiques<\/h2>\n<p>Plusieurs m\u00e9thodes de g\u00e9ophysique terrestre utilisent les propri\u00e9t\u00e9s des champs magn\u00e9tiques et \u00e9lectromagn\u00e9tiques.\u00a0<\/p>\n<p>L'\u00e9lectromagn\u00e9tisme se distingue du magn\u00e9tisme, champ potentiel vectoriel, par sa capacit\u00e9 \u00e0 \u00ab percevoir \u00bb tout ce qui est conducteur alors que les techniques magn\u00e9tiques ne sont sensibles qu'aux corps ferromagn\u00e9tiques. Ainsi, des socles rocheux poss\u00e9dant des proportions diff\u00e9rentes de min\u00e9raux ferromagn\u00e9siens produiront des signatures magn\u00e9tiques diff\u00e9rentes, alors que des sols argileux et sableux n'en produiront pas n\u00e9cessairement. Un lev\u00e9 \u00e9lectromagn\u00e9tique permettrait de distinguer ces unit\u00e9s dans les deux cas.<\/p>\n<p>De plus, la distance d'influence d'un corps magn\u00e9tique sur un champ est presque infinie. Cependant, comme la r\u00e9solution des mesures de champ est faible, l'utilisation d'un gradient magn\u00e9tique peut \u00eatre pr\u00e9f\u00e9rable dans certains contextes; par exemple pour la localisation de corps de petites tailles se retrouvant pr\u00e8s de la surface.<\/p>\n<h3>Magn\u00e9tom\u00e9trie<\/h3>\n<p>La magn\u00e9tom\u00e9trie mesure les variations \u00e0 l'int\u00e9rieur du champ magn\u00e9tique terrestre. Les anomalies, caus\u00e9es par la mati\u00e8re ferromagn\u00e9tique, peuvent r\u00e9sulter de structures ou d'unit\u00e9s g\u00e9ologiques, de gisements de minerai ou de corps enfouis comme des r\u00e9servoirs de stockage.\u00a0<\/p>\n<p><b>Les applications utilisant le magn\u00e9tisme comprennent:<\/b><\/p>\n<ul>\n<li>L'arch\u00e9ologie;<\/li>\n<li>La cartographie g\u00e9ologique (compl\u00e9ment);<\/li>\n<li>L'exploration mini\u00e8re;<\/li>\n<li>La localisation de corps magn\u00e9tiques enfouis.<\/li>\n<\/ul>\n<h3>\u00c9lectromagn\u00e9tom\u00e9trie<\/h3>\n<p>L'\u00e9lectromagn\u00e9tom\u00e9trie met \u00e0 contribution le champ secondaire induit dans le milieu investigu\u00e9 par les courants de Foucault qui r\u00e9agissent aux courants primaires g\u00e9n\u00e9r\u00e9s par l'application d'un champ \u00e9lectromagn\u00e9tique externe.\u00a0<\/p>\n<p>Ce champ secondaire est mesur\u00e9, analys\u00e9 et trait\u00e9 en fonction de la technique utilis\u00e9e et de l'information recherch\u00e9e.\u00a0<\/p>\n<p><b>Les applications de l'\u00e9lectromagn\u00e9tisme comprennent:<\/b><\/p>\n<ul>\n<li>L'arch\u00e9ologie;<\/li>\n<li>La cartographie de contaminants;<\/li>\n<li>La d\u00e9tection de corps m\u00e9talliques enfouis;<\/li>\n<li>L'exploration mini\u00e8re;<\/li>\n<li>La recherche d'eaux souterraines.<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>Pour plus d'information, veuillez contacter notre <a href=\"mailto:daniel.campos@geophysicsgpr.com;jean-luc.arsenault@geophysicsgpr.com;claude.robillard@geophysicsgpr.com;info@geophysicsgpr.com\">\u00c9quipe de Lev\u00e9 Terrestre<\/a>.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><div id=\"pgc-838-0-1\"  class=\"panel-grid-cell\" ><div id=\"panel-838-0-1-0\" class=\"so-panel widget widget_sow-image panel-first-child panel-last-child\" data-index=\"1\" ><div class=\"panel-widget-style panel-widget-style-for-838-0-1-0\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-image 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src=\"https:\/\/ground.geophysicsgpr.com\/wp-content\/uploads\/sites\/7\/2015\/07\/Ground_Techniques_Electromagnetic_data_plot_landfill.png\" width=\"680\" height=\"438\" srcset=\"https:\/\/ground.geophysicsgpr.com\/wp-content\/uploads\/sites\/7\/2015\/07\/Ground_Techniques_Electromagnetic_data_plot_landfill.png 