{"id":507,"date":"2015-09-23T21:45:20","date_gmt":"2015-09-23T21:45:20","guid":{"rendered":"https:\/\/courses.candelalearning.com\/geophysical\/?post_type=chapter&#038;p=507"},"modified":"2017-04-19T22:05:53","modified_gmt":"2017-04-19T22:05:53","slug":"where-volcanoes-are-located","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/chapter\/where-volcanoes-are-located\/","title":{"raw":"Where Volcanoes Are Located","rendered":"Where Volcanoes Are Located"},"content":{"raw":"[caption id=\"\" align=\"alignnone\" width=\"500\"]<a href=\"http:\/\/earthobservatory.nasa.gov\/NaturalHazards\/view.php?id=16689\" target=\"_blank\"><img class=\"galleryImageBorder wsite-image\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152758\/6804410.jpg\" alt=\"Picture\" width=\"500\" \/><\/a> Google Earth image of Japan and the oceanic-to-oceanic subduction zones.[\/caption]\r\n<h2>Volcanos along Convergent Plate Boundaries<\/h2>\r\nVolcanoes are a vibrant manifestation of plate tectonics processes. Volcanoes are common along convergent and divergent plate boundaries, but are also found within lithospheric plates away from plate boundaries. Wherever mantle is able to melt, volcanoes may be the result.Volcanoes erupt because mantle rock melts. The first stage in creating a volcano is when mantle rock begins to melt because of extremely high temperatures, lithospheric pressure lowers, or water is added.Along subducting plate boundaries, the crust heats up as it sinks into the mantle. Also, ocean water is mixed in with the sediments lying on top of the subducting plate. This water lowers the melting point of the mantle material, which increases melting. Volcanoes at convergent plate boundaries are found all along the Pacific Ocean basin, primarily at the edges of the Pacific, Cocos, and Nazca plates.<a href=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/c\/cc\/2008_age_of_ocean_plates.png\" target=\"_blank\">\r\n<img src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152800\/440293144.png\" alt=\"Picture\" \/><\/a>\r\n\r\nLarge earthquakes are extremely common along convergent plate boundaries. Since the Pacific Ocean is rimmed by convergent and transform boundaries, about 80% of all earthquakes strike around the Pacific Ocean basin and is why the region is called the Ring of Fire. A description of the Pacific Ring of Fire along western North America is below:\r\n<ul>\r\n \t<li>Subduction at the Middle American Trench creates volcanoes in Central America.<\/li>\r\n \t<li>The San Andreas Fault is a transform boundary.<\/li>\r\n \t<li>Subduction of the Juan de Fuca plate beneath the North American plate creates the Cascade volcanoes like Mount St. Helens, Mount Rainer, Mount Hood and more.<\/li>\r\n \t<li>Subduction of the Pacific plate beneath the North American plate in the north creates the long chain of the Aleutian Islands volcanoes near Alaska.<\/li>\r\n<\/ul>\r\nThis incredible explosive eruption of\u00a0Mount Vesuvius\u00a0in Italy in A.D. 79 is an example of a composite volcano that forms as the result of a convergent plate boundary.\r\n\r\nhttps:\/\/youtu.be\/1u1Ys4m5zY4\r\n\r\n<a href=\"http:\/\/pubs.usgs.gov\/gip\/dynamic\/Vigil.html\" target=\"_blank\">\r\n<img src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152804\/638274413.gif\" alt=\"Picture\" \/><\/a>\r\n<h2>Volcanoes along Divergent Plate Boundaries<\/h2>\r\nWhy does melting occur at divergent plate boundaries? Hot mantle rock rises where the plates are\u00a0moving apart. This releases pressure on the mantle, which lowers its melting temperature allowing lava to erupt through long cracks or fissures. Scientists have captured incredible footage of \"Deepest Ocean Eruption Ever Filmed\" and other undersea volcanoes.