Earthquakes are the result of energy released by the movement of the Lithosphere along a Fault . Over time, pressure builds between each side of the fault, when the pressure is released friction causes waves of energy to be released. These energy waves are called seismic waves and are recorded by seismometers. Seismometers are machines that record the vibrations of the ground they stand on, these readings are scaled by intensity called the, Richter Scale . There are 2 waves we use to measure earthquakes, primary and secondary waves.
Secondary Waves move slower and travel through BOTH solids and liquids.
In this lab you will interpret a seismograph and use different readouts of seismic waves to determine the location of an Epicenter . Using the Lag Time, determ9ine the distance from the epicenter the location. Repeat step four for each city, with each circle's intersection your possibilities of epicenters decreases . Explain how the time between the P and S wave changes as the distance from the epicenter becomes greater.