An Earthquake Generates Three Kinds of Waves: Surface Waves (L-Waves),which

question 133

Multiple Choice

An earthquake generates three kinds of waves: surface waves (L-waves) ,which are the slowest and weakest,shear (S) waves,which are transverse waves and carry most of the energy,and pressure (P) waves,which are longitudinal waves and are the fastest.The speed of P waves is approximately 7 km/s,and that of S waves is about 4 km/s.People do not generally feel the P waves,but animals seem to be sensitive to them.If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake?

• A)100 km
• B)200 km
• C)300 km
• D)400 km
• E)500 km

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