Report of the Commission Appointed to Investigate Turtle Mountain, Frank, Alberta, 1911 (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Report of the Commission Appointed to Investigate Turtle Mountain, Frank, Alberta, 1911

Turtle mountain is in a more threatening condition now than last year. This opinion is concurred in by Mr. Boyd. The north shoulder 13, of course, the dangerous portion of the mountain. After the slide it was carefully examined and it has been closely watched sincc then, but until last yoar'i saw no signs of movement or. Apart from its structure, of weakness on this north shoulder. Last year I detected two cracks as shown on'the sketch map which I sent you last spring. They were so slight. However, that it would not have surprised me if their existence had been This year, howc ver. They were very marked. The cracks between this shoulder and the North peak also show development during the year. These cracks are significant as indicating movement and unstable con ditions. It is true that in some cases the block severed by the crack is not large enough in itself to cause much damage if dislodged, but as the joint plants along which the cracks de1elen dip towards the face of the clfi giving the block the form of an inverted wedge. Only those near the face can open, the weight of a large block tending. To keep the break closed. As the top surface is covered with shingle only a gaping crack' makes itself visible on the surface; hence a dangerous break back from the face. The break along which an enormous slide might take place. Might not be detect able on the surface; even at the tip the slide was about to occur.

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