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Category: Earthquakes

Introduction to Earthquake

Earthquake is a natural disaster, which causes loss of lives and brings huge destruction to buildings, roads and properties. Earthquake occurs almost all the parts of the world. However some areas are more affected than the others. Those areas which are affected more and more and experience frequent earthquakes are called Earthquake Prone Areas. As

Seismic Waves. Types and Nature of Seismic Waves.

When a sudden break or shift occurs in the Earth’s crust, energy radiates out as seismic waves, just as the energy from a disturbance in the body of water radiates out in wave form. In every earthquake, there are several different types of seismic waves. Body Waves: Body waves move through the inner part of

Measurement of Earthquake

Measurement of Earthquakes: Earthquakes range from tremours so small that they are bearly detectable to great shocks that can destroy entire cities. This reflects their magnitude, the amount of the shaking of the ground as the quake passes, as measured by a seismograph. Magnitude is assessed on the Richter Scale, which assigns a number to

Size and frequency of occurrence of an earthquake

Size and frequency of occurrence of Earthquake: Small earthquakes occur nearly constantly around the world in places like California and Alaska in the US as well as in Chile, Peru, Indonesia, Iran, the Azores in Portugal, New Zealand, Greece and Japane. Large Earthquakes occur less frequently. In the (low seismicity) United Kingdom, for example, it has

Earthquake Prediction.

Predicting Earthquakes: Dilatancy Theory: Most of the prediction research is centered around the theory of Dilatancy. It has been notice that when a rock is stressed, it begins to expand; to dilate. This is caused by micro-cracks and fractures in the rock opening up and becoming larger. This only seems to start when a rock

Damages caused by an Earthquake

Earthquake Damages: Many seismologists have said that ”earthquakes don’t kill people, buildings do”. This is because most deaths from earthquakes are caused by buildings or other human constructions falling down during an earthquake. Earthquakes located in isolated areas far from human population rarely cause any deaths. Thus, in earthquake-prone areas, strict buildings codes requiring the

How much energy is released in an Earthquake

How much energy is released in an Earthquake? Earthquakes release a tremendous amount of energy which is why they can be so destructive. In the followed the different magnitudes with approximate amount of TNT need to release the same amount of energy. Magnitude 4.0 release 6 tonnes of TNT energy Magnitude 5.0 releases 199 tonnes

World distribution of earthquakes.

World Distribution of Earthquakes: Most earthquakes occur along relatively narrow belts that coincide with plate boundaries. This makes sense, since plate boundaries are zones along which lithospheric plates move relative to one another. Earthquakes at diverging plate boundaries: Diverging plate boundaries are zone where two plate move away from each other, such as oceanic ridges.

Earthquake Prediction.

Predicting Earthquakes: Dilatancy Theory: Most of the prediction research is centered around the theory of Dilatancy. It has been notice that when a rock is stressed, it begins to expand; to dilate. This is caused by micro-cracks and fractures in the rock opening up and becoming larger. This only seems to start when a rock

Earthquake prone countries.

Before going to ”Earthquake prone countries” here have a brief introduction to earthquake and causes and regions where they occur the most frequently. Earthquake is a severe thrilling of earth’s surface with two types of waves; compressional and longitudinal waves. These waves are called seismic waves. These seismic wave brings great devastation and destruction to