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Name Class Date Locating an EarthquakeHonors ScienceThe focus of an earthquake is the actual placewithin Earth where the earthquake originates.When locating an earthquake on a map, scientistsplot the epicenter, the point on Earth’s surfacedirectly above the focus. To locate an epicenter,records from three different seismographsare needed.Problem How can you determine thelocation of an earthquake’s epicenter?Materials?drawing compass?world map or atlasSkills Measuring, Interpreting Maps,Interpreting GraphsProcedure1.The seismograms shown in Figure 1recorded the same earthquake. Usethe Travel-Time Graph to determine thedistance of each station from the epicenter.Record your answers in the Data Table.Figure 12.Refer to a world map or atlas for thelocations of the three seismic stations. Placea small dot showing the location of each ofthe three stations on the map in Figure 2.Neatly label each city on the map.3.On the map in Figure 2, use a drawing compass to draw a circlearound each of the three stations. The radius of the circle, in miles,should be equal to each station’s distance from the epicenter. Usethe scale on the map to set the distance on the drawing compass foreach station. CAUTION: Use care when handling the drawing compass.DATA TABLENew YorkSeattleMexico CityElapsed time between first P and first S wavesDistance from epicenter in milesAnalyze and Conclude1.Using Graphs How far from theepicenter are the three cities located?2.Calculating What would thedistances from the epicenter to thecities be in kilometers?3.Interpreting Maps What is theapproximate latitude and longitudeof the epicenter of the earthquakethat was recorded by the threestations? Use the map in Figure 3.Figure 2 Travel-Time Graph4.Drawing Conclusions On the NewYork seismogram, the first P wavewas recorded at 9:01 UTC. UTC isthe international standard on which most countries base their time.At what time (UTC) did the earthquake occur? Explain.Figure 3 ................
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