GEO1010 Activity on Earthquakes Locating Earthquake Epicenter 1. Four partial records of the same earthquake were...
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GEO1010 Activity on Earthquakes Locating Earthquake Epicenter 1. Four partial records of the same earthquake were recorded at Los Angeles, San Francisco, Salt Lake City, and Albuquerque, shown below. Determine the lag time for each recording station and enter it into the "lag time" column, by subtracting the P-wave arrival time from the S-wave arrival time. Recording Station Los Angeles San Francisco Salt Lake City Albuquerque P-wave arrival time 11:06-06 PST 11:06-46 PST 12:08-06 MST 12:08-45 MST P-waves took how many seconds? answer. S-wave arrival time 11:06-19 PST 11:07-18 PST 12:09-22 MST 12:10-15 MST 2. Assuming an average velocity of 3.80 miles/second for the P-waves, and 2.54 miles/second for the S-waves, how long does it take for each type to travel 100 miles? Show how you arrived at your S-waves took how many seconds? What is the lag time associated with this distance (100 miles)? Lag time? Recording Station Calculated Distance (miles)? Los Angeles: San Francisco: Albuquerque: Salt Lake City: seconds seconds seconds seconds 3. Determine the distance from each of the four seismograph stations to the epicenter of the earthquake. Distance may be computed by proportion, using the lag time value to 100 miles that you obtained in Problem 2. miles miles. miles miles 4. On the base map of the western United States (Figure 4), draw circles or arcs with a compass, locating the needle point at each of the four stations, with each radius corresponding to the calculated distance (use the graphic scale on the base map for measurement). Where is the epicenter located? Between what cities shown on the map? Which city is the earthquake epicenter closes to, and how far? 5. Considering the cause of earthquakes discussed during lecture, what major structural feature is probably related to this earthquake? 6. The time at which the P-wave arrived at each of the four stations is shown on the seismograph record (Problem 1). But when did the earthquake actually occur? Show how you obtained your answer. Son Francisco 0 100 Lo Los Angeles 200 300 400 500 Miles 0 Salt Lake City Figure 4: Base Map of western United States Albuquerque GEO1010 Activity on Earthquakes Locating Earthquake Epicenter 1. Four partial records of the same earthquake were recorded at Los Angeles, San Francisco, Salt Lake City, and Albuquerque, shown below. Determine the lag time for each recording station and enter it into the "lag time" column, by subtracting the P-wave arrival time from the S-wave arrival time. Recording Station Los Angeles San Francisco Salt Lake City Albuquerque P-wave arrival time 11:06-06 PST 11:06-46 PST 12:08-06 MST 12:08-45 MST P-waves took how many seconds? answer. S-wave arrival time 11:06-19 PST 11:07-18 PST 12:09-22 MST 12:10-15 MST 2. Assuming an average velocity of 3.80 miles/second for the P-waves, and 2.54 miles/second for the S-waves, how long does it take for each type to travel 100 miles? Show how you arrived at your S-waves took how many seconds? What is the lag time associated with this distance (100 miles)? Lag time? Recording Station Calculated Distance (miles)? Los Angeles: San Francisco: Albuquerque: Salt Lake City: seconds seconds seconds seconds 3. Determine the distance from each of the four seismograph stations to the epicenter of the earthquake. Distance may be computed by proportion, using the lag time value to 100 miles that you obtained in Problem 2. miles miles. miles miles 4. On the base map of the western United States (Figure 4), draw circles or arcs with a compass, locating the needle point at each of the four stations, with each radius corresponding to the calculated distance (use the graphic scale on the base map for measurement). Where is the epicenter located? Between what cities shown on the map? Which city is the earthquake epicenter closes to, and how far? 5. Considering the cause of earthquakes discussed during lecture, what major structural feature is probably related to this earthquake? 6. The time at which the P-wave arrived at each of the four stations is shown on the seismograph record (Problem 1). But when did the earthquake actually occur? Show how you obtained your answer. Son Francisco 0 100 Lo Los Angeles 200 300 400 500 Miles 0 Salt Lake City Figure 4: Base Map of western United States Albuquerque
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Authors: William G Zikmund, Barry J. Babin, Jon C. Carr, Mitch Griff
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