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What is Earthquake? Discuss the causes of Earthquake resistance

What is Earthquake? Discuss the causes of Earthquake resistance
structures. (Dec- 2013) (July2014)
What are Earthquake? How they are caused? Discuss in detai precautionary measures followed in the design of seismic tolerant structures.

Asked On2017-05-16 19:46:10 by:Rajiv

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Earthquake is a natural phenomenon, which can occur any time anywhere. Therefore, the Buildings must be built in such a way that they are safe during such occurrence. IS: 1893, Code Of Practice For “CRITERIA FOR EARTHQUAKE RESISTANT DESIGN OF STRUCTURES” give the guidelines for the design of structures
Earth is a Spherical body made up of mainly four layers consisting of Inner & Outer Core, Mantle and Crust as shown in Figure 1. The Core of Earth is very hot. There is enormous temperature and pressure gradient between Core (innermost layer) and Crust (outermost / top layer), which generates convection currents in the Mantle. These currents cause the Crust and a portion of the Mantle to slide over the outer Core. It also gives rise to the development of strain energy, which causes crust to slide over mantle. Earth’s crust consists of 7 major tectonic plates (that contain continents and ocean basins), which keep moving in different directions. As a result of such movements, strains are building up at plate interfaces. In course of time, when this cumulative strain energy becomes excessive for the rock plates to sustain, it gets released in the form of a slip occurring between adjoining plates. The interface of plates is called fault or fault zones. Some of these faults are active, whereas others are not. When the amount of energy stored inside Earth’s body increases and exceeds the breaking strength of the Earth’s crust in a active fault zone, then it suddenly breaks and releases the energy stored inside the Earth causing vibrations or Earthquake. There are many other explanations about the occurrence of earthquakes.

Answerd on:2017-05-17 Answerd By:Shikhil

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