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18 January 2010
Potential landslides in California and the ongoing crisis in Hunza, Pakistan
Amongst the (appropriate) focus upon Haiti at the moment, we must of course remember that landslides do not stop elsewhere. So, here are two important ongoing stories: 1. Potential landslides in California this week:The US National Weather Service has issued a series of warnings for very heavy rainfall in California this week, with the pontential for landslides, flash flood and debris flows. For example: …Flash flooding and debris flows possible …
21 December 2009
Landslides in Oregon
The Oregon Geological Survey has a quarterly magazine called Cascadia highlighting some aspect of the geology of that state. Their Fall 2006 edition focuses on landslides, with a series of articles on different aspects of landslides in that state. Some of the articles have a broader interest, such as the use of LIDAR for landslide mapping. The magazine is here: Cascadia
25 November 2009
A follow up to the Tennessee landslide video
A couple of weeks ago I highlighted a new landslide video from Highway 64 in Tennessee, USA. Thanks to the excellent GeoPracNet for highlighting that some aerial imagery is now available from News Channel 9 of the slide: Photo by Dennis Hutcheson The sliding plane was clearly an existing discontinuity sub-parallel to the slope, with movement perhaps being allowed by the cutting of the slope to create the road bench.
11 November 2009
One of the best landslide videos so far!
Many of the landslide videos that I have featured on here have been quite low quality. The one featured below is unusually good. I have updated this to provide the (better) Youtube version: The slide apparently occurred at Polk County in Tennessee, USA, on 10th November 2009. The slide appears to be a rockslide on a discontinuity dipping parallel to the slope. An interesting element of this is the clear …
4 November 2009
The basic physics of landslides is the same everywhere
Whilst landslides come in all sorts of shapes and sizes, the fundamental physics that controls material deformation on slopes is the same everywhere. I was reminded of this truism this week when Andrew Giles pointed out a large rockslide that occurred a few days ago, blocking Interstate 40 at Pigeon Gorge in North Carolina, USA. The Citizen-times.com website has a nice report and images of the slide: The images reminded …
27 October 2009
Animation of Seattle harbour liquefaction failures
Youtube has a rather cool video of an animation of the effects of a large earthquake on the harbour side area of Seattle. The main point is I think to show the effects of the earthquake on the elevated roadway, but it also shows liquefaction failures of the fill behind the sea wall: Pretty neat – certainly a useful teaching tool.
20 October 2009
Updates on the Nile River (Naches) landslide
Clearly the Nile River (Naches) landslide has effectively dropped off the media radar now. However, there are some excellent ongoing posts on this slide on the Sliding Though blog, which the is the Washington State landslide blogsite. You can access these posts here:http://slidingthought.wordpress.com/
16 October 2009
The Naches / Nile River landslide and the role of the quarry
Spectacular image of the Naches / Nile River landslide, from the Washington State DNR Flickr site Hat tip to Andrew Giles for pointing this out to me. The Seattle Times have run an article today about the role of the quarry in the triggering of the Naches landslide. They quite rightly point out that there is no firm evidence either way as to whether the quarry played a role or …
13 October 2009
So what caused the Naches landslide?
The Naches landslide, as I reported in my post yesterday, is a somewhat intriguing failure. The weather conditions were dry, the rivers are in low flow conditions, and there has not been an earthquake that could have caused the failure. So what happened? A clue may be in the landslide type. Several reports have suggested that the initial failure was a rotational slide. I am struggling slightly to get a …
12 October 2009
Updated and corrected: Large rockslide in Naches, Yakima County, Washington State
Updated: correct landslide location – thanks to various readers (especially Andrew Giles and Steve in ATL) for helping me to get this right – and apologies for the earlier error. I have posted an update to this post here. Various media agencies (e.g. here, here and here) are reporting a large landslide at Naches in Yakima County, Washington State, USA, which has blocked state highway. The Seattle Times has a …
Dave Petley is the Vice-Chancellor of the University of Hull in the United Kingdom. His blog provides commentary and analysis of landslide events occurring worldwide, including the landslides themselves, latest research, and conferences and meetings.
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