\r\n\r\nhttps:\/\/youtu.be\/qgMhLRdek_w\r\n\r\nhttps:\/\/youtu.be\/WK_X7w2cXlM\r\n\r\n<img class=\"galleryImageBorder wsite-image alignright\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152805\/858116088.jpg\" alt=\"Picture\" \/>Volcanoes erupt at mid-ocean ridges, such as the Mid-Atlantic ridge, where seafloor spreading creates new seafloor in the rift valleys. Where a hotspot is located along the ridge, such as at Iceland, volcanoes grow high enough to create islands. Eruptions are found at divergent plate boundaries as continents break apart such as the East African Rift between the African and Arabian plates and the Great Basin and Range in the western United States. But those volcanoes of the ladder are now extinct.\r\n\r\nCheck out\u00a0some <a href=\"https:\/\/www.flickr.com\/photos\/stefnisson\/sets\/72157623892644702\/\" target=\"_blank\">dramatic time-lapsed photography of a volcanic eruption on Iceland<\/a>. Iceland is a hot spot volcano and the surface manifestation of the mid-Atlantic ridge.\r\n<h2>Volcanic Hotspots<\/h2>\r\nAlthough most volcanoes are found at convergent or divergent plate boundaries, intraplate volcanoes are found in the middle of a tectonic plate. The Hawaiian Islands are the exposed peaks of a great chain of volcanoes that lie on the Pacific plate. These islands are in the middle of the Pacific plate. The youngest island sits directly above a column of hot rock called a mantle plume. As the plume rises through the mantle, pressure is released and mantle melts to create a\u00a0<strong>hotspot<\/strong>.Earth is home to about 50 known hot spots. Most of these are in the oceans because they are better able to penetrate oceanic lithosphere to create volcanoes. The hotspots that are known beneath continents are extremely large, such as Yellowstone. The video on the right is of the hot spot beneath Hawaii, the origin of the voluminous lava produced by the shield volcano Kilauea.\u00a0There are several key indicators to determine a hot spot from island arc volcanoes. At island arcs, the volcanoes are all about the same age. By contrast, at hotspots the volcanoes are youngest at one end of the chain and oldest at the other.\r\n\r\n<img src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152806\/1313475_orig.jpg\" alt=\"Picture\" \/>\r\n\r\n<img src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152808\/3434292_orig.jpg\" alt=\"Picture\" \/>","rendered":"<div style=\"width: 510px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/earthobservatory.nasa.gov\/NaturalHazards\/view.php?id=16689\" target=\"_blank\"><img decoding=\"async\" class=\"galleryImageBorder wsite-image\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152758\/6804410.jpg\" alt=\"Picture\" width=\"500\" \/><\/a><\/p>\n<p class=\"wp-caption-text\">Google Earth image of Japan and the oceanic-to-oceanic subduction zones.<\/p>\n<\/div>\n<h2>Volcanos along Convergent Plate Boundaries<\/h2>\n<p>Volcanoes are a vibrant manifestation of plate tectonics processes. Volcanoes are common along convergent and divergent plate boundaries, but are also found within lithospheric plates away from plate boundaries. Wherever mantle is able to melt, volcanoes may be the result.Volcanoes erupt because mantle rock melts. The first stage in creating a volcano is when mantle rock begins to melt because of extremely high temperatures, lithospheric pressure lowers, or water is added.Along subducting plate boundaries, the crust heats up as it sinks into the mantle. Also, ocean water is mixed in with the sediments lying on top of the subducting plate. This water lowers the melting point of the mantle material, which increases melting. Volcanoes at convergent plate boundaries are found all along the Pacific Ocean basin, primarily at the edges of the Pacific, Cocos, and Nazca plates.<a href=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/c\/cc\/2008_age_of_ocean_plates.png\" target=\"_blank\"><br \/>\n<img decoding=\"async\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152800\/440293144.png\" alt=\"Picture\" \/><\/a><\/p>\n<p>Large earthquakes are extremely common along convergent plate boundaries. Since the Pacific Ocean is rimmed by convergent and transform boundaries, about 80% of all earthquakes strike around the Pacific Ocean basin and is why the region is called the Ring of Fire. A description of the Pacific Ring of Fire along western North America is below:<\/p>\n<ul>\n<li>Subduction at the Middle American Trench creates volcanoes in Central America.