Earth quake

Shaking or vibration of earth surface is called earthquake. It destroys a large number of lives and large amount of property. There are two types of earthquake. They are the vertical earth quake and the horizontal earthquake.
In the vertical earth quake, the earth's surface vibrates up and down; and in the horizontal earth quake; the earth's surface vibrates horizontally.
Earthquake cannot be fore casted. No such instrument has been invented which can detect the potential earthquake previously so that people can be informed. That is why, earthquake is very dangerous. Its magnitude is measured by using an instrument called seismograph and its unit is Richter. Richter scale varies in between the range of 0 to 9. The earthquakes having magnitude of more than 7 Richter scale are considered to be very destructive.
The seismic tremors experienced before a big.
Earthquake are called fore shocks and the tremor's experienced after a big earthquake are called after shocks. Earthquakes are mainly caused by following activities.
-Tectonic activities; due to the motion of tectonic plates( continental plate) .
- Volcanic activities; due to the flow of magma (lava) during the volcanic eruption.
#Local activities: due to the explosion of bombs, erosion, deposition and landslide.