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The Vaiont Dam area was vulnerable to mass movement because
Choose one:
A. underlying granite bedrock had begun to weather.
B. limestone beds there dipped parallel to the mountain slope and were interlayered with weak shale.
C. logging in the region had stripped the mountain tops of vegetation.
D. shale layers in that region dipped into the mountain slope, causing weakness.
B. limestone beds there dipped parallel to the mountain slope and were interlayered with weak shale.


Sagot :

The Vaiont Dam area was vulnerable to mass movement because limestone beds there dipped parallel to the mountain slope and were interlayered with weak shale.

The Vaiont Dam is characterized by a series of marl and limestone formations from the Jurassic/Cretaceous to the Eocene, with the valley forming large folds along the fold axis. The sediment layers found along the slopes of the mountains roll down into the valleys and form slip surfaces for mass movement.

After the disaster, geologists found a thin layer of green mudstone in the limestone of the Vaiont Dam. The clay layer served as a sliding surface for prehistoric landslides and was reactivated by rising water levels in the reservoir. Worst-case scenario denials by authorities and power companies continued due to a lack of understanding of large mass movements at the time. Over time, it occurs due to strong pressure and the process of solifluction, a type of soil creep that occurs where the rock is not weak, such as in limestone areas, and at high altitudes.

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