Discussion
Match the following :
| (a) Planar shear surface | (i) Lahar |
| (b) Shear plane is concave-up | (ii) Translational slide |
| (c) Valley margin creep | (iii) Colluvium |
| (d) Debris mass of volcanic material | (iv) Rotational slide |
Answer: D
The correct matching is (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i).
- A slide moving on a planar shear surface is a translational slide.
- A slide on a curved, concave-up (spoon-shaped) surface, which rotates backwards as it moves, is a rotational slide or slump.
- Loose material that has crept and washed down the valley sides and accumulated at their foot is colluvium.
- A flowing mass of volcanic debris mixed with water is a lahar.
Options pairing (a) with lahar or rotational slide, or (b) with colluvium, confuse the shape of the failure surface with the type of deposit. Option C differs from the answer only by swapping colluvium and rotational slide for (b) and (c).
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