680w, https:\/\/ground.geophysicsgpr.com\/wp-content\/uploads\/sites\/7\/2015\/07\/Ground_Techniques_Electromagnetic_data_plot_landfill-300x193.png 300w\" sizes=\"auto, (max-width: 680px) 100vw, 680px\" title=\"Ground Techniques Electromagnetic data plot landfill\" alt=\"Ground Techniques Electromagnetic data plot landfill\" \t\tclass=\"so-widget-image\"\/>\n\t<\/div>\n\n<\/div><\/div><\/div><div id=\"panel-838-1-0-1\" class=\"so-panel widget widget_sow-editor panel-last-child\" data-index=\"3\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p>L'image ci-dessus pr\u00e9sente la concentration de d\u00e9bris m\u00e9talliques enfouis dans un site d'enfouissement hors service.<\/p>\n<\/div>\n<\/div><\/div><\/div><div id=\"pgc-838-1-1\"  class=\"panel-grid-cell\" ><div id=\"panel-838-1-1-0\" class=\"so-panel widget widget_sow-image panel-first-child panel-last-child\" data-index=\"4\" ><div class=\"panel-widget-style panel-widget-style-for-838-1-1-0\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-image so-widget-sow-image-default-8b5b6f678277-838\"\n\t\t\t\n\t\t>\n<div class=\"sow-image-container\">\n\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ground.geophysicsgpr.com\/wp-content\/uploads\/sites\/7\/2015\/07\/Ground_techniques_EM61.jpg\" width=\"640\" height=\"480\" srcset=\"https:\/\/ground.geophysicsgpr.com\/wp-content\/uploads\/sites\/7\/2015\/07\/Ground_techniques_EM61.jpg 640w, https:\/\/ground.geophysicsgpr.com\/wp-content\/uploads\/sites\/7\/2015\/07\/Ground_techniques_EM61-300x225.jpg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" title=\"Ground techniques EM61\" alt=\"\" \t\tclass=\"so-widget-image\"\/>\n\t<\/div>\n\n<\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Applications magn\u00e9tiques et \u00e9lectromagn\u00e9tiquesPlusieurs m\u00e9thodes de g\u00e9ophysique terrestre utilisent les propri\u00e9t\u00e9s des champs magn\u00e9tiques et \u00e9lectromagn\u00e9tiques.\u00a0L&rsquo;\u00e9lectromagn\u00e9tisme se distingue du magn\u00e9tisme, champ potentiel vectoriel, par sa capacit\u00e9 \u00e0 \u00ab percevoir \u00bb tout ce qui est conducteur alors que les techniques magn\u00e9tiques ne sont sensibles qu&rsquo;aux corps ferromagn\u00e9tiques. Ainsi, des socles rocheux poss\u00e9dant des proportions diff\u00e9rentes de&#8230;  <a href=\"https:\/\/ground.geophysicsgpr.com\/fr\/techniques-de-geophysique-terrestre\/methodes-magnetiques-et-electromagnetiques\" class=\"more-link\" title=\"Read M\u00e9thodes magn\u00e9tiques et \u00e9lectromagn\u00e9tiques\">Read more &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":1118,"parent":701,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-full-width.php","meta":{"content-type":"","footnotes":""},"class_list":["post-838","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/pages\/838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/comments?post=838"}],"version-history":[{"count":2,"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/pages\/838\/revisions"}],"predecessor-version":[{"id":3015,"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/pages\/838\/revisions\/3015"}],"up":[{"embeddable":true,"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/pages\/701"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/media\/1118"}],"wp:attachment":[{"href":"https:\/\/ground.geophysicsgpr.com\/fr\/wp-json\/wp\/v2\/media?parent=838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}