geologyChapter 9

geologyChapter 9 - 6 Most earthquakes take place in the...

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Chapter 9 1.) An earthquakes epicenter is a point on the surface directly above the focus. 2.) With few exceptions, the most damaging earthquakes are shallow focus. 3.) A tsunami is a seismic sea wave. 4.) A P-wave is one in which movement is forward and back in the same direction as the  wave travels. 5.) It would take about 27,000 earthquakes with a Richter magnitude of 3 to equal the  energy released in one earthquake with a magnitude of 6.
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Unformatted text preview: 6.) Most earthquakes take place in the circum-pacific belt. 7.) The geothermal gradient is Earth’s temperature increase with depth. 8.) The seismic discontinuity at the base of the crust is known as the Moho. 9.) The phenomenon in which seismic waves change their direction of travel when they move through materials that have different properties is known as refraction....
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