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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
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Determining the Earthquake Distance You can now determine the distance from each seismic recording station to the earthquake's epicenter using the known times of travel of the S and P waves. S-Wave 80 Examine the graph to the right, a graph of seismic wave travel times. There are three curves on the graph: The upper curve shows S wave travel-time graphed versus distance, the center one shows P wave travel time versus distance, and the lower P-Wave 70 one shows the variation in distance with the difference of the S and P travel times. It takes an S wave approximately 60 70 seconds to travel 300 kilometers. S-P O 50 For practice, how long does it take the P wave to travel this same distance? 40 For the rest of this exercise you won't be needing the individual S and P curves, only the S-P curve. 30 To determine the epicentral distance, we need greater resolution on graph. We will use the graph below, which shows an expanded part of the S-P curve. 20 10 100 200 300 400 500 600 700 800 Distance (Kilometers) Time (Seconds)
Transcribed Image Text:Determining the Earthquake Distance You can now determine the distance from each seismic recording station to the earthquake's epicenter using the known times of travel of the S and P waves. S-Wave 80 Examine the graph to the right, a graph of seismic wave travel times. There are three curves on the graph: The upper curve shows S wave travel-time graphed versus distance, the center one shows P wave travel time versus distance, and the lower P-Wave 70 one shows the variation in distance with the difference of the S and P travel times. It takes an S wave approximately 60 70 seconds to travel 300 kilometers. S-P O 50 For practice, how long does it take the P wave to travel this same distance? 40 For the rest of this exercise you won't be needing the individual S and P curves, only the S-P curve. 30 To determine the epicentral distance, we need greater resolution on graph. We will use the graph below, which shows an expanded part of the S-P curve. 20 10 100 200 300 400 500 600 700 800 Distance (Kilometers) Time (Seconds)
Determining Distance from S-P 70 Use the S-P graph to the left and the estimates you made for the S-P time intervals for the three seismograms (shown again for your convenience) to complete the table below. The horizontal grid is in one second intervals. Then click the Find Epicenter button. 60 Station S-P Interval Epicentral Distance Chichuahua 55 seconds KM 50 Mazatlan 25 seconds KM Rosarito 45 seconds KM 40 Find 30 300 Epicenter 400 500 600 700 Distance (kilometers) Time (Seconds)
Transcribed Image Text:Determining Distance from S-P 70 Use the S-P graph to the left and the estimates you made for the S-P time intervals for the three seismograms (shown again for your convenience) to complete the table below. The horizontal grid is in one second intervals. Then click the Find Epicenter button. 60 Station S-P Interval Epicentral Distance Chichuahua 55 seconds KM 50 Mazatlan 25 seconds KM Rosarito 45 seconds KM 40 Find 30 300 Epicenter 400 500 600 700 Distance (kilometers) Time (Seconds)
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