{"id":11552,"date":"2021-07-14T19:32:58","date_gmt":"2021-07-14T17:32:58","guid":{"rendered":"http:\/\/volcanx.cluster031.hosting.ovh.net\/?page_id=11552"},"modified":"2021-07-15T11:36:15","modified_gmt":"2021-07-15T09:36:15","slug":"tremblements-de-terre","status":"publish","type":"page","link":"https:\/\/volcanofoundation.org\/fr\/renforcer-la-connaissance-des-risques\/monitoring\/tremblements-de-terre\/","title":{"rendered":"TREMBLEMENTS DE TERRE"},"content":{"rendered":"<div id=\"av_section_1\" class=\"avia-section av-av_section-a3505495476c97acb77226663f388d50 main_color avia-section-default avia-no-border-styling  avia-builder-el-0  el_before_av_section  avia-builder-el-first  avia-full-stretch av-parallax-section avia-bg-style-parallax av-minimum-height av-minimum-height-25 av-height-25  container_wrap fullsize\" data-section-bg-repeat=\"stretch\" data-av_minimum_height_pc=\"25\" data-av_min_height_opt=\"25\"><div class=\"av-parallax\" data-avia-parallax-ratio=\"0.3\"><div class=\"av-parallax-inner main_color avia-full-stretch\"><\/div><\/div><div class=\"container av-section-cont-open\"><main role=\"main\" itemprop=\"mainContentOfPage\" class=\"template-page content  av-content-full alpha units\"><div class=\"post-entry post-entry-type-page post-entry-11552\"><div class=\"entry-content-wrapper clearfix\">\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_one_fifth-25347b0a799d5b9f7058434b2a9c3182\">\n.flex_column.av-av_one_fifth-25347b0a799d5b9f7058434b2a9c3182{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div class=\"flex_column av-av_one_fifth-25347b0a799d5b9f7058434b2a9c3182 av_one_fifth  avia-builder-el-1  el_before_av_three_fifth  avia-builder-el-first  first flex_column_div av-zero-column-padding  \"><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_three_fifth-f7c1061df29de8cca6b42fcf455fe4a0\">\n.flex_column.av-av_three_fifth-f7c1061df29de8cca6b42fcf455fe4a0{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div class=\"flex_column av-av_three_fifth-f7c1061df29de8cca6b42fcf455fe4a0 av_three_fifth  avia-builder-el-2  el_after_av_one_fifth  el_before_av_one_fifth  flex_column_div av-zero-column-padding  \"><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_textblock-8d09e837ca2380e6bdc85d849f6641d9\">\n#top .av_textblock_section.av-av_textblock-8d09e837ca2380e6bdc85d849f6641d9 .avia_textblock{\ncolor:#ffffff;\n}\n<\/style>\n<section class=\"av_textblock_section av-av_textblock-8d09e837ca2380e6bdc85d849f6641d9 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock av_inherit_color\" itemprop=\"text\"><div class=\"h2-cinta-programas\">\n<h1 style=\"text-align: center; font-size: 2.5em;\">RENFORCER LA CONNAISSANCE DES RISQUES<\/h1>\n<\/div>\n<\/div><\/section><br>\n<section class=\"av_textblock_section av-av_textblock-820f97e5aca1e77a0a12cd8a6430c9f2 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><p class=\"p-cinta-programas\" style=\"text-align: center; background: #f5312a !important;\">POURQUOI LA FONDATION EST N&Eacute;E ?<span class=\"flecha-donativo\" style=\"vertical-align: inherit;\"> &gt;<\/span><\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_one_fifth-f7c1061df29de8cca6b42fcf455fe4a0\">\n.flex_column.av-av_one_fifth-f7c1061df29de8cca6b42fcf455fe4a0{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div class=\"flex_column av-av_one_fifth-f7c1061df29de8cca6b42fcf455fe4a0 av_one_fifth  avia-builder-el-5  el_after_av_three_fifth  avia-builder-el-last  flex_column_div av-zero-column-padding  \"><\/div>\n\n<\/div><\/div><\/main><!