{"id":121519,"date":"2026-08-29T10:44:15","date_gmt":"2026-08-29T05:14:15","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=121519"},"modified":"2026-08-29T10:44:15","modified_gmt":"2026-08-29T05:14:15","slug":"glacial-collapse","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/glacial-collapse\/","title":{"rendered":"Glacial Collapse: The Science Behind the Nepal-Tibet Floods"},"content":{"rendered":"<h2><b>Glacial Collapse Latest News<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flash floods devastated Nepal&#8217;s Rasuwa district and parts of Tibet this week. Officials initially suspected an earthquake. Experts and the US Geological Survey later confirmed the <\/span><b>seismic signal was a result of a glacial collapse<\/b><span style=\"font-weight: 400;\"> \u2014 not its cause.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This raised a key question: what exactly is a glacial collapse, and how frequent are such events?<\/span><\/li>\n<\/ul>\n<h2><b>What Is a Glacial Collapse?<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A glacial collapse is the <\/span><b>sudden detachment<\/b><span style=\"font-weight: 400;\"> of a large mass of <\/span><b>ice, rock, and water<\/b><span style=\"font-weight: 400;\"> from a glacier.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It occurs on steep mountain slopes. Sometimes millions of cubic metres of material break away. This mass can transform into a fast-moving, ice-rich avalanche or debris flow.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The term is not a formal scientific definition in glaciology. It is, however, widely used to describe such events.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The journal Earth System Science Data describes this broader category as <\/span><b>gravity-driven failures of glacier ice<\/b><span style=\"font-weight: 400;\">. It includes ice avalanches, glacier detachments, and rock-ice avalanches.<\/span><\/li>\n<\/ul>\n<h2><b>How a Glacier Forms and Collapses<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A glacier forms when <\/span><b>snow builds up and survives<\/b><span style=\"font-weight: 400;\"> several melting seasons. These layers compress into <\/span><b>firn<\/b><span style=\"font-weight: 400;\"> \u2014 a stage between fresh snow and solid glacial ice. Over time, firn recrystallises into ice, becoming part of the glacier.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the glacial mass grows heavy enough, it begins to flow outward. Steep mountain gradients cause this outward flow, which can trigger collapse.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Warming temperatures add to the risk. Melted water collects in channels beneath the glacier. When the glacier&#8217;s lower portion collapses, these channels open suddenly, releasing water in large volumes.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As the ice mass moves over uneven terrain, stress builds up. This stress can exceed the ice&#8217;s structural strength, causing fractures.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Surface melting<\/b><span style=\"font-weight: 400;\"> adds further weakness: water seeps into cracks, and repeated freeze-thaw cycles force these cracks apart until the ice splits through.<\/span><\/li>\n<\/ul>\n<h2><b>Role of the Glacier&#8217;s Base<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">What lies beneath a glacier also matters. Many Himalayan glaciers <\/span><b>rest on soft mud<\/b><span style=\"font-weight: 400;\"> or clay \u2014 known as &#8220;<\/span><b><i>wet-base&#8221; glaciers<\/i><\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In these cases, water collects in large quantities at the glacier&#8217;s base, sometimes connected through internal tunnels.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When such glaciers collapse, the <\/span><b>sudden rush of water mixes with loose dirt, rock, and riverbed material<\/b><span style=\"font-weight: 400;\">. This debris-laden torrent can race down narrow valleys at very high speed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Collapsed ice and rock can also block river channels, forming <\/span><b>temporary natural dams<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When such dams break under pressure, they trigger a second wave of flooding \u2014 exactly what happened in Nepal this week.<\/span><\/li>\n<\/ul>\n<h2><b>How Common Are Glacial Collapses?<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Glacial collapses remain rare and highly unusual, according to scientists and geologists.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Only a handful of such events have been documented over the past decade \u2014 though Tibet has emerged as a hotspot for some of the world&#8217;s largest recorded cases.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Notable past instances include:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>July 2016, Aru Range, Tibet:<\/b><span style=\"font-weight: 400;\"> A valley glacier&#8217;s lower section detached, releasing about 68 million cubic metres of ice and killing nine herders and hundreds of animals. A nearby glacier collapsed two months later, releasing about 83 million cubic metres \u2014 NASA called it a rare occurrence.