<\/li>\n<li>The San Andreas Fault is a transform boundary.<\/li>\n<li>Subduction of the Juan de Fuca plate beneath the North American plate creates the Cascade volcanoes like Mount St. Helens, Mount Rainer, Mount Hood and more.<\/li>\n<li>Subduction of the Pacific plate beneath the North American plate in the north creates the long chain of the Aleutian Islands volcanoes near Alaska.<\/li>\n<\/ul>\n<p>This incredible explosive eruption of\u00a0Mount Vesuvius\u00a0in Italy in A.D. 79 is an example of a composite volcano that forms as the result of a convergent plate boundary.<\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-1\" title=\"When Earth Erupts-Composite Volcanoes\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/1u1Ys4m5zY4?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p><a href=\"http:\/\/pubs.usgs.gov\/gip\/dynamic\/Vigil.html\" target=\"_blank\"><br \/>\n<img decoding=\"async\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152804\/638274413.gif\" alt=\"Picture\" \/><\/a><\/p>\n<h2>Volcanoes along Divergent Plate Boundaries<\/h2>\n<p>Why does melting occur at divergent plate boundaries? Hot mantle rock rises where the plates are\u00a0moving apart. This releases pressure on the mantle, which lowers its melting temperature allowing lava to erupt through long cracks or fissures. Scientists have captured incredible footage of &#8220;Deepest Ocean Eruption Ever Filmed&#8221; and other undersea volcanoes.<\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-2\" title=\"Deepest Ocean Eruption Filmed\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/qgMhLRdek_w?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-3\" title=\"Undersea Volcanoes | Planet Earth | BBC Earth\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/WK_X7w2cXlM?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p><img decoding=\"async\" class=\"galleryImageBorder wsite-image alignright\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152805\/858116088.jpg\" alt=\"Picture\" \/>Volcanoes erupt at mid-ocean ridges, such as the Mid-Atlantic ridge, where seafloor spreading creates new seafloor in the rift valleys. Where a hotspot is located along the ridge, such as at Iceland, volcanoes grow high enough to create islands. Eruptions are found at divergent plate boundaries as continents break apart such as the East African Rift between the African and Arabian plates and the Great Basin and Range in the western United States. But those volcanoes of the ladder are now extinct.<\/p>\n<p>Check out\u00a0some <a href=\"https:\/\/www.flickr.com\/photos\/stefnisson\/sets\/72157623892644702\/\" target=\"_blank\">dramatic time-lapsed photography of a volcanic eruption on Iceland<\/a>. Iceland is a hot spot volcano and the surface manifestation of the mid-Atlantic ridge.<\/p>\n<h2>Volcanic Hotspots<\/h2>\n<p>Although most volcanoes are found at convergent or divergent plate boundaries, intraplate volcanoes are found in the middle of a tectonic plate. The Hawaiian Islands are the exposed peaks of a great chain of volcanoes that lie on the Pacific plate. These islands are in the middle of the Pacific plate. The youngest island sits directly above a column of hot rock called a mantle plume. As the plume rises through the mantle, pressure is released and mantle melts to create a\u00a0<strong>hotspot<\/strong>.Earth is home to about 50 known hot spots. Most of these are in the oceans because they are better able to penetrate oceanic lithosphere to create volcanoes. The hotspots that are known beneath continents are extremely large, such as Yellowstone. The video on the right is of the hot spot beneath Hawaii, the origin of the voluminous lava produced by the shield volcano Kilauea.\u00a0There are several key indicators to determine a hot spot from island arc volcanoes. At island arcs, the volcanoes are all about the same age. By contrast, at hotspots the volcanoes are youngest at one end of the chain and oldest at the other.