Earthquake Introduction Cause Effect And Images

Introduction:

An earthquake is the result of a sudden release of energy in the Earth's crust that create sseismic waves. Earthquakes are measured using observations from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe. The more numerous earthquakes smaller than magnitude 5 reported by national seismological observatories are measured mostly on the local magnitude scale, also referred to as the Richter scale. These two scales are numerically similar over their range of validity. Magnitude 3 or lower earthquakes are mostly almost imperceptible and magnitude 7 and over potentially cause serious damage over large areas, depending on their depth. The largest earthquakes in historic times have been of magnitude slightly over 9, although there is no limit to the possible magnitude. The most recent large earthquake of magnitude 9.0 or larger was a 9.0 magnitude earthquake in Japan in 2011 and it was the largest Japanese earthquake since records began. Intensity of shaking is measured on the modified Mercalli scale.

  Cause:

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 causing orogeny earthquakes and volcanoes.The boundaries between moving plates form the largest fault surfaces on Earth. When they stick relative motion between the plates leads to increasing stress. This continues until the stress rises and breaks suddenly allowing sliding over the locked portion of the fault and releasing the stored energy.

Earthquake Effect In As Follows:

1. Shaking and ground rupture

2. Landslides and avalanches
3. Fires
4. Soil liquefaction
5. Tsunami
6. Floods
7.Human impacts

Images:

Image Of Earthquake

Image Of Earthquake

Image Of Earthquake

Image Of Earthquake

Image Of Earthquake

Image Of Earthquake

Image Of Earthquake