Lab 3

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Broward College *

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1010

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Geology

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Jul 2, 2024

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docx

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Uploaded by Sanjay21

Physical Geology 3/14/20 Lab 3.2: Earthquakes (Seismology) Seismograph Station P Wave Arrival Time S Wave Arrival Time Difference in Arrival Time (S- P) Distance from Epicenter (km) A 2:11:20 2:16:35 05:15 3500 B 2:10:35 2:15:30 04:55 3000 C 2:08:50 2:12:30 03:40 2000 D 2:08:00 2:11:00 03:00 1500 E 2:07:00 2:09:15 02:15 1000 1.What do the circles around each station represent? The circles represent the distance, but not the direction, from the station to the epicenter of the earthquake. 2.a) Which seismograph station was closest to the earthquake? Station E was the closest seismograph station to the earthquake. b) What does this have to do with P and S waves? Since primary waves travel faster than secondary waves, seismologists can use this difference in speed to govern the distance from a specific seismograph station to an earthquake’s epicenter. On the seismogram for each station, the arrival of the first P waves is where you start measuring. You start at the arrival time of the first P wave and measure to when the arrival of the first S waves. That time pause can then be translated to a distance using the steps in this exercise. 3.a) Which station was farthest away from your earthquake? Station A was the farthest seismograph station to the earthquake. B) Again, what does this have to do with P and S waves? As the P and S waves travel out from an earthquake the P waves get progressively farther ahead of the S waves. Therefore, the farther a seismic recording station is from the earthquake epicenter the greater will be the difference in time of arrival between the P and S wave. 4.Which state was the epicenter of your earthquake located? The epicenter of the earthquake was in the state of Washington. 5.Please explain (as if you were teaching a group of students) how you determined the
epicenter by using the data. The way to determine the epicenter of an earthquake by using the data is to first figure out what time the P=Pressure waves and the time of the S= Shear waves of each station, when you find out time of both waves minus the two numbers. After getting an answer generate a graph to figure the distance of each station to the earthquake. After finding out the distance draw circles around each station founded on the distance you figured out. After finding and circling each stations distance look at where all the circles encounter and that’s the epicenter. 6. PASTE IN IMAGE OF EPICENTER or UPLOAD IT SEPARATELY
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