The earthquakes

Starting with the history of eartquakes we have to start knowing the concept of these movemnts and the reason why it occur.

An earthquake is a suddenly realese of energy in the Earths crusf that creats seismic waves.
This kind of movemnts are recorded by a seismometer or also called as sesismograph.
The moment magnitud is almos always reported from trhee to seven degrees richter.