Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
Display:
Heh. I wondered about the "moving" bit. So I googled quickly around, but didn't find much. I did find this, from 2002 in this pdf:


The Formación Roja is the lower unit and includes clays, siltstones, argillites, and shales. These are strongly cemented by mainly gypsum and also calcium carbonate, which occur both in the rock material and as infill of the discontinuities. The gypsum cementation gives the Red Formation claystones a high strength and gives the rock a massive appearance.

The upper "Lake roof formation" consists of interstratified layers of limestone and marl, but can be divided into two units: one of dominantly limestone and another of dominantly marls. The units are generally jointed and occasionally faulted. The thickness of the layers is generally on the order of decimetres. Thicker layers occur; most are less than 1.5 - 2 meters thick. In this formation a few erodable clayey layers occur.

I'm not (yet) a star in engineering geology, but in structural geology, the bit about gypsum should've set off alarms. Gypsum is the earth's ideal lubricator. A third of Greece slides on a 10 centimeter band of gypsum, exposed at the surface. It doesn't take much pressure to change gypsum's viscosity, and slide you go.

If you'd know some more links/literature on the geological aspect, I can have a look...

by Nomad on Wed Feb 20th, 2008 at 01:07:49 PM EST
There is a background story about that problem, but I don´t remember the link:  The line was supposedly traced to go through some lands purchased (shortly before) by Aznar´s now-son-in-law (Alejandro Agag of Formula One deals) and where some of the sink holes occurred.

Our knowledge has surpassed our wisdom. -Charu Saxena.
by metavision on Wed Feb 20th, 2008 at 03:36:33 PM EST
[ Parent ]
I'm not sure what you refer to now: the sink hole region near Zaragoza, the sliding valley side near Tarragona, ro both?

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Feb 20th, 2008 at 05:58:53 PM EST
[ Parent ]
Darn, I thought I could find it in the PP parody web page, (los genoveses) but no luck.  IIRC it was in Aragon region, so it must be the Zaragoza part and it was about sinking.

Our knowledge has surpassed our wisdom. -Charu Saxena.
by metavision on Thu Feb 21st, 2008 at 01:15:28 PM EST
[ Parent ]
I think I read at least a dozen articles on this (or "read": many were in Spanish), including your pdf, but I think there was one other detailed source that mentioned that the problem was known and the government was warned about it (probably by the authors).

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Feb 20th, 2008 at 06:02:00 PM EST
[ Parent ]

Display:

Occasional Series