-- close content main element --><\/div><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k3yaxsym-b831a12c8acddceb21a18cbb360fd41d\">\n.avia-section.av-k3yaxsym-b831a12c8acddceb21a18cbb360fd41d{\nbackground-color:#000000;\nbackground-image:unset;\n}\n.avia-section.av-k3yaxsym-b831a12c8acddceb21a18cbb360fd41d .av-section-color-overlay{\nopacity:0.9;\nbackground-color:#000000;\n}\n<\/style>\n<div id=\"av_section_2\" class=\"avia-section av-k3yaxsym-b831a12c8acddceb21a18cbb360fd41d main_color avia-section-default avia-no-border-styling  avia-builder-el-6  el_after_av_section  el_before_av_textblock  avia-bg-style-fixed av-section-color-overlay-active container_wrap fullsize\"><div class=\"av-section-color-overlay-wrap\"><div class=\"av-section-color-overlay\"><\/div><div class=\"container av-section-cont-open\"><div class=\"template-page content  av-content-full alpha units\"><div class=\"post-entry post-entry-type-page post-entry-11552\"><div class=\"entry-content-wrapper clearfix\">\n<div class=\"flex_column_table av-a5p0bb-0286912bb6bfb93801b9fa33860921b2 sc-av_one_full av-equal-height-column-flextable\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-a5p0bb-0286912bb6bfb93801b9fa33860921b2\">\n.flex_column.av-a5p0bb-0286912bb6bfb93801b9fa33860921b2{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div class=\"flex_column av-a5p0bb-0286912bb6bfb93801b9fa33860921b2 av_one_full  avia-builder-el-7  avia-builder-el-no-sibling  first flex_column_table_cell av-equal-height-column av-align-middle av-zero-column-padding  \"><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-joihkone-69e81b3ac324ed7c1268b0d71e700013\">\n#top .av_textblock_section.av-joihkone-69e81b3ac324ed7c1268b0d71e700013 .avia_textblock{\nfont-size:18px;\ncolor:#ffffff;\n}\n\n@media only screen and (min-width: 768px) and (max-width: 989px){ \n#top .av_textblock_section.av-joihkone-69e81b3ac324ed7c1268b0d71e700013 .avia_textblock{\nfont-size:16px;\n}\n}\n\n@media only screen and (min-width: 480px) and (max-width: 767px){ \n#top .av_textblock_section.av-joihkone-69e81b3ac324ed7c1268b0d71e700013 .avia_textblock{\nfont-size:16px;\n}\n}\n\n@media only screen and (max-width: 479px){ \n#top .av_textblock_section.av-joihkone-69e81b3ac324ed7c1268b0d71e700013 .avia_textblock{\nfont-size:16px;\n}\n}\n<\/style>\n<section class=\"av_textblock_section av-joihkone-69e81b3ac324ed7c1268b0d71e700013 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock av_inherit_color\" itemprop=\"text\"><blockquote>\n<p><a href=\"http:\/\/www.undrr.org\"><strong>LES DISASTERS NE SONT PAS NATURELS<\/strong><\/a>, ils sont construits socialement, par manque de pr&eacute;paration, de pr&eacute;vention, de travail d&rsquo;att&eacute;nuation, d&rsquo;&eacute;ducation et de suivi. <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;CE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Abr&eacute;viation de &amp;quot;l&amp;#039;&egrave;re commune&amp;quot; ou &amp;quot;l&amp;#039;&egrave;re actuelle&amp;quot;. CE se r&eacute;f&egrave;re &agrave; l&amp;#039;ann&eacute;e &eacute;coul&eacute;e depuis le d&eacute;but de l&amp;#039;&egrave;re actuelle dans le calendrier julien ou gr&eacute;gorien, par exemple l&amp;#039;ann&eacute;e civile. L&amp;#039;&egrave;re pr&eacute;c&eacute;dente est appel&eacute;e &amp;quot;Avant l&amp;#039;&egrave;re actuelle&amp;quot; ou BCE.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/ce-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>Ce<\/a> sont des risques ou des dangers naturels qui ont un impact sur les soci&eacute;t&eacute;s vuln&eacute;rables. Les connaissances aident &agrave; <strong>r&eacute;duire la vuln&eacute;rabilit&eacute; sociale<\/strong> et <strong>structurale<\/strong> afin d&rsquo;avoir des soci&eacute;t&eacute;s plus <strong>r&eacute;silientes<\/strong>!