{"id":9600,"date":"2014-05-12T07:22:42","date_gmt":"2014-05-12T07:22:42","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?page_id=9600"},"modified":"2014-05-12T15:33:04","modified_gmt":"2014-05-12T15:33:04","slug":"rushtaq-landslide-old","status":"publish","type":"page","link":"https:\/\/blogs.agu.org\/landslideblog\/rushtaq-landslide-old\/","title":{"rendered":"The strange case of the Rushtaq landslide in Afghanistan"},"content":{"rendered":"
The Rustaq landslide<\/h5>\n

Whilst researching the Ab Barak landslide in Afghanistan<\/a> last week, I came across this image of another landslide in Afghanistan<\/a>:<\/p>\n

\"Rustaq<\/a>..<\/p>\n

This is clearly a very large and very spectacular landslide that has induced a enormous amount of damage.\u00a0 The reports were that this slide was also triggered by the heavy rainfall of 10 days or so ago.\u00a0 However, I did some background research and found that this is not the case.\u00a0 In fact, this landslide was triggered on 12th April this year – the above image (and another similar one) is on the European Space Agency website<\/a>, dated 13th April, with a caption that says:<\/p>\n

“An aerial view of landsliding caused by the massive earthquake, in Rustaq district of Takhar province, Afghanistan, 13 April 2014. At least four people have been found dead and more than 100 houses were damaged when an earthquake jolted two villages early 12 April in Takhar.<\/span>“<\/p><\/blockquote>\n

In fact, this landslide was reported in the media<\/a>, but with no real indication of the magnitude of the event.\u00a0 Although the ESA list the cause as an earthquake, in the media the landslide is attributed to an earthquake working in conjunction with heavy rainfall.<\/p>\n

The Rustaq landslide seems to be located at 37.155\u00b0N, 69.599\u00b0E, which yields this perspective view of the location in Google Earth:<\/p>\n

\"Rustaq<\/a><\/p>\n

..<\/p>\n

By eye, this looks to be the right location, although with the resolution of the imagery it is hard to be sure.\u00a0 The really interesting aspect of this though is the magnitude and location of the reported earthquake.\u00a0 The above article refers to the earthquake as follows:<\/p>\n

According to the United States Geological Survey, a minor 4.1-magnitude quake struck northeast Afghanistan at 2am at a depth of 203 kilometres.”<\/p><\/blockquote>\n

If that is right then this is the earthquake, which according to the USGS<\/a> had the following parameters:<\/p>\n

Magnitude: Mb=4.1
\nLocation: \u00a0\u00a0\u00a0 36.514\u00b0N, 70.403\u00b0E
\nDepth \u00a0\u00a0 \u00a0203.8 km \u00b1 9.0 km<\/p>\n

This is interesting as the earthquake was not particularly close to the landslide and it was also very deep.\u00a0 It would be highly unusual for such a deep earthquake, especially of this magnitude, to trigger landslides.\u00a0 However, it should also be noted that the landslide itself has developed a substantial amount of displacement.\u00a0 Whilst large, rapid, long runout, rainfall-induced landslides are far from unknown, the shape of this landslide seems quite unusual to me for one of these events.\u00a0 In particular, the low gradient upper portion of the landslide, with the very large displacement across the rear tension crack, is the sort of feature that I’d expect to develop progressively, or to result from a seismic event.<\/p>\n

On the face of it that appears not to be the case here, which makes the Rushtaq landslide unusual and very interesting.\u00a0 All-in-all it is slightly mysterious.\u00a0 Perhaps the most important aspect though is the hazard posed by the site – in future heavy rainfall or an earthquake, complete failure of this site is a distinct possibility.\u00a0 It has the potential to destroy large numbers of houses and it represents a major hazard in the valley.\u00a0 A landslide dam cannot be ruled out either.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Rustaq landslide Whilst researching the Ab Barak landslide in Afghanistan last week, I came across this image of another landslide in Afghanistan: .. This is clearly a very large and very spectacular landslide that has induced a enormous amount of damage.\u00a0 The reports were that this slide was also triggered by the heavy rainfall of 10 days or so ago.\u00a0 However, I did some background research and found that …<\/p>\n","protected":false},"author":22,"featured_media":9500,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9600","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/pages\/9600","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/page"}],"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=9600"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/pages\/9600\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/9500"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=9600"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}