Earthquakes are shocks that occur on the earth's surface as a result of the release of energy from within which then creates seismic waves.
The frequency of earthquakes that occur in an area refers to the type and magnitude of earthquakes experienced over a period of time.
Based on the theory of plate tectonics, the earth's surface is split and divided into a number of large tectonic plates.
The tectonic plates are free to move and interact with each other in the boundary area of the tectonic plates.
It is this tectonic plate border area which then becomes the place for active tectonic conditions and the potential for earthquakes to occur.
Earthquakes are generally caused by shifts in the earth's crust or plates. These earthquakes are called tectonic earthquakes.
In addition, the occurrence of earthquakes can also be caused by volcanic eruptions or commonly referred to as volcanic earthquakes.
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Besides the classification based on the cause, earthquakes can also be classified based on their depth.
Deep earthquakes are a type of earthquake which epicenter is more than 300 km below the earth's surface.
While medium earthquakes are centered between 60 km to 30 km below the earth's surface.