Siberian Mouse M 45 296
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The plunge crack just above the limestone at the top of the névé. It is a forceful crack and collapsed during the night. (a) The local micro-movement of the rock surface (b) The crack front. The crack speed was as high as 2 m/h. (c) Cracking propagated along the névé (d) Crack propagation at an angel of +/- 60 within the névé.
Below is an animation of the collapse sequence of the plunge crack shown above. The arrows indicate the direction of crack propagation. The first photo below shows the progression of the crack from the side of the névé. The photo below shows the collapse of the crack after about 10 minutes of propagation.
The C1 to C2 part represents 220 kms with an average gradient of EK 45° (directional lateral and vertical component) and an average RSW of 4 % within the glacier and the névé. The line pottery and the spatially oriented brittle fractures in the Y-C2-C3 part appear to come from the same source. This must be an impact with a very high lateral component at lower elevation. In the St. Bernard névé, the surface of the rock often consists of chipped granite and quartzite. If the impact source were below the surface, the source would have moved laterally at high speed resulting in a low-angle lateral source. The possible high, steep angle of the Y-C2-C3 part indicates the source was present during the Miocene time when the now St. Bernard névé was covered by andesite and granites of the Alps. The big part of the glacier, in contrast, started its development during the Miocene (probably towards the end of the last ice age) and was covered by glacial till and dolerite during the snow-point advance. d2c66b5586