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The focus is the point underground where the earthquake originates.The epicentre is the point on the surface directly above the focus, where earthquake waves seem to spread out from.
In water or earth
By comparing the arrival times of the earthquake's waves at the two stations, you can determine the distance between the earthquake and each station. With this information, you can use triangulation to estimate the earthquake's location based on the intersection of the circles representing the distance between the earthquake and each station.
The North American and Caribbean tectonic plates caused the Haiti earthquake in 2010. The movement along the boundary between these two plates resulted in the devastating earthquake.
A transform boundary is formed when two plates are sliding past each other horizontally. This movement creates friction and pressure, which may eventually release as an earthquake.