{"id":60174,"date":"2025-11-29T18:54:20","date_gmt":"2025-11-29T13:24:20","guid":{"rendered":"https:\/\/www.nextias.com\/ca\/?p=60174"},"modified":"2025-12-01T14:58:33","modified_gmt":"2025-12-01T09:28:33","slug":"indias-updated-seismic-zonation-map-2025","status":"publish","type":"post","link":"https:\/\/www.nextias.com\/ca\/current-affairs\/29-11-2025\/indias-updated-seismic-zonation-map-2025","title":{"rendered":"India\u2019s Updated Seismic Zonation Map (2025)"},"content":{"rendered":"\n<p><strong>Syllabus: GS3\/ Disaster Management<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>In News<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>India has released an updated seismic zonation map under the <strong>new Earthquake Design Code (2025).&nbsp;<\/strong>\n<ul class=\"wp-block-list\">\n<li>This revision aims to align <strong>India\u2019s seismic safety standards with modern scientific understanding<\/strong>, replacing the <strong>outdated 2016 map<\/strong> and historical-epicentre-based models.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Need For Upgradation<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Earlier Maps Underestimated Himalayan Risk: <\/strong>Previous zonation divided the Himalaya into Zones IV and V, despite the belt sharing one of the world\u2019s most active tectonic systems.<\/li>\n\n\n\n<li><strong>Outdated Methodology: <\/strong>Older models relied heavily on known past earthquake locations, magnitudes, broad geology, soil types &amp; historical damage patterns.<\/li>\n\n\n\n<li><strong>Underestimation of Rupture Propagation:<\/strong> Earlier maps did not adequately account for southward propagation of Himalayan Frontal Thrust ruptures\n<ul class=\"wp-block-list\">\n<li>Populated foothill regions like <strong>Dehradun (near Mohand)<\/strong> faced underestimated risk despite proximity to major thrust faults.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Growing Exposure and Vulnerability:<\/strong> Nearly three-fourths of India&#8217;s population now resides in seismically active areas.<\/li>\n\n\n\n<li><strong>Gap with International Best Practices: <\/strong>Need to adopt internationally accepted Probabilistic Seismic Hazard Assessment (PSHA) methods.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img data-dominant-color=\"e2d3be\" data-has-transparency=\"false\" loading=\"lazy\" decoding=\"async\" width=\"710\" height=\"1024\" src=\"https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/Indias-Updated-Seismic-Zonation-Map-2025-710x1024.webp\" alt=\"\" class=\"not-transparent wp-image-60186\" style=\"--dominant-color: #e2d3be; width:570px;height:auto\" srcset=\"https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/Indias-Updated-Seismic-Zonation-Map-2025-710x1024.webp 710w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/Indias-Updated-Seismic-Zonation-Map-2025-208x300.webp 208w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/Indias-Updated-Seismic-Zonation-Map-2025-768x1108.webp 768w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/Indias-Updated-Seismic-Zonation-Map-2025-1064x1536.webp 1064w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/Indias-Updated-Seismic-Zonation-Map-2025.webp 1419w\" sizes=\"auto, (max-width: 710px) 100vw, 710px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>What is a Seismic Zonation Map?<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A seismic zonation map is a scientific representation that<strong> divides a geographical area into zones<\/strong> based on the intensity and frequency of earthquakes expected in different regions.<\/li>\n\n\n\n<li>It is published by the <strong>Bureau of Indian Standards (BIS)<\/strong> &amp; integrated into the <strong>Earthquake Design Code (IS 1893).<\/strong><\/li>\n\n\n\n<li>It serves as a foundational tool for <strong>urban planning, risk assessment &amp; disaster preparedness.&nbsp;<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Key Features of the New Seismic Map (2025)<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Introduction of Zone VI:&nbsp;<\/strong>\n<ul class=\"wp-block-list\">\n<li>The entire <strong>Himalayan arc (Jammu &amp; Kashmir-Ladakh to Arunachal Pradesh) <\/strong>is now classified under the newly created highest-risk Zone VI.<\/li>\n\n\n\n<li>Recognizes consistent, extreme tectonic stress along the <strong>Indian-Eurasian plate boundary.<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Scientific Methodology &#8211; PSHA:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Built using internationally accepted <strong>Probabilistic Seismic Hazard Assessment (PSHA) methods.<\/strong><\/li>\n\n\n\n<li>Considers ground shaking attenuation with distance, tectonic regime, and underlying lithology.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Enhanced Geographic Coverage:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>61% of India&#8217;s landmass <\/strong>now classified under moderate to high hazard zones (increased from 59%).