There is an interesting video on Youtube<\/a> from Paglajhora showing the collapse of a section of road:<\/p>\n <\/p>\n<\/iframe><\/p>\n<p>.<\/p>\n<p>Whilst this is not a new video (the accompanying text indicates that it occurred on 15th July 2010), I don’t think I’ve seen it before.\u00a0 The landslide apparently occurred at Paglajhora, on the Hill Cart Road connecting Siliguri and Kurseong in Darjeeling, northern India.<\/p>\n<p>Paglajhora is described in a paper (Sarkar 2011) that is<a href=\"http:\/\/rcin.org.pl\/igipz\/Content\/2334\/WA51_13866_r2011-vol84-z2_Geographia-Pol-sark.pdf\"> available online<\/a> (NB PDF).\u00a0 This section of the Shiv Khola river is, according to Sarkar (2011):<\/p>\n<blockquote><p>“notorious for its slump\/subsidence history that was initiated during the 1950 landslips in Darjeeling Hills…Since 1980, the incidences of slumping have become regular phenomenon, and by 1990 the Paglajhora slumps caused complete disruption of transportation and communication.\u00a0 The situation has deteriorated further in recent years”<\/p><\/blockquote>\n<p>The Paglajhora area is shown in the Google Earth image below; the yellow line is the Hill Cart Road:<\/p>\n<div id=\"attachment_14675\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-1-e1424331629154.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14675\" class=\"size-full wp-image-14675\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-1-e1424331629154.jpg\" alt=\"Paglajhora\" width=\"640\" height=\"420\" \/><\/a><p id=\"caption-attachment-14675\" class=\"wp-caption-text\">Google Earth perspective view of the Paglajhora area<\/p><\/div>\n<p>.<\/p>\n<p>The very extensive mass movement problem on this section of road is very clear, and indeed a closer view gives a better perspective on the serious nature of the problem at Paglajhora:<\/p>\n<p> <\/p>\n<div id=\"attachment_14676\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-2-e1424331832964.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14676\" class=\"size-full wp-image-14676\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-2-e1424331832964.jpg\" alt=\"Paglajhora\" width=\"640\" height=\"413\" \/><\/a><p id=\"caption-attachment-14676\" class=\"wp-caption-text\">Google Earth perspective view of Paglajhora in 2014<\/p><\/div>\n<p>.<\/p>\n<p>Sarkar (2011) suggests that the landslide problem at Paglajhora is the result of very weak colluvial materials, the origin of which is attributed to much older and much larger landslides.\u00a0 The nature of these postulated landslides is intriguing and deserves further study.\u00a0 These deposits were then reactivated by low quality construction and maintenance of the road and railway line, with poor management of the slope continuing to play a major role in the problems.\u00a0 The image above, from April 2014, suggests that the problem is not going to get better soon without proper management, and indeed the inevitable retrogression of the crown of the landslide is going to threaten settlements upslope soon.\u00a0 Perhaps the most shocking aspect of this is a comparison with the Google Earth image from January 2003:<\/p>\n<div id=\"attachment_14677\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-3-e1424332688590.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14677\" class=\"size-full wp-image-14677\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-3-e1424332688590.jpg\" alt=\"Paglajhora\" width=\"640\" height=\"396\" \/><\/a><p id=\"caption-attachment-14677\" class=\"wp-caption-text\">Google Earth perspective view of Paglajhora in 2003<\/p><\/div>\n<p>.<\/p>\n<p>The deterioration of the stability of the site in 12 years is remarkable.\u00a0 The morphology of the slopes in the 2003 image above would ring alarm bells to any competent geomorphologist or engineering geologist, and with good slope management it should have been possible to prevent this slope problem from developing.\u00a0 But, now that the instability has been initiated it will be extremely difficult, and expensive, to stop.<\/p>\n<h5>Reference<\/h5>\n<p>Sarkar, S. 2011.\u00a0 Evolution of the Paglajhora slump valley in the Shiv Khola Basin, the Darjeeling Himalaya, India.\u00a0 <em>Geographia Polonica<\/em>, <strong>84<\/strong> (2), 117-126.<\/p>\n<p> <\/p>\n<p> <\/p>\n<p> <\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>A video on Youtube shows a road collapse event that destroyed a truck at Paglajhora in Darjeeling. The landslide was a part of a much larger and very active slope failure that seems to have been initiated and exacerbated by poor slope management practices<!-- AddThis Advanced Settings generic via filter on wp_trim_excerpt --><!-- AddThis Share Buttons generic via filter on wp_trim_excerpt --><\/p>\n","protected":false},"author":22,"featured_media":14676,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3],"tags":[838,207,469,18,5,959,963,27],"class_list":["post-14672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-colluvium","tag-darjeeling","tag-featured","tag-himalayas","tag-india","tag-landslide-report","tag-landslide-video","tag-road"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/14672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/comments?post=14672"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/14672\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/14676"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=14672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=14672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=14672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
