Earthquakes and Math 

Earthquake scientists (seismologists) use circle geometry to locate the epicenter of a quake and logarithms to classify its severity using the Richter scale. 

Epicenter of an Earthquake 

The epicenter of an earthquake is located by using circle geometry and special devices called seismometers. 

The Global Positioning System and Circles 

The Global Positioning System is based on common mathematical equations of distance and speed. Trilateration enables GPS receivers to find the latitude, longitude, and altitude of a receiver, anywhere on the earth. 

Navigation 

Two successful navigation systems known as Loran (Long Range Navigation) and GPS (Global Positioning System) are based on the principles of the hyperbola and the circle, as well as the idea of trilateration. 