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152806\/1313475_orig.jpg\" alt=\"Picture\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/567\/2015\/05\/21152808\/3434292_orig.jpg\" alt=\"Picture\" \/><\/p>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-507\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>Dynamic Earth: Introduction to Physical Geography. <strong>Authored by<\/strong>: R. Adam Dastrup. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"http:\/\/www.opengeography.org\/physical-geography.html\">http:\/\/www.opengeography.org\/physical-geography.html<\/a>. <strong>Project<\/strong>: Open Geography Education. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/\">CC BY-SA: Attribution-ShareAlike<\/a><\/em><\/li><\/ul><div class=\"license-attribution-dropdown-subheading\">All rights reserved content<\/div><ul class=\"citation-list\"><li>When Earth Erupts-Composite Volcanoes. <strong>Authored by<\/strong>: webquestvideos. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/1u1Ys4m5zY4\">https:\/\/youtu.be\/1u1Ys4m5zY4<\/a>. <strong>License<\/strong>: <em>All Rights Reserved<\/em>. <strong>License Terms<\/strong>: Standard YouTube License<\/li><li>Deepest Ocean Eruption Filmed. <strong>Authored by<\/strong>: wrefai. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/qgMhLRdek_w\">https:\/\/youtu.be\/qgMhLRdek_w<\/a>. <strong>License<\/strong>: <em>All Rights Reserved<\/em>. <strong>License Terms<\/strong>: Standard YouTube License<\/li><li>Undersea Volcanoes - Planet Earth - BBC. <strong>Authored by<\/strong>: BBC Earth. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/WK_X7w2cXlM\">https:\/\/youtu.be\/WK_X7w2cXlM<\/a>. <strong>License<\/strong>: <em>All Rights Reserved<\/em>. <strong>License Terms<\/strong>: Standard YouTube License<\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":78,"menu_order":9,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc\",\"description\":\"Dynamic Earth: Introduction to Physical Geography\",\"author\":\"R. Adam Dastrup\",\"organization\":\"\",\"url\":\"http:\/\/www.opengeography.org\/physical-geography.html\",\"project\":\"Open Geography Education\",\"license\":\"cc-by-sa\",\"license_terms\":\"\"},{\"type\":\"copyrighted_video\",\"description\":\"When Earth Erupts-Composite Volcanoes\",\"author\":\"webquestvideos\",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/1u1Ys4m5zY4\",\"project\":\"\",\"license\":\"arr\",\"license_terms\":\"Standard YouTube License\"},{\"type\":\"copyrighted_video\",\"description\":\"Deepest Ocean Eruption Filmed\",\"author\":\"wrefai\",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/qgMhLRdek_w\",\"project\":\"\",\"license\":\"arr\",\"license_terms\":\"Standard YouTube License\"},{\"type\":\"copyrighted_video\",\"description\":\"Undersea Volcanoes - Planet Earth - BBC\",\"author\":\"BBC Earth\",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/WK_X7w2cXlM\",\"project\":\"\",\"license\":\"arr\",\"license_terms\":\"Standard YouTube License\"}]","CANDELA_OUTCOMES_GUID":"","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-507","chapter","type-chapter","status-publish","hentry"],"part":486,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/chapters\/507","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/wp\/v2\/users\/78"}],"version-history":[{"count":4,"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/chapters\/507\/revisions"}],"predecessor-version":[{"id":546,"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/chapters\/507\/revisions\/546"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/parts\/486"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/chapters\/507\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/wp\/v2\/media?parent=507"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/pressbooks\/v2\/chapter-type?post=507"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/wp\/v2\/contributor?post=507"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/suny-geophysical\/wp-json\/wp\/v2\/license?post=507"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}