Mountain rupture

The left mountain flank moves downwards, the snow band marks the resulting flattening

A neck valley parallel to the ridge as a sign of a sagging of the right slope

As Bergzerreißung or bagging is called a slow and large-scale movement of bedrock under the influence of gravity . One effect of mountain disruption is the valley thrust .

The term mountain tearing was coined by the Austrian geologist Otto Ampferer . Ampferer distinguishes mountain rupture from the sudden collapse of mountain flanks, the landslides .

Typical features of mountain disruption in the starting area are crevices, double ridges and leveling along slopes and neck valleys , these are valleys parallel to the slope with surfaces falling inwards. Depending on the direction of foliation or stratification, these valleys can take on different shapes. In the case of shallow foliation or stratification, flatter counter slopes are caused. In the case of steep foliage, the individual blocks can tend to tip over and the result is rather steep valleys; in such a case, there is no need for a basal displacement horizon. Mountain ruptures occur particularly frequently in areas that were covered with large ice masses, on the one hand through slope relief, on the other hand through the multiple loading and unloading, which weakened the rock formation.

In the interior of the mountain, tearing up the mountain can create caves that are sometimes passable and whose passages often have narrow and high profiles. Rifted mountains can be a source of danger for rockslides or landslides.

See also

• landslide
• Sliding slope
• Debris flow
• Landslide
• Sagging
• Debris flow

Individual evidence

1. ↑ Otto Ampferer: Bergzerreißungen in the Inn valley space , from the Proceedings of the Academy of Sciences in Vienna, Mathem.-Naturw. Class, Verlag Hölder-Pichler-Tempsky, Vienna 1941.
2. ^ O. Adrian Pfiffner: Geology of the Alps , UTB Verlag, Stuttgart 2009, ISBN 3825284166 , pp. 341-345.
3. ↑ Mountain rupture and valley thrust using the example of Brennkogel-Gulling / Styria , accessed on June 26, 2009.
4. ↑ Association of Austrian cavers: Speleo leaflets 2. Delivery (October 2007), p C24a. PDF ( Memento of the original dated August 30, 2008 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed June 22, 2009. 
5. ↑ S. Hermann: Initial mountain disruption as a source of danger for landslides, nutrient area for mudslides and large slides. Examples from the Sölktäler Nature Park, Austria. Interpraevent 1996, Volume 1, pp. 409-418. Retrieved November 9, 2012.

Web links

Guide to processing mass movements (PDF; 2.6 MB)