Q. 1 E3.9( 8 Votes )

Answer the follow

Answer :

People involved in the design, construction and operation of large dams are normally particularly sensitive to earthquakes.

This is because of four factors:

● Dams are often built in active earthquake areas

● Reservoirs can trigger earthquakes

● Some water supply structures are susceptible to earthquake motion.
Embankments and outlet towers respond to earthquake vibrations. Shaking an unstable slope that has been weakened after saturation by rises in ground water levels may produce a landslide into the reservoir.

● The consequence of a dam or water supply failure is high.

The effects of a dam failure on people and structures downstream are dramatic and obvious. A more likely example of earthquake damage would be loss of control of the water supply.

Dams by itself do not cause any earthquake. The purpose of any dam is to impound the flowing water. This leads to formation of reservoir in which a large portion of land is submerged along with the river course on which the dam is made. This leads to increase in the pore-water-pressure of that area. If there happens to be any known fault plane in the reservoir area, this sudden increase in pore-water-pressure may lead to increase seepage in the subsurface and eventual low of water along the fault-plane. In this worst-scenario this may lead to triggering a slip on that fault plane due to lubricant action of water-flow. This is called reservoir-induced earthquake.

So, from the above information we can conclude that there is a relation between dams and earthquake.

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