<\/p>\n
<\/iframe><\/p>\n<p>.<\/p>\n<p>Whilst this is not a new video (the accompanying text indicates that it occurred on 15th July 2010), I don’t think I’ve seen it before.\u00a0 The landslide apparently occurred at Paglajhora, on the Hill Cart Road connecting Siliguri and Kurseong in Darjeeling, northern India.<\/p>\n<p>Paglajhora is described in a paper (Sarkar 2011) that is<a href=\"http:\/\/rcin.org.pl\/igipz\/Content\/2334\/WA51_13866_r2011-vol84-z2_Geographia-Pol-sark.pdf\"> available online<\/a> (NB PDF).\u00a0 This section of the Shiv Khola river is, according to Sarkar (2011):<\/p>\n<blockquote><p>“notorious for its slump\/subsidence history that was initiated during the 1950 landslips in Darjeeling Hills…Since 1980, the incidences of slumping have become regular phenomenon, and by 1990 the Paglajhora slumps caused complete disruption of transportation and communication.\u00a0 The situation has deteriorated further in recent years”<\/p><\/blockquote>\n<p>The Paglajhora area is shown in the Google Earth image below; the yellow line is the Hill Cart Road:<\/p>\n<div id=\"attachment_14675\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-1-e1424331629154.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14675\" class=\"size-full wp-image-14675\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-1-e1424331629154.jpg\" alt=\"Paglajhora\" width=\"640\" height=\"420\" \/><\/a><p id=\"caption-attachment-14675\" class=\"wp-caption-text\">Google Earth perspective view of the Paglajhora area<\/p><\/div>\n<p>.<\/p>\n<p>The very extensive mass movement problem on this section of road is very clear, and indeed a closer view gives a better perspective on the serious nature of the problem at Paglajhora:<\/p>\n<p> <\/p>\n<div id=\"attachment_14676\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-2-e1424331832964.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14676\" class=\"size-full wp-image-14676\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-2-e1424331832964.jpg\" alt=\"Paglajhora\" width=\"640\" height=\"413\" \/><\/a><p id=\"caption-attachment-14676\" class=\"wp-caption-text\">Google Earth perspective view of Paglajhora in 2014<\/p><\/div>\n<p>.<\/p>\n<p>Sarkar (2011) suggests that the landslide problem at Paglajhora is the result of very weak colluvial materials, the origin of which is attributed to much older and much larger landslides.\u00a0 The nature of these postulated landslides is intriguing and deserves further study.\u00a0 These deposits were then reactivated by low quality construction and maintenance of the road and railway line, with poor management of the slope continuing to play a major role in the problems.\u00a0 The image above, from April 2014, suggests that the problem is not going to get better soon without proper management, and indeed the inevitable retrogression of the crown of the landslide is going to threaten settlements upslope soon.\u00a0 Perhaps the most shocking aspect of this is a comparison with the Google Earth image from January 2003:<\/p>\n<div id=\"attachment_14677\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-3-e1424332688590.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14677\" class=\"size-full wp-image-14677\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/02\/15_02-Paglajhora-3-e1424332688590.jpg\" alt=\"Paglajhora\" width=\"640\" height=\"396\" \/><\/a><p id=\"caption-attachment-14677\" class=\"wp-caption-text\">Google Earth perspective view of Paglajhora in 2003<\/p><\/div>\n<p>.<\/p>\n<p>The deterioration of the stability of the site in 12 years is remarkable.\u00a0 The morphology of the slopes in the 2003 image above would ring alarm bells to any competent geomorphologist or engineering geologist, and with good slope management it should have been possible to prevent this slope problem from developing.\u00a0 But, now that the instability has been initiated it will be extremely difficult, and expensive, to stop.<\/p>\n<h5>Reference<\/h5>\n<p>Sarkar, S. 2011.\u00a0 Evolution of the Paglajhora slump valley in the Shiv Khola Basin, the Darjeeling Himalaya, India.\u00a0 <em>Geographia Polonica<\/em>, <strong>84<\/strong> (2), 117-126.<\/p>\n<p> <\/p>\n<p> <\/p>\n<p> <\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>A video on Youtube shows a road collapse event that destroyed a truck at Paglajhora in Darjeeling. The landslide was a part of a much larger and very active slope failure that seems to have been initiated and exacerbated by poor slope management practices<!-- AddThis Advanced Settings generic via filter on wp_trim_excerpt --><!-- AddThis Share Buttons generic via filter on wp_trim_excerpt --><\/p>\n","protected":false},"author":22,"featured_media":14676,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3],"tags":[838,207,469,18,5,959,963,27],"class_list":["post-14672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-colluvium","tag-darjeeling","tag-featured","tag-himalayas","tag-india","tag-landslide-report","tag-landslide-video","tag-road"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/14672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/comments?post=14672"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/14672\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/14676"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=14672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=14672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=14672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}