EAS 201 2 - The Science of Natural Disasters Natural Disasters 7th ed by Patrick L Abbott(New York McGraw-Hill 2009 ISBN-13-337669-1 Written

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The Science of Natural Disasters Natural Disasters , 7th ed., by Patrick L. Abbott (New York: McGraw-Hill, 2009; ISBN-13: 978-0-07-337669-1). Written Assignment 2 Short Answer Questions Answer the following questions as completely as possible. 1. Explain how the arrival times of S and P waves can be used to determine the epicenter of an earthquake. [LO2.1] S minus P equals arrival time. Primary waves (P) merge from the ground traveling 1.7 times faster then S waves arriving first from their point of origin (epicenter) in a booming spherical fashion. Described as a compression wave, working in a push and pull model of force, traveling through all material. Secondary waves (S) are transverse waves, shaking particles with an up, down and side to side motion pulsating all solid materials in their path. If the rapture occurred deep within the earth this would be a hypocenter. The epicenter is the location of the rapture on the earth’s surface or the point vertically above the hypocenter, on the earth’s surface. The exact location of the epicenter can be determined using the length of time a P wave uses to travel to a seismograph versus the timing of the S waves arrival. The greater the distance traveled the greater the distance between the P and S waves. Eleven minutes in difference between the waves can mean 8,800 km from the seismogram. Scientists then plot the information from various seismograph locations to determine the precise location of the epicenter. The plotting is done in a radius, allowing the various
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This note was uploaded on 09/29/2010 for the course EAS EAS 201 taught by Professor Pearce during the Summer '10 term at Thomas Edison State.

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EAS 201 2 - The Science of Natural Disasters Natural Disasters 7th ed by Patrick L Abbott(New York McGraw-Hill 2009 ISBN-13-337669-1 Written

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