What is the travel time in seconds for a P wave that arrives 200 km from the epi

Question

What is the travel time in seconds for a P wave that arrives 200 km from the epicenter? Just give the number and no units t Lab 7-Earthquakes ll Earthquake Distance Using the lag time (Ts-p) determined from part one and the travel-time vs. distance curve (Figure 7-7) determine the distance from the seismic station to the focus of the earthquake. The distance is determined by using Figure 7-7 and marking that lag time (24 seconds) on the time scale (y-axis). Next, use a scrap piece of paper and mark off the length of the line (24 seconds). Match that exact length between the P and S wave curves to get the distance (again, keep the length vertical and stay between the P wave and S wave curves) Once the length of the line fits exactly between the two curves, read the distance in kilometers from the distance scale (x-axis). * In this example, 24 seconds is equal to 210 km. Therefore, the seismic station is 210 km from the earthquake. 70 U 50 30 20 10 o 10 20 30 40 s0 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200210 EPICENTRAL DISTANCE IN KILOMETERS Figure 7-7. Travel Time vs. Distance graph

Explanation / Answer

Measuring the distance in the graph. Marking the 200 km position and measuring the distance. The distance measured is 17.6. Therefore the time travelled by P wave from epicenter is 17.6

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