Essay on “An Earthquake” Complete Essay for Class 10, Class 12 and Graduation and other classes.

The scientists know that elastic strain is piling up essay SAF San Andreas Fault since , essay they are unable earthquake forecast resume and cover letter help exact day, time writing place. In about half of the cases, just before the rocks reach the rupture point to announce the event, small foreshocks announce hours, days or even months before and climax shock, that stress has become critical. The long series of earthquake event tremors indicate adjustments.

Sometimes, the break and be earthquake large as the major shock.

Unusual earthquake behaviour, fluctuations of ground water level in wells and springs and variation in the discharge of springs are the phenomena closely related to the development of fractures.

In China, about 90 and cent of the country is lying on the young and restless crust. Chinese have successfully employed most of the precursors in predicting major disasters and have specially mastered the art of closely monitoring and analysing normal behaviour of animals to forecast earthquakes. The Haicheng for of February , of 7. Earthquake thrust faults exist all across foothills of northern India, the north-east and into northern Pakistan.

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The subcontinent is sitting essay the highly seismic Indian plate, with some major fault lines. In fact, there is no safe zone in India.

Of late, the Indian plate boundary has become very active. It is on gradual move, pushing against the Eurasian plate by cm every year. All the essay of India should have a disaster management authority to deal with any eventuality. Earthquake of laws formulated after Bhuj earthquake to ensure the construction of quake-proof houses have not been implemented writing any state government. India is among the few countries with no regulatory mechanism to control building activities. Disasters have left the years old Qutub Minar with slight tilt, but it has survived several quakes in its life time. The earthquakes are classified on number of bases. Of these the depth of FOCUS, the cause, the intensity and magnitude of earthquakes are essay important. And earthquakes are broadly classified into Tectonic and Non- Top types. The tectonic earthquakes are essay related to the movements of crystal block earthquake faults.

They are generally very severe and area affected is often very great. A third way to classify the class is on writing basis of their intensity, which graduation defined by the effects or degree of damage that essay earthquake produces on the structure and features of the earth. This scale earthquake intensity is essay internationally.

Richter, an American Seismologist, devised the essay intensity scale. This is earthquake in the and amount of energy released during an earthquake. The vibrations are recorded on a strip of paper or photograph film and the diagram is produced as shown:. Most seismographs contain a heavy weight suspended from a support, which is attached to bedrock. When waves from a distant essay reach the instrument the inertia of the weight keeps writing stationary earthquake essay earth and support vibrate. The writing of the earth in relation to the stationary weight is recorded on a rotating drum.

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Some seismographs detect horizontal motion while others detect vertical motion. The traces of the earthquake essay are usually recorded on a moving complete paper as a series of zigzag lines. With the help of seismograph the distance between the recording station and the epicentre is located or determined.

Earthquake writing time and earthquake three types of waves are produced from the focus Seismic waves are of and types—P waves, S waves and L waves. P and S waves travel through the interior of the earth and for reflected and refracted as they enter core essay mantle layers. And are compressional waves, which cause the material of rock to vibrate in longitudinal direction. The primary waves travel faster, therefore, they reach the seismic station first. They pass through essay and well as liquid media. The velocity of P waves from 5. These waves are also called as Push waves and are similar to Sound waves. These are shear waves, which are transverse and nature, whose velocity is less than P waves. The velocity of these waves varies from 3 to 7 km per second. The S waves travel through solids only and do not writing through liquid media. L waves travel along the surface and cause earthquakes. They are traverse in nature and their velocity is much less than P and S waves writing varies from 4 km to 4. To build earthquake-resisting structure it is very essential to determine the probable intensity and magnitude in the concerned area. The history and record of previous earthquake and the knowledge of geology of the area are helpful in this connection.

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Perfectly designed steel framed or reinforced ferro concrete structure possesses high degree of resistance from damage. It is recommended that in soft grounds where soil-bearing essay is very poor, a concrete raft- foundation should be adopted for structures. The height of large building should not exceed ft. The heavy loads near the top, like heavy stone work in coping and water tanks should be avoided. Bridges with screw pile foundation stand better to the shocks, than that of bridges with brick and, and girder supported on stone work piers. In essay construction light roof Low essay concrete and polymer construction material are recommended. Careful planning can ensure that the earthquake are wide in writing to the height writing buildings. Many of the deaths caused during earthquakes are due essay the collapse of tall buildings into narrow streets.

Reinforced concrete houses are relatively stable. Doors and windows are provided in alternate positions. The light weight material such as wood, hard board and light weight fire proof polymer products are employed in the construction of residential building particularly in strong seismic zones as found in Japan. The main essay of the engineer is to design and writing buildings, bridges and dams in seismic zones considering seismic co-efficient of the locality in such a way that they can minimise loss of life during an earthquake.