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>2018, Sedongpu Basin, Tibet:<\/b><span style=\"font-weight: 400;\"> Two ice-rock avalanches spilled debris into the <strong><a href=\"https:\/\/vajiramandravi.com\/current-affairs\/brahmaputra-river-system\/\" target=\"_blank\">Yarlung Tsangpo River<\/a><\/strong> (upper Brahmaputra), blocking it and forming a dangerous temporary lake.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>November 2022, Bukadaban Feng glacier, Kunlun Mountains:<\/b><span style=\"font-weight: 400;\"> About 40 million cubic metres of ice detached, crashing into a lake below and creating a 13-metre wave. It went unnoticed initially due to the remote location.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>2018, Ronti Peak, Uttarakhand, India:<\/b><span style=\"font-weight: 400;\"> About 27 million cubic metres of rock and glacier ice collapsed, killing over 200 people \u2014 though this was classified more as a rock avalanche coupled with ice.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>May 2025, Blatten, Switzerland:<\/b><span style=\"font-weight: 400;\"> A cascade of rock, soil, and ice buried much of the village. Experts linked the collapse to climate change in the Alps.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><b>The Climate Change Question<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Experts noted that climate change in the Himalayas shows increased heatwaves, glacial retreat, and permafrost reduction \u2014 all of which can drive landslides and glacial outburst floods.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Glaciers across the Hindu Kush Himalaya region \u2014 spanning Afghanistan, Bangladesh, Bhutan, China, India, Myanmar, Nepal, and Pakistan \u2014 lost ice 65% faster between 2011-2020 than in the previous decade.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nepal&#8217;s glaciers alone have lost nearly one-third of their ice volume over roughly three decades, according to a 2023 UN assessment.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hydrologists flagged a critical warning-system challenge: the absence of rainfall before such events defeat most operational flood warning systems, which typically rely on precipitation data.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">By the time a mud flow becomes visible, it is often too late to escape \u2014 the fast-moving mixture behaves &#8220;like liquid concrete.&#8221;<\/span><\/li>\n<\/ul>\n<h2><b>Conclusion<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Glacial collapses remain rare geological events, but their consequences can be catastrophic \u2014 as seen in the Nepal-Tibet floods.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">While scientists resist attributing any single event directly to climate change, the broader pattern of accelerated Himalayan glacial melt raises the risk of such collapses recurring.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This underscores the urgent need for improved seismic and satellite monitoring, early-warning systems attuned to non-rainfall triggers, and greater regional cooperation to protect downstream communities.<\/span><\/li>\n<\/ul>\n<p><b>Source:<\/b> <strong><a href=\"https:\/\/indianexpress.com\/article\/explained\/nepal-flash-floods-glacier-collapse-happen-10853905\/\" target=\"_blank\" rel=\"nofollow noopener\">IE<\/a> | <a href=\"https:\/\/www.aljazeera.com\/features\/2026\/8\/27\/nepal-tibet-floods-what-is-a-glacial-collapse-how-common-is-it\" target=\"_blank\" rel=\"nofollow noopener\">AJ<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Glacial Collapse can trigger catastrophic floods through sudden ice, rock and water release. Learn how glaciers collapse, why events occur and their climate risks.<\/p>\n","protected":false},"author":18,"featured_media":121530,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[9854,60,22,59],"class_list":["post-121519","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-mains-current-affairs","tag-glacial-collapse","tag-mains-articles","tag-upsc-current-affairs","tag-upsc-mains-current-affairs-tag","no-featured-image-padding"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/121519","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\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=121519"}],"version-history":[{"count":4,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/121519\/revisions"}],"predecessor-version":[{"id":121534,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/121519\/revisions\/121534"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/121530"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=121519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=121519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=121519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}