Dear reader we have discussed about continental drift in the very beginning posts of our blog. We have also learnt about formation of Mount Everest and Andes earlier. This theory shows us that the massive continents are pushing across ocean floor and through seas by some forces.
Plate tectonic is involved with above theory. Here earth surface is considered as coalition of number of intact blocks termed as plate. These large plates move past each other by a driving force. These plates are
2. American plate
3. Antarctica plate
4. Australia-Indian plate
5. Eurasian plate
6. Pacific plate
There have also 14 subcontinental plate also like
4. Philippine etc
These are also called microplates.
Microplates were broken from large plates (major plates) near boundaries of many plates. The deformations generated between plates are found to occur near narrow zones of their boundaries, some deformations are continuous and slow and some are sudden.
The slow and continuous deformation will not produce earthquake i.e. aseismic deformation and the sudden deformation produce earthquakes i.e. seismic deformation.
Seismic activity over the world showing epicenters of significant earthquake