Earthquakes

I am writing about earthquakes as part of the element earth. Earthquakes occur when there is a sudden release of energy from the earth's crust. This energy creates seismic waves. Earthquakes are recorded using a seismograph. The Richter scale measures the amount of seismic activity, above 7 causing serious damage and below 3 being imperceptible. The Mercalli scale measures the intensity of shaking. When the epicentre of a big earthquake occurs off-shore then there might be enough movement on the seabed to cause a Tsunami.

I got this image from www.scienceclarified.com/Di-El/Earthquake.html