<\/p>\n<\/blockquote>\n<\/div><\/section><\/div><\/div><!--close column table wrapper. Autoclose: 1 -->\n<\/div><\/div><\/div><!-- close content main div --><\/div><\/div><\/div><div id=\"after_section_2\" class=\"main_color av_default_container_wrap container_wrap fullsize\"><div class=\"container av-section-cont-open\"><div class=\"template-page content  av-content-full alpha units\"><div class=\"post-entry post-entry-type-page post-entry-11552\"><div class=\"entry-content-wrapper clearfix\">\n<section class=\"av_textblock_section av-kqt9jd5e-cd33964ef4e3b772df7fef522b816d29 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><h2>Surveiller la sismicit&eacute; des volcans permet de <a href=\"http:\/\/www.undrr.org\">comprendre<\/a> la structure des volcans<\/h2>\n<\/div><\/section>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqt9ln1w-f6affe7cdeee6be02fc225bbc4bc5689\">\n#top .hr.av-kqt9ln1w-f6affe7cdeee6be02fc225bbc4bc5689{\nmargin-top:15px;\nmargin-bottom:15px;\n}\n.hr.av-kqt9ln1w-f6affe7cdeee6be02fc225bbc4bc5689 .hr-inner{\nwidth:100%;\nborder-color:#d8d8d8;\n}\n<\/style>\n<div class=\"hr av-kqt9ln1w-f6affe7cdeee6be02fc225bbc4bc5689 hr-custom  avia-builder-el-10  el_after_av_textblock  el_before_av_three_fifth  hr-center hr-icon-no\"><span class=\"hr-inner inner-border-av-border-thin\"><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1wlhzr6-8cc129343b9618e21784b665a1361b31\">\n.flex_column.av-1wlhzr6-8cc129343b9618e21784b665a1361b31{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div class=\"flex_column av-1wlhzr6-8cc129343b9618e21784b665a1361b31 av_three_fifth  avia-builder-el-11  el_after_av_hr  el_before_av_two_fifth  first flex_column_div av-zero-column-padding  \"><section class=\"av_textblock_section av-kqt9tgn4-955ae44a3b12f5f76d41e08b4c147261 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><h3>Le magma en mouvement et les fluides volcaniques d&eacute;clenchent des s&eacute;ismes<\/h3>\n<p>De nombreux processus peuvent g&eacute;n&eacute;rer des <strong>s&eacute;ismes dans les terres volcaniques<\/strong>. La plupart du temps, ces processus sont des failles et des fractures qui ne conduisent pas n&eacute;cessairement &agrave; une &eacute;ruption. <strong>Les tremblements de terre volcaniques<\/strong> se produisent lorsque le <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>magma<\/a> et les gaz volcaniques remontent &agrave; la surface depuis les profondeurs du sous-sol, impliquant d&rsquo;importants changements de contraintes dans la <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;CRO&Ucirc;TE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;La cro&ucirc;te est la couche la plus ext&eacute;rieure majeure de la terre, allant d&amp;#039;environ 10 &agrave; 65 km d&amp;#039;&eacute;paisseur dans le monde entier. Les 15 &agrave; 35 km sup&eacute;rieurs de cro&ucirc;te sont suffisamment fragiles pour produire des tremblements de terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/croute-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>cro&ucirc;te<\/a> lors de la migration des mat&eacute;riaux vers le haut.