Answer:
An earthquake can be defined as two blocks of earth suddenly slip on one another. The surface where they slip is known as the fault.
The center is technically non as hypocenter and location above it is kn own as epicenter. There is an instrument known as seismometer which measures the intensity of the earthquake.
The earthquake can be mild as well as strong. The mild earthquake cannot be that dangerous but if the intensity of the earthquake is more then it can really deadly as the buildings can collapse and people can die inside it.
The science behind the earthquake is the movement of tectonic plates which results in earthquake.