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Word Count: 404
Throughout history man has made many advancements These advancements have been made to make life easier The one thing man cant do is to control Mother Nature Mother Nature can cause many things such as earthquakes There are generally three kinds of faults normal reverse and strike-slip By careful observation and measurement geologists acting like detectives can tell how much a fault moved which part went up which part went down and which way the fault moved When one of the plates slip under the great amount of stress at the fault an earthquake occurs The shaking we feel are the passing of long waves The L-waves long waves travel at slower velocities that the primary and secondary waves These waves make the largest squiggles on a seismograph but their effect diminishes rapidly with distance The L-waves are limited to the crust One of the two kinds of waves are Primary waves which are a kin to sound waves and thus produce alternate compression and rarefaction in the medium through which they travel much like the waves that spread out through the air in all directions from a tuning fork The second of the two kinds of waves are Secondary waves the particles in the rock through which the wave is traveling vibrate at right angles or transversely to the direction of 3 Last Name propagation The velocity of P-waves are almost twice as fast as S-waves A seismologist cannot locate the epicenter of an earthquake that has shown up on his seismometer from the seismogram or written record alone All the seismogram tells him are the times when the P and S waves reach his station and how violent they are To locate a quake the seismologist first finds the difference between the time of arrival of the P wave and that of the S wave To measure and identify these waves an invention called the seismometer was used Charles
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