<\/p>\n<\/div><\/section><br>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqta1i5b-a345f9d882c51d4089993cf6d16e9b60\">\n#top .hr.hr-invisible.av-kqta1i5b-a345f9d882c51d4089993cf6d16e9b60{\nheight:20px;\n}\n<\/style>\n<div class=\"hr av-kqta1i5b-a345f9d882c51d4089993cf6d16e9b60 hr-invisible  avia-builder-el-13  el_after_av_textblock  el_before_av_textblock \"><span class=\"hr-inner \"><span class=\"hr-inner-style\"><\/span><\/span><\/div><br>\n<section class=\"av_textblock_section av-kqtdsfvd-d152eb0e3d3e094fcc403a1e69a26b44 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><h3><a title=\"60% DES VOLCANS ACTIFS N'ONT PAS DE SYST&Egrave;ME DE SURVEILLANCE\" href=\"http:\/\/volcanx.cluster031.hosting.ovh.net\/most-of-active-volcanoes-have-no-monitoring-system\/\">Les sismologues des volcans &eacute;tudient<\/a> plusieurs types d&rsquo;&eacute;v&eacute;nements sismiques pour mieux comprendre comment le magma et les gaz se d&eacute;placent vers la surface:<\/h3>\n<\/div><\/section><br>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1auxuce-446d26f09781275ead180812c8c73cd6\">\n#top .hr.hr-invisible.av-1auxuce-446d26f09781275ead180812c8c73cd6{\nheight:20px;\n}\n<\/style>\n<div class=\"hr av-1auxuce-446d26f09781275ead180812c8c73cd6 hr-invisible  avia-builder-el-15  el_after_av_textblock  el_before_av_textblock \"><span class=\"hr-inner \"><span class=\"hr-inner-style\"><\/span><\/span><\/div><br>\n<section class=\"av_textblock_section av-kqtdv7q3-ddccd14f13f4a7f2a8db2af689b19cc8 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><p><strong>Les r&eacute;seaux de surveillance sismique<\/strong> des volcans sont tr&egrave;s h&eacute;t&eacute;rog&egrave;nes selon les pays et les volcans. Les s&eacute;ismes volcaniques se produisent lorsque le <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>magma<\/a> et les gaz volcaniques remontent &agrave; la surface depuis les profondeurs du sous-sol, entra&icirc;nant d&rsquo;importants changements de contraintes dans la <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;CRO&Ucirc;TE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;La cro&ucirc;te est la couche la plus ext&eacute;rieure majeure de la terre, allant d&amp;#039;environ 10 &agrave; 65 km d&amp;#039;&eacute;paisseur dans le monde entier. Les 15 &agrave; 35 km sup&eacute;rieurs de cro&ucirc;te sont suffisamment fragiles pour produire des tremblements de terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/croute-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>cro&ucirc;te<\/a>. Les s&eacute;ismes volcano-tectoniques (VT) repr&eacute;sentent une fracture fragile de la roche, le m&ecirc;me processus qui se produit le long des failles purement &laquo;&nbsp;tectoniques&nbsp;&raquo;.<br>\n1Sur les volcans, les <strong>s&eacute;ismes VT<\/strong> peuvent se produire en raison des forces tectoniques &laquo;&nbsp;normales&nbsp;&raquo;, des changements de contraintes caus&eacute;s par le <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>magma<\/a> en mouvement et du mouvement des fluides &agrave; travers des fissures pr&eacute;existantes. La distinction entre ces diff&eacute;rents processus peut s&rsquo;av&eacute;rer d&eacute;licate et n&eacute;cessite souvent des donn&eacute;es provenant d&rsquo;autres disciplines (g&eacute;od&eacute;sie, <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;HYDROLOGIE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;La science englobant le comportement de l&amp;#039;eau telle qu&amp;#039;elle se produit dans l&amp;#039;atmosph&egrave;re, &agrave; la surface du sol et sous terre.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/hydrologie-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">hydrologie<\/a>, g&eacute;ochimie des gaz et g&eacute;ologie)<br>\n2- <strong>Longue p&eacute;riode<\/strong> (LP) ou <strong>faible fr&eacute;quence<\/strong> (LF) <strong>s&eacute;ismes<\/strong> sont caus&eacute;s par des fissures qui r&eacute;sonnent lorsque le <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>magma<\/a> et les gaz se d&eacute;placent vers la surface. Ils sont souvent observ&eacute;s avant les &eacute;ruptions volcaniques, mais leur apparition fait &eacute;galement partie de la <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;SISMICIT&Eacute;&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Le ph&eacute;nom&egrave;ne des tremblements de terre caus&eacute;s par la fracturation fragile des roches dans la cro&ucirc;te terrestre. Synonyme d&amp;#039;activit&eacute; sismique.