Geologists use seismic waves to locate an earthquake's epicenter. To abbreviate, use the symbol M (a capital M, plain text, no sub/superscripts) expressed to the nearest 0.1. xb``d``Id`a`Ab@_ :iWGi>|q` Great-circle arcs are drawn on the globe using the distance of the earthquake to the station as a radius. distance = travel time for S waves earthquake - shaking and vibration of Earth's surface. Conclude the activity with a class discussion (and perhaps homework questions) to share ideas and answers, as described in the Assessment section. HS-PS4-1. When an earthquake strikes, P waves arrive at a seismograph rst and S waves next. Explains how to find an earthquake epicenter using at least three seismograph stations. Accessed December 11, 2013. http://en.wikipedia.org/wiki/Moment_magnitude_scale, Novak, Gary. Make changes to the sample. 0000007783 00000 n DocHub v5.1.1 Released! If a quake is near the seismograph, the S-waves arrive shortly after the P-waves. 0000003991 00000 n 0000001675 00000 n 0000003966 00000 n Geology Labs On-Line, Department of Geological Sciences, California State University, Los Angeles, CA. minutes? 0000001604 00000 n DOC Home - Westerville City Schools All the arcs should intersect at a common point - the epicenter. Point on Earth's surface directly above an earthquake's focus. 0000078169 00000 n Earthquakes occur along faults, which are cracks in the Earths crust that build tension. A minimum of three seismic stations is necessary to locate an epicenter. Engineers first determine where earthquakes are likely to occur, and how severe they are likely to be. determine the epicenter using the S P (S minus P) method. epicenter: A point on the Earth's surface that is directly above the place where the underground forces of an earthquake originate. PDF Finding Epicenters and Measuring Magnitudes Worksheet
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