{"id":39252,"date":"2021-10-13T06:33:52","date_gmt":"2021-10-13T06:33:52","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=39252"},"modified":"2021-10-13T06:33:52","modified_gmt":"2021-10-13T06:33:52","slug":"the-chgega-landslide-in-tunisia","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/10\/13\/the-chgega-landslide-in-tunisia\/","title":{"rendered":"The Chgega landslide in Tunisia"},"content":{"rendered":"

The Chgega landslide in Tunisia<\/h4>\n

The Chgega landslide is an interesting and unusual slope failure located close to the village of Tahint in the Mateur region of northern Tunisia (36.901, 9.521 is the location – it is very clearly visible on Google Earth).\u00a0 Every landslide is of course unique, but this one is quite unusual.\u00a0 The landslide is described in an article in the journal Remote Sensing<\/em> (Gaidi et al.<\/em> 2021<\/a>), in which the authors have used a variety of remote sensing methods to examine its movement.\u00a0 There is also a short summary on the Terradue website<\/a>, which includes this image:-<\/p>\n

\"Aerial

Aerial image of the Chgega landslide in Tunisia. Image posted on the Terradue website.<\/a><\/p><\/div>\n

.<\/p>\n

The landslide consists of a block of limestone that is 900 metres long and 400 metres wide sliding over a lower layer of clays and marls.\u00a0 The hill has a peak of 553 m asl, whilst the toe of the landslide is at about 395 m asl, giving a vertical extent for the Chgega landslide of about 160 m.\u00a0 The landslide is characterised by a rear scarp in the form of a huge graben, which is about 800 m long and up to 120 m wide.<\/p>\n

This area of Tunisia is subject to active tectonic deformation, and as a result has a significant level of seismic hazard.\u00a0 Documented earthquakes in this area of Tunisia include major events in 410 AD and 856 AD.\u00a0 Thus, it is possible that the landslide was initiated by, and indeed principally moves during, earthquakes.<\/p>\n

In their research, Gaidi et al.<\/em> (2021)<\/a> used a combination of INSAR and photogrammetry to measure the annual movement of the Chgega landslide.\u00a0 They concluded that over 4.7 years it moved a total of about 1 cm.\u00a0 Thus, this is a landslide that in asiesmic conditions is undergoing very slow creep type movements.<\/p>\n

The Chgega landslide is a beautiful example of a spreading type of landslide.\u00a0 It’s accessibility means that it is worthy of further investigation.\u00a0 I shall certainly be adding it to my bucket list of places to visit when I retire.<\/p>\n

.<\/p>\n

Reference<\/h4>\n

Gaidi, S., Galve, J.P, Melki, F. et al.<\/em> 2021.\u00a0Analysis of the Geological Controls and Kinematics of the Chgega Landslide (Mateur, Tunisia) Exploiting Photogrammetry and InSAR Technologies<\/a>. Remote Sensing<\/em>, 13<\/strong> (20), 4048; https:\/\/doi.org\/10.3390\/rs13204048.<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

The remarkable Chgega landslide in northern Tunisia consists of a block of limestone 900 m long and 400 m wide that is sliding on an underlying layer of clays and marls<\/p>\n","protected":false},"author":22,"featured_media":39255,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[608],"tags":[469,959,30658,17,788,30657],"class_list":["post-39252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-project","tag-featured","tag-landslide-report","tag-north-africa","tag-research","tag-review-of-a-paper-2","tag-tunisia"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/39252","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=39252"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/39252\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/39255"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=39252"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=39252"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=39252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}