Print Document or Download PDF

Essay on Reasons Behind Earthquake - 650 Words

Feed by Manisha Cat- Essay

Essay in very simple language with the boundaries of different words here. Here you can find Essay on Reasons Behind Earthquake in English language for 5, 6, 7, 8, 9, 10, 11, 12 and banking or other competitive exams students in 650 words.

Earthquakes are caused by many reasons, which come in two major categories, such as Non-tectonic and tectonic

(1) Non-tectonic causes:

In the diagram below, the relation of isocisal lines and epic related to earthquake non-tectonic causes and radiation pathways from the center of the earthquake is indicated.

People associated with geological agents running on Earth's surface, along with volcanic eruptions, volcanic eruptions and the collapse of underground caves.

(A) The cause of the surface can establish estimated vibration:

(i) Dashing waves and crashed breakers with beaches;

(ii) sudden descending water of high altitude in the case of falling water in adjacent areas;

(iii) Rocks falling and residences etc. in mountains, large landslides etc. In addition to the above, there are also artificial surface-factors that create perceptual shaking, for example, underground explosions, the path of trains and tanks, heavy machinery work, industrial areas, explosions in mines, dams under injured water pressure Failure etc.

(B) Volcanic Reasons: Volcanic earthquakes are mainly due to explosive explosions around active volcanoes and also forcibly fills up underground chambers and channels due to the magma hydraulic shock. A shock can also be made for any of the following reasons:

(i) The eruption of the volcano on the release and expansion of gases and lava,

(ii) the fault within the volcano caused by pressure in the chamber of molten rock, and

(iii) collapse of the center of the volcano in a place made by exiting out of gases and molten magnetic materials.

Generally, volcanic eruption occurs first or with earthquake. Such earthquakes occur only occasionally and are more localized in both its intensity and damage.

(C) Contraction of underground caves: Sometimes the surface of the ground falls suddenly due to the action of underground water, or the local blasts suddenly fall due to the removal of support from the bottom. It is usually seen in the caves of the tax areas.

(2) Tectonic causes

Almost 95 percent of all earthquakes are due to current or new mistakes due to the activities of Earth. The association of earthquake with fault lines is an established fact. Thus, due to fault or folding in the crust, earthquake is known as tectonic earthquake.

The tectonic term (Greek word takton means a creator) refers to the structural changes of the layer due to deformation or displacement. Such earthquakes are usually the result of sudden yield from the stress produced on the rocks by accumulating stress.

Professor HF Reed has proposed elastic rebound theory to explain the origin of tectonic earthquake. According to this principle of the Earth, due to being elastic, one can withstand a certain amount of stress without a permanent deformation.

When the stress exceeds the elastic limit then a crack or fracture develops. Friction resistance with fracture prevents fractured blocks from slipping from each other and thus creates tension. With high concentration of stress, rock units on either side of the fracture are subjected to heavy stress and there comes a phase when the rocks do not have any more stress, when abrasive resistance is eliminated at that time.

At this stage, there is sudden slip of the fractured block due to no tension. Thus, the energy stored in the system is released immediately through decades, so that underground displacement of rocks and the waves of energy are sent through the earth. These waves of energy are called seismic ripples which vibrate on the earth's surface.

Rocks or displacement as well as displacement of rocks is known as fault. Thus, according to "elastic rebound theory", earthquakes are usually associated with movement with a collapse.

The previous picture indicates elastic rebound theory. Most earthquakes are probably due to tectonic reasons, which are further supported by the fact that areas of intense and persistent earthquake are characterized by new acute tectonic movements.

Read More.


Go Back