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/sismicite-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">sismicit&eacute;<\/a> de fond normale de certains volcans et leur apparition n&rsquo;indique pas n&eacute;cessairement qu&rsquo;une &eacute;ruption est imminente. Les &eacute;v&eacute;nements LF peuvent &eacute;galement &ecirc;tre produits par des processus non-magmatiques, notamment le mouvement des glaciers.<br>\n3-<strong>Le tremblement<\/strong> est un signal sismique continu de haute amplitude qui peut &ecirc;tre caus&eacute; par de multiples processus, y compris une r&eacute;sonance &agrave; longue dur&eacute;e de vie due &agrave; un mouvement prolong&eacute; du <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>magma<\/a> &agrave; travers les fissures, l&rsquo;occurrence continue d&rsquo;&eacute;v&eacute;nements VT ou LP\/LF qui sont si proches dans le temps qu&rsquo;ils ne peuvent &ecirc;tre s&eacute;par&eacute;s visuellement, et des explosions.<br>\n4- <strong>Les r&eacute;seaux sismiques de surface<\/strong> peuvent &ecirc;tre parasites ou utiles pour la surveillance. Les sources peuvent &ecirc;tre anthropiques, chutes de pierres, tremblements de glace, glissements de terrain, &eacute;coulements pyroclastiques et lahars, explosions.<\/p>\n<\/div><\/section><br>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-280wm6-7143270a863b5edf6aeeb91449c82f9d\">\n#top .hr.hr-invisible.av-280wm6-7143270a863b5edf6aeeb91449c82f9d{\nheight:10px;\n}\n<\/style>\n<div class=\"hr av-280wm6-7143270a863b5edf6aeeb91449c82f9d hr-invisible  avia-builder-el-17  el_after_av_textblock  el_before_av_textblock \"><span class=\"hr-inner \"><span class=\"hr-inner-style\"><\/span><\/span><\/div><br>\n<section class=\"av_textblock_section av-kqtdvi1g-d58b1510582040230a4a9aa8e33ee63c \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><p><strong><a title=\"BUILDING RISK KNOWLEDGE\" href=\"http:\/\/volcanx.cluster031.hosting.ovh.net\/building-risk-knowledge\/\">La mayor&iacute;a de los terremotos relacionados con los volcanes<\/a> son demasiado peque&ntilde;os para sentirlos<\/strong>, generalmente bastante superficiales (normalmente a menos de 10 km (7 mi) de la superficie), y pueden ocurrir en enjambres que consisten en docenas o cientos de eventos. La mayor&iacute;a de los enjambres no suelen provocar erupciones, pero la mayor&iacute;a de las erupciones van precedidas de enjambres. Por lo tanto, durante los per&iacute;odos de mayor actividad s&iacute;smica en un volc&aacute;n, los sism&oacute;logos trabajan las 24 horas del d&iacute;a para detectar variaciones sutiles en el tipo, la ubicaci&oacute;n y la intensidad de la actividad s&iacute;smica para determinar si puede producirse una erupci&oacute;n.<\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1iz7j36-2c9786a9f3f90bd1396461500bfb925f\">\n.flex_column.av-1iz7j36-2c9786a9f3f90bd1396461500bfb925f{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div class=\"flex_column av-1iz7j36-2c9786a9f3f90bd1396461500bfb925f av_two_fifth  avia-builder-el-19  el_after_av_three_fifth  avia-builder-el-last  flex_column_div av-zero-column-padding  \"><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqtcpnnn-e1c5f64b7aed9e62d3ba0fd1c13a0686\">\n.avia-image-container.av-kqtcpnnn-e1c5f64b7aed9e62d3ba0fd1c13a0686 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-kqtcpnnn-e1c5f64b7aed9e62d3ba0fd1c13a0686 .