{"id":395,"date":"2009-07-08T08:12:00","date_gmt":"2009-07-08T08:12:00","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/2009\/07\/08\/shallow-landslides-in-county-mayo-ireland\/"},"modified":"2010-10-21T13:37:15","modified_gmt":"2010-10-21T17:37:15","slug":"shallow-landslides-in-county-mayo-ireland","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2009\/07\/08\/shallow-landslides-in-county-mayo-ireland\/","title":{"rendered":"Shallow landslides in County Mayo, Ireland"},"content":{"rendered":"<p>Last Thursday (2<span class=\"blsp-spelling-error\">nd<\/span> July) an unusually strong rainstorm passed across the northwest of Ireland.  <span class=\"blsp-spelling-corrected\">Considerable<\/span> damage was caused, as recounted in <a href=\"http:\/\/www.irishtimes.com\/newspaper\/ireland\/2009\/0704\/1224250039813.html\">this Irish Times article<\/a>, with floods occurring across quite a large area.  The rainfall in the <span class=\"blsp-spelling-error\">Castlebar<\/span> area was <span class=\"blsp-spelling-corrected\">particularly<\/span> intense &#8211; there is a quite nice article on this in the <a href=\"http:\/\/www.mayonews.ie\/index.php?option=com_content&amp;task=view&amp;id=7080&amp;Itemid=38\">Mayo news<\/a>.  This rainfall appears to have triggered a set of large but shallow slides at <span class=\"blsp-spelling-error\">Croaghmoyle<\/span>.  <a href=\"http:\/\/www.castlebar.ie\/photographs\/Landslide_at_Croaghmoyle.shtml\"><span class=\"blsp-spelling-error\">Castlebar<\/span> News<\/a> has two images, shown below, of the landslides:<\/p>\n<p><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-1.jpg\"><img decoding=\"async\" style=\"margin: 0px auto 10px;text-align: center;cursor: pointer;width: 400px;height: 300px\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-1.jpg\" alt=\"\" border=\"0\" \/><\/a><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-2.jpg\"><img decoding=\"async\" style=\"margin: 0px auto 10px;text-align: center;cursor: pointer;width: 400px;height: 300px\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-2.jpg\" alt=\"\" border=\"0\" \/><\/a>The top (overview) shot is quite interesting.  The large slide that is most obvious appears to have started as a very localised slip in what I think is probably a blanket peat layer high up on the slope (see annotated image below).  The main slide is of the shallow <span class=\"blsp-spelling-error\">regolith<\/span> layer on the boundary with the underlying bedrock.  It appears that a <span class=\"blsp-spelling-corrected\">comparatively<\/span> small change in gradient low on the slope caused the slide to cease to erode and start to deposit, although the material has moved a <span class=\"blsp-spelling-corrected\">considerable<\/span> distance over the land surface and onto the track.  This is not unusual in this type of slide.  The other slides appear to just be on the <span class=\"blsp-spelling-error\">regolith<\/span> \/ rock boundary.<\/p>\n<p><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-1a.jpg\"><img decoding=\"async\" style=\"margin: 0px auto 10px;text-align: center;cursor: pointer;width: 400px;height: 300px\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-1a.jpg\" alt=\"\" border=\"0\" \/><\/a><br \/>The second image shows the debris on the road, which appears to be mostly peat and some entrained bedrock pebbles and cobbles.  This road is the access track for a large television transmitter &#8211; <span class=\"blsp-spelling-corrected\">two<\/span> technicians were trapped on the wrong side by the landslides.<\/p>\n<p>The Irish <span class=\"blsp-spelling-corrected\">Meteorological<\/span> Service has a short article on the rainfall <a href=\"http:\/\/www.met.ie\/news\/display.asp?ID=21\">here<\/a>.  The peak rainfall intensity in nearby Newport was 41.6 mm in 24 hours, which has an annual <span class=\"blsp-spelling-error\">exceedance<\/span> probability of 1 in 150.  60 mm of rainfall was recorded in total, with a maximum one minute intensity of 2.8 mm, and a <span class=\"blsp-spelling-corrected\">maximum<\/span> five minute intensity of 9.8 mm.  The rainfall was thundery, so this image of lightning strikes shows the <span class=\"blsp-spelling-corrected\">rain bands<\/span> quite well:<\/p>\n<p><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-3.jpg\"><img decoding=\"async\" style=\"margin: 0px auto 10px;text-align: center;cursor: pointer;width: 400px;height: 246px\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2010\/10\/09_07-ireland-3.jpg\" alt=\"\" border=\"0\" \/><\/a><\/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>Last Thursday (2nd July) an unusually strong rainstorm passed across the northwest of Ireland. Considerable damage was caused, as recounted in this Irish Times article, with floods occurring across quite a large area. The rainfall in the Castlebar area was particularly intense &#8211; there is a quite nice article on this in the Mayo news. This rainfall appears to have triggered a set of large but shallow slides at Croaghmoyle. &hellip;<!-- 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":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[303,959,304],"class_list":["post-395","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-ireland","tag-landslide-report","tag-peatslide"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/395","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=395"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/395\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}