<\/li>\n\n\n\n<li>The southern peninsula shows minor refinements with a broadly stable hazard profile due to relatively stable tectonic behavior.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Boundary Rule Enhancement:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Towns situated along boundaries separating two zones will automatically be placed in the higher-risk zone.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Comprehensive Non-Structural Elements Safety:&nbsp;<\/strong>\n<ul class=\"wp-block-list\">\n<li>First-time focused attention on non-structural components like parapets, ceilings, overhead tanks, fa\u00e7ade panels, electrical lines, lifts, and suspended fixtures.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img data-dominant-color=\"dbdbdb\" data-has-transparency=\"false\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"636\" src=\"https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/fault-lines-1024x636.webp\" alt=\"\" class=\"not-transparent wp-image-60234\" style=\"--dominant-color: #dbdbdb; width:628px;height:auto\" srcset=\"https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/fault-lines-1024x636.webp 1024w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/fault-lines-300x186.webp 300w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/fault-lines-768x477.webp 768w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/fault-lines-1536x953.webp 1536w, https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2025\/11\/fault-lines.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Near-Fault Provisions:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Structural design must consider severe pulse-like ground motions for buildings close to active faults<\/li>\n\n\n\n<li>Updated limits on displacement, ductility, and energy dissipation.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Site-Specific Requirements:&nbsp;<\/strong>\n<ul class=\"wp-block-list\">\n<li>New provisions addressing liquefaction risks, soil flexibility, and site-specific response spectra.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Critical Infrastructure Standards:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Hospitals, schools, bridges, pipelines, and major public buildings must remain functional after major earthquakes.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Challenges in Implementation<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Retrofitting Legacy Infrastructure: <\/strong>High costs of retrofitting, technical complexity &amp; coordination challenges across multiple jurisdictions.<\/li>\n\n\n\n<li><strong>Economic Burden:<\/strong> Higher construction costs due to stricter standards.<\/li>\n\n\n\n<li><strong>Geotechnical Investigation Requirements:<\/strong> Site-specific assessments require specialized expertise and equipment.<\/li>\n<\/ul>\n\n\n\n<p>Source: TOI<\/p>\n","protected":false},"excerpt":{"rendered":"<p><strong>In News<\/strong><\/p>\n<li class=\"ms-5\">India has released an updated seismic zonation map under the new Earthquake Design Code (2025).\u00a0<\/li>\n<p><\/p>\n<p><strong>Need For Upgradation<\/strong><\/p>\n<li class=\"ms-5\">Earlier Maps Underestimated Himalayan Risk: Previous zonation divided the Himalaya into Zones IV and V, despite the belt sharing one of the world\u2019s most active tectonic systems.<\/li>\n<li class=\"ms-5\">Outdated Methodology: Older models relied heavily on known past earthquake locations, magnitudes, broad geology, soil types &#038; historical damage patterns.<\/li>\n<li class=\"ms-5\">Underestimation of Rupture Propagation: Earlier maps did not adequately account for southward propagation of Himalayan Frontal Thrust ruptures<\/li>\n<li class=\"ms-5\">Populated foothill regions like Dehradun (near Mohand) faced underestimated risk despite proximity to major thrust faults.<\/li>\n<p><a href=\"https:\/\/www.nextias.com\/ca\/current-affairs\/29-11-2025\/indias-updated-seismic-zonation-map-2025\" class=\"btn btn-primary btn-sm float-end\">Read\u00a0More<\/a><\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21],"tags":[],"class_list":["post-60174","post","type-post","status-publish","format-standard","hentry","category-current-affairs"],"acf":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/60174","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/comments?post=60174"}],"version-history":[{"count":4,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/60174\/revisions"}],"predecessor-version":[{"id":60235,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/60174\/revisions\/60235"}],"wp:attachment":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/media?parent=60174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/categories?post=60174"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/tags?post=60174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}