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<\/p><div class=\"avia-image-container av-kqtcpnnn-e1c5f64b7aed9e62d3ba0fd1c13a0686 av-styling- avia-align-center  avia-builder-el-20  el_before_av_textblock  avia-builder-el-first \" itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class=\"wp-image-11557 avia-img-lazy-loading-not-11557 avia_image \" src=\"https:\/\/volcanofoundation.org\/wp-content\/uploads\/2021\/07\/seismogrm-signal-volcanic-earthquakes.png\" alt=\"\" title=\"seismogrm-signal-volcanic-earthquakes\" height=\"1190\" width=\"1140\" itemprop=\"thumbnailUrl\" srcset=\"https:\/\/volcanofoundation.org\/wp-content\/uploads\/2021\/07\/seismogrm-signal-volcanic-earthquakes.png 1140w, https:\/\/volcanofoundation.org\/wp-content\/uploads\/2021\/07\/seismogrm-signal-volcanic-earthquakes-287x300.png 287w, https:\/\/volcanofoundation.org\/wp-content\/uploads\/2021\/07\/seismogrm-signal-volcanic-earthquakes-987x1030.png 987w, https:\/\/volcanofoundation.org\/wp-content\/uploads\/2021\/07\/seismogrm-signal-volcanic-earthquakes-768x802.png 768w, https:\/\/volcanofoundation.org\/wp-content\/uploads\/2021\/07\/seismogrm-signal-volcanic-earthquakes-675x705.png 675w\" sizes=\"(max-width: 1140px) 100vw, 1140px\"\/><\/div><\/div><\/div><br>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqtcpuh7-d8db4528b4900c045b62972c54904769\">\n#top .av_textblock_section.av-kqtcpuh7-d8db4528b4900c045b62972c54904769 .avia_textblock{\nfont-size:14px;\n}\n<\/style>\n<section class=\"av_textblock_section av-kqtcpuh7-d8db4528b4900c045b62972c54904769 \" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\"><div class=\"avia_textblock\" itemprop=\"text\"><p><em>Ejemplos de se&ntilde;ales de sismos volc&aacute;nicos: volcano tect&oacute;nico (VT), baja frecuencia (LF)\/largo per&iacute;odo profundo (DLP), h&iacute;brido (mezcla de VT y LF), muy baja frecuencia (VLF) y temblor.<\/em><\/p>\n<\/div><\/section><br>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-14hay76-b9bade6c53b94b7d00ae79f4a86820fd\">\n#top .hr.hr-invisible.av-14hay76-b9bade6c53b94b7d00ae79f4a86820fd{\nheight:30px;\n}\n<\/style>\n<div class=\"hr av-14hay76-b9bade6c53b94b7d00ae79f4a86820fd hr-invisible  avia-builder-el-22  el_after_av_textblock  avia-builder-el-last \"><span class=\"hr-inner \"><span class=\"hr-inner-style\"><\/span><\/span><\/div><\/div>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>The seismic sources of volcanoes are varied and complex. They involve interactions between <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">magma<\/a>, gaseous or liquid fluids and solids. These specialities make volcanic seismology a science in its own right.<\/p>\n","protected":false},"author":8,"featured_media":11142,"parent":11396,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-11552","page","type-page","status-publish","has-post-thumbnail","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/pages\/11552","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/comments?post=11552"}],"version-history":[{"count":0,"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/pages\/11552\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/pages\/11396"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/media\/11142"}],"wp:attachment":[{"href":"https:\/\/volcanofoundation.org\/fr\/wp-json\/wp\/v2\/media?parent=11552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}