{"id":126845,"date":"2026-09-30T13:23:21","date_gmt":"2026-09-30T07:53:21","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=126845"},"modified":"2026-09-30T13:23:21","modified_gmt":"2026-09-30T07:53:21","slug":"fukutoku-okanoba-volcano","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/fukutoku-okanoba-volcano\/","title":{"rendered":"Fukutoku-Okanoba Volcano"},"content":{"rendered":"<h2><b>Fukutoku-Okanoba Volcano Latest News<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Japan\u2019s Coast Guard recently reported signs of activity at the Fukutoku-Okanoba submarine volcano.\u00a0 <\/span><\/p>\n<h2><b>About Fukutoku-Okanoba Volcano<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It is an <\/span><b>active submarine volcano<\/b><span style=\"font-weight: 400;\"> that is part of the <\/span><b>Volcano Islands<\/b> <b>of Japan <\/b><span style=\"font-weight: 400;\">in the <\/span><b><a href=\"https:\/\/vajiramandravi.com\/current-affairs\/pacific-ocean\/\" target=\"_blank\">Pacific Ocean<\/a>.\u00a0\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It is part of the<\/span><b> Izu-Bonin arc <\/b><span style=\"font-weight: 400;\">formed by<\/span><b> subduction of the Pacific Plate beneath<\/b><span style=\"font-weight: 400;\"> the <\/span><b>Philippine Sea Plate.\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Its <\/span><b>summit <\/b><span style=\"font-weight: 400;\">is just <\/span><b>14 meters<\/b><span style=\"font-weight: 400;\"> (46 feet) <\/span><b>below sea level,<\/b><span style=\"font-weight: 400;\"> allowing <\/span><b>Surtseyan eruptions<\/b><span style=\"font-weight: 400;\"> to <\/span><b>breach the surface.\u00a0\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><b>Composition <\/b><span style=\"font-weight: 400;\">is <\/span><b>tholeiitic basalt<\/b><span style=\"font-weight: 400;\">, typical of arc front volcanism.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It <\/span><b>remains active<\/b><span style=\"font-weight: 400;\"> with intermittent submarine <\/span><b>eruptions and discoloured water<\/b><span style=\"font-weight: 400;\"> since 2013.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><b>Eruptions are explosive<\/b><span style=\"font-weight: 400;\"> with <\/span><b>pumice rafts, <\/b><span style=\"font-weight: 400;\">discoloured water, and <\/span><b>occasional ephemeral island formation.\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The <\/span><b>2021 eruption<\/b><span style=\"font-weight: 400;\"> produced <\/span><b>massive pumice rafts<\/b><span style=\"font-weight: 400;\"> that <\/span><b>drifted thousands of kilometres <\/b><span style=\"font-weight: 400;\">across the Pacific, impacting shipping and beaches.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The volcano&#8217;s<\/span><b> frequent activity and shallow depth<\/b><span style=\"font-weight: 400;\"> make it one of the most dynamic submarines, with eruptions often detected by satellite discoloration.\u00a0\u00a0<\/span><\/li>\n<\/ul>\n<h2><b>What is a Surtseyan Eruption?<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It is a type of <\/span><b><a href=\"https:\/\/vajiramandravi.com\/current-affairs\/volcanism\/\" target=\"_blank\">volcanic<\/a> eruption<\/b><span style=\"font-weight: 400;\"> that takes place in <\/span><b>shallow seas or lakes.\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It is named after the island of Surtsey off the southern coast of Iceland.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When <\/span><b>magma rises <\/b><span style=\"font-weight: 400;\">close to the<\/span> <span style=\"font-weight: 400;\">surface of the water, it can come into <\/span><b>contact with the water<\/b><span style=\"font-weight: 400;\"> and <\/span><b>cause it to flash to steam.\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The sudden increase in<\/span><b> volume of the steam <\/b><span style=\"font-weight: 400;\">can <\/span><b>cause an explosion<\/b><span style=\"font-weight: 400;\">, which can <\/span><b>fragment <\/b><span style=\"font-weight: 400;\">the <\/span><b>magma into small pieces.\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><b>These pieces<\/b><span style=\"font-weight: 400;\"> of magma, called <\/span><b>tephra<\/b><span style=\"font-weight: 400;\">, can be <\/span><b>ejected into the air,<\/b><span style=\"font-weight: 400;\"> forming an <\/span><b>ash column.\u00a0<\/b><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">These eruptions are commonly <\/span><b>phreatomagmatic eruptions<\/b><span style=\"font-weight: 400;\">, representing <\/span><b>violent explosions <\/b><span style=\"font-weight: 400;\">caused by rising basaltic or andesitic magma coming into contact with abundant, shallow groundwater or surface water.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><b>Tuff rings, pyroclastic cones<\/b><span style=\"font-weight: 400;\"> of primarily ash, are built by explosive disruption of rapidly cooled magma.<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Surtseyan eruptions are <\/span><b>relatively common<\/b><span style=\"font-weight: 400;\">, and they can be found all over the world.\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Surtseyan eruptions can be very <\/span><b>dangerous<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"2\"><span style=\"font-weight: 400;\">The <\/span><b>ash and rock fragments<\/b><span style=\"font-weight: 400;\"> that are ejected into the air can <\/span><b>travel long distances,<\/b><span style=\"font-weight: 400;\"> and they can be a hazard to ships and aircraft.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400; text-align: justify;\" aria-level=\"2\"><span style=\"font-weight: 400;\">The <\/span><b>sudden expansion of steam<\/b><span style=\"font-weight: 400;\"> can also <\/span><b>cause shock waves,<\/b><span style=\"font-weight: 400;\"> which can damage buildings and other structures. <\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><b>News: <\/b><a href=\"https:\/\/www.reutersconnect.com\/item\/japan-detects-signs-of-activity-at-fukutoku-okanoba-submarine-volcano\/dGFnOnJldXRlcnMuY29tLDIwMjY6bmV3c21sX09XQU5BQ0FBVklERU8yMDI2MDkyOTQyNjAwNDcx\" target=\"_blank\" rel=\"nofollow noopener\"><b>REUT<\/b><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fukutoku-Okanoba Volcano is an active submarine volcano that is part of the Volcano Islands of Japan in the Pacific Ocean. Read more about Fukutoku-Okanoba Volcano, Location, Eruption, Latest News.<\/p>\n","protected":false},"author":23,"featured_media":126911,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[10586],"class_list":["post-126845","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-prelims-current-affairs","tag-fukutoku-okanoba-volcano","no-featured-image-padding"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/126845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/23"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=126845"}],"version-history":[{"count":4,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/126845\/revisions"}],"predecessor-version":[{"id":126944,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/126845\/revisions\/126944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/126911"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=126845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=126845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=126845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}