{"id":15290,"date":"2015-06-22T06:55:19","date_gmt":"2015-06-22T06:55:19","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=15290"},"modified":"2015-06-22T06:55:19","modified_gmt":"2015-06-22T06:55:19","slug":"landslide-induced-sediment-production-after-the-sabah-earthquake-in-malaysia","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2015\/06\/22\/landslide-induced-sediment-production-after-the-sabah-earthquake-in-malaysia\/","title":{"rendered":"Landslide-induced sediment production after the Sabah earthquake in Malaysia"},"content":{"rendered":"
Landslide-induced sediment production after the Sabah earthquake in Malaysia<\/h5>\n

The Mw=6.0 5th June 2015 Sabah earthquake in Malaysia<\/a>, which killed 18 people in rockfalls on Mount Kinabalu<\/a>, generated landslides that have released large volumes of sediment.\u00a0 The heavy tropical rainfall in Sabah means that this sediment is now starting to enter the river systems in the form of mudflows and sediment-rich flash floods.\u00a0 So, for example, last week villages around the town of Ranau were struck by a series of mudflows.\u00a0 In particular, Mesilau was very badly affected<\/a>,\u00a0 during a period of heavy rainfall last Monday. Mesilau lies on the flanks of Mount Kinabalu, but is some way from the main massif:<\/p>\n

\"Sabah<\/a>

Google Earth<\/p><\/div>\n

.<\/p>\n

The AsiaOne website has an interesting gallery of images<\/a> of the landslides that occurred last week:<\/p>\n

\"Sabah<\/a>

AsiaOne<\/a><\/p><\/div>\n

.<\/p>\n

\"Sabah<\/a>

AsiaOne<\/a><\/p><\/div>\n

.<\/p>\n

\"Sabah<\/a>

AsiaOne<\/a><\/p><\/div>\n

.<\/p>\n

Notable here is the amount of timber in the river – to me this suggests that there must have been quite extensive landslides in the forested areas on the lower slopes of the mountain.\u00a0 I have not seen detailed reports or images of these landslides.\u00a0 The threat that this timber provides to the water supply and to the river itself is clear.\u00a0 The post-seismic landslides from the Sabah earthquake are also moving quite large volumes of sediment, including large boulders.\u00a0 Typically the riverbeds will aggrade (the bed level will rise as sediment is deposited), which will greatly increase the threat of flooding and damage to infrastructure.\u00a0 This slug of sediment will work its way down the river, extending the effects of the earthquake well outside the area affected by the high ground accelerations. \u00a0 In effect this will extend the effects of the earthquake in time and space.<\/p>\n

The rainy season in Sabah starts in October, so this will be the main hazardous time.\u00a0 However, in the tropical environment of Sabah heavy rainfall can occur at any point in the year.<\/p>\n

Fortunately Malaysia has an excellent slope management organisation, JKR<\/a>, part of the Public Works Department.<\/p>\n

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

Landslides caused by the 5th June 2015 Sabah earthquake in Malaysia have released large amounts of sediment that is now causing extensive damage downstream<\/p>\n","protected":false},"author":22,"featured_media":15301,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[537,3],"tags":[23,469,959,244,641,314],"class_list":["post-15290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earthquake-induced-landslide","category-landslide-report","tag-earthquake","tag-featured","tag-landslide-report","tag-malaysia","tag-mudflow","tag-se-asia"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/15290","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=15290"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/15290\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/15301"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=15290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=15290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=15290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}