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Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Solve the following questions with the provided information
The first P wave arrived Degan. 5. If the first P wave was recorded at 10:39 Y.Y. local time at the station in Figure 4.2, what was the local time at the epicenter when the earthquake began. (Hint: The earthquake began at the epicenter.) Y.Y. local time ACTIVITY 4.2B Locating an Earthquake Figure 4.5 shows seismograms for the same earthquake recorded at three locations-New York; Nome, Alaska; and Mexico City. Use this information to complete the following. 1. Use Figure 4.5 and the travel-time graph in Figure 4.4 to determine the distance between each station and the epicenter. Write your answers in Table 4.1. 2. Use Figure 4.6 and a drafting compass to draw a circle around each of the three stations. Make the radius (in miles) of each circle equal to the station's distance from the epicenter as determined above. (Use the scale on the map to set the radius on the drafting compass.) The circles you draw should intersect at approximately one point. This point is the epicenter. If they do not intersect at one point, find a point that is equidistant from the edges of the three circles and use this as the epicenter. Label the epicenter on the map. 3. What are the approximate latitude and longitude of the epicenter of this earthquake? Latitude: Longitude:w 4. The first P wave was recorded in New York at 9:01 EST. At what time (EST) did the earthquake actually occur? EST Figure 4.5 Seismograms of the same earthquake ecorded in three different cities. THREE SEISMOGRAMS Seismogram A - New York, NY 1 minute H Seismogram B- Nome, Alaska FIRST S WAVE Seismogram C-Mexico City, Mexico FIRST P WAVE cont
Transcribed Image Text:The first P wave arrived Degan. 5. If the first P wave was recorded at 10:39 Y.Y. local time at the station in Figure 4.2, what was the local time at the epicenter when the earthquake began. (Hint: The earthquake began at the epicenter.) Y.Y. local time ACTIVITY 4.2B Locating an Earthquake Figure 4.5 shows seismograms for the same earthquake recorded at three locations-New York; Nome, Alaska; and Mexico City. Use this information to complete the following. 1. Use Figure 4.5 and the travel-time graph in Figure 4.4 to determine the distance between each station and the epicenter. Write your answers in Table 4.1. 2. Use Figure 4.6 and a drafting compass to draw a circle around each of the three stations. Make the radius (in miles) of each circle equal to the station's distance from the epicenter as determined above. (Use the scale on the map to set the radius on the drafting compass.) The circles you draw should intersect at approximately one point. This point is the epicenter. If they do not intersect at one point, find a point that is equidistant from the edges of the three circles and use this as the epicenter. Label the epicenter on the map. 3. What are the approximate latitude and longitude of the epicenter of this earthquake? Latitude: Longitude:w 4. The first P wave was recorded in New York at 9:01 EST. At what time (EST) did the earthquake actually occur? EST Figure 4.5 Seismograms of the same earthquake ecorded in three different cities. THREE SEISMOGRAMS Seismogram A - New York, NY 1 minute H Seismogram B- Nome, Alaska FIRST S WAVE Seismogram C-Mexico City, Mexico FIRST P WAVE cont
68 Applications and Investigations in Earth Science Activity 4.2B continued 170 at Table 4.1 Epicenter Data Table Elapsed time between first P waves and first S waves Distance from epicenter, in miles 180 170 40 160 50 0 150 500 60 140 1000 70 Nome 1500 130 120 110 3000 2000 NEW YORK 80 2500 A Figure 4.6 Map for locating an earthquake epicenter. 80 3500 Scale of miles NOME 70 Mexico City 100 90 4000 A 4500 60 P New York 80 5000 MEXICO CITY 50 70 5500 6000 60 50 B Longitude 40 30
Transcribed Image Text:68 Applications and Investigations in Earth Science Activity 4.2B continued 170 at Table 4.1 Epicenter Data Table Elapsed time between first P waves and first S waves Distance from epicenter, in miles 180 170 40 160 50 0 150 500 60 140 1000 70 Nome 1500 130 120 110 3000 2000 NEW YORK 80 2500 A Figure 4.6 Map for locating an earthquake epicenter. 80 3500 Scale of miles NOME 70 Mexico City 100 90 4000 A 4500 60 P New York 80 5000 MEXICO CITY 50 70 5500 6000 60 50 B Longitude 40 30
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