Allison,
I'm so sorry for taking so long in answering. Today has been catch-up day and for an ADDer, a necessity because we tend to take on a hundred things at once (or so it seems). Anyway, The type of landflow that I think you are refereing to is a typical slump. The first slump I ever saw up close and personal is the Campbell Landslide on the bluff of the Mississippi River and was caused by one of the New Madrid quakes in 1812-13. Typically, the slide begins from the top and usually slowly, as it takes time for that material to work loose. The material that flows is generally tree root deep on a porous hillside. But instead of rolling down a hill, the internal material (soil, rocks, tree roots), folds inwardly then down pushing the entire mass. With the deeper material having more mass, it tends to move beneath the lighter and therefore shoves up the earth from below into what is called a "toe." The end result is that little hillock and a lot of material welled up at the bottom of the hillside. Liquefaction can cause a slump, as well as a very wet climate or highly porous soil, as mentioned before.
Believe it or not, there is a housing development now at the top of the Campbell slump and with that bare hillside still exposed to the elements, it's only a matter of time before it all comes down again.
Lin
On Thu, Feb 14, 2013 at 7:14 AM, Allison Maricelli-Loukanis <allison.ann@att.net> wrote:
lol...very entertaining. So the type of landflow here that Vic is talking about bubbles up because it slides down and then sort "humps' up later on? Is that the bubbling up? I might have to see the video again...Allison
From: Lin Kerns <linkerns@gmail.com>
To: Geology2 <geology2@yahoogroups.com>
Sent: Wednesday, February 13, 2013 8:56 PM
Subject: Re: [Geology2] Major disruption for rail passengers in Yorkshire after tracks are left twisted by colliery landslip
There's a good explanation as to what Vic describes as "bubbling up," and that's due to the two major types of landflows. Sorry to say, but this amateur video is one of the best out there to explain the difference:
http://www.youtube.com/watch?v=5EYu7TuoyBUIf I was this kid's teacher, I definitely would've given him an "A" just because he tried so hard.LinOn Wed, Feb 13, 2013 at 1:32 PM, Allison Maricelli-Loukanis <allison.ann@att.net> wrote:
Great pictures...very illuminating. You describe the displacement as bubbling up but to my uneducated eye it looks like it slipped down a small hill. The CA pix were interesting too. Incidentally, we refer to a water fountain here in Wisconsin as a "bubbler". Just a factoid. lol..Allison
From: Victor G Healey <vic.healey@gmail.com>
To: Geology2 Mailing List <geology2@yahoogroups.com>
Sent: Wednesday, February 13, 2013 8:49 AM
Subject: [Geology2] Major disruption for rail passengers in Yorkshire after tracks are left twisted by colliery landslip
What is fascinating is that this land slip appears to have bubbled up from below the railroad tracks in Yorkshire.
Look at how the tracks have been displaced.
They are not sure how to fix the problem.
Here is another picture from CA in USA of how a landslip can leave the surface intact as it moves downward, look at the trees and fencing.
http://www.dailymail.co.uk/news/article-2277984/Yorkshire-rail-delays-Major-disruption-rail-passengers-Yorkshire-tracks-left-twisted-colliery-landslip.htmlMajor disruption for rail passengers in Yorkshire after tracks are left twisted by colliery landslip
- 'Spoil tip' - coal-mining waste material - from Hatfield Colliery near Doncaster slid under track
- Line between Goole, Doncaster and Scunthorpe closed
- Journey times for travellers extended by up to an hour
- Delays expected to last until at least Saturday
By NICK ENOCHPUBLISHED: 07:53 EST, 13 February 2013 | UPDATED: 08:56 EST, 13 February 2013
Rail passengers in Yorkshire face long delays today after tracks were left twisted due to a landslip.The damage was caused by a 'spoil tip' - coal-mining waste material - from Hatfield Colliery sliding under the track and causing it to break up.Network Rail said it had been forced to close the line between Doncaster, Goole and Scunthorpe after the track became unsafe.
A train driver first reported concerns about buckling of the track in Stainforth, near Doncaster, in South Yorkshire, on Saturday but it was not until early yesterday morning that pit staff raised the alarm after the track conditions worsened.
Rail passengers are facing major disruption today after tracks were left twisted due to a landslip in Stainforth, near DoncasterNetwork Rail said a number of services were affected with buses replacing trains between Doncaster and Goole and Doncaster and Scunthorpe, with journey times being extended by up to an hour
--
--
__._,_.___
No comments:
Post a Comment