User:Kavitamogha94/sandbox

EARTHQUAKE:A SOURCE OF DAMAGE

An earthquake is a geological event inside the earth that generates strong vibrations. When the vibrations reach the surface, the earth shakes, often causing damage to natural and manmade objects, and sometimes killing and injuring people and destroying their property. Earthquakes can occur for a variety of reasons; however, the most common source of earthquakes is movement along a fault.

Some earthquakes occur when tectonic plates, large sections of Earth's crust and upper mantle, move past each other. Earthquakes along the San Andreas and Hayward faults in California occur because of this. Earthquakes also occur if one plate overruns another, as on the western coast of South America, the northwest coast of North America , and in Japan. If plates collide but neither is overrun, as they do crossing Europe and Asia from Spain to Vietnam, earthquakes result as the rocks at the abutting plates compress into high mountain ranges. In all three of these settings, earthquakes result from movement along faults.(what exactly is an earthquake?)

Earthquakes are caused by tectonic movements in the Earth's crust. The main cause is that when tectonic plates collide, one rides over the other, causingorogeny (mountain building), earthquakes and volcanoes. The boundaries between moving plates form the largest fault surfaces on Earth.(what is the main cause of an earthquake?)

some other causes of earthquake:-


 * Ground water-increase in pore pressure.
 * Pore fluid flow.
 * Building dams.
 * Stress transfer.
 * Silent slip.
 * Tides.
 * Surface quarrying.
 * Typhoons
 * Volcanoes etc.

Although probably the most important, direct shaking effects are not the only hazard associated with earthquakes, other effects such as landslides, liquefaction, and tsunamis have also played important part in destruction produced by earthquakes.(what is the effect of an earthquake?)

Types of earthquakes.....

There are four different types of earthquakes: 'Tectonic, volcanic, collapse and explosion.There are many different types of earthquakes: tectonic, volcanic, and explosion. The type of earthquake depends on the region where it occurs and the geological make-up of that region. The most common are tectonic earthquakes. These occur when rocks in the earth's crust break due to geological forces created by movement of tectonic plates. Another type,volcanic earthquakes, occur in conjunction with volcanic activity. Collapse earthquakes are small earthquakes in underground caverns and mines, and explosion earthquakes result from the explosion of nuclear and chemical devices. We can measure motion from large tectonic earthquakes using GPS because rocks on either side of a fault are offset during this type of earthquake.'

how do stay safe during an earthquake................


 * 1) DROP,COVER AND HOLD ON!
 * 2) Stay indoors until the shaking stop.
 * 3) Stay away from windows.
 * 4) If you are in bed,hold on,and stay there,protecting your with a pillow.
 * 5) If you are outdoors,find a clear spot away building,tress and power lines.