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Published byEmery Perkins Modified over 9 years ago
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Lab 4-5: Finding Epicenters
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2:33:002:35:30 00:02:302:35:30 – 2:33:00 =
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2:35:102:39:20 00:04:102:39:20 – 2:35:10 =
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2:32:102:34:00 00:01:502:34:00 – 2:32:10 =
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Let’s put the lab on pause for now…
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How to use the P & S Wave Chart
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We don’t know when the EQ started. But we know how much time there was between the P&S wave arrivals. Let’s say 0:04:00 C’mon let’s say it!
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We have to find a spot on the graph where P&S (careful!) are separated by 4:00.
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Then drop straight down to see the distance to the epicenter. 2,600km
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Now that we know the EQ was 2,600km away, when did it start? To travel 2,600km, a P-wave… needs 5:00 minutes
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Back to the lab… The difference in arrival time for Chicago is 0:02:30. That means that Chicago is ______ km from the epicenter. 1,400
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Now that we know the EQ was 1,400km away, when did it start? To travel 1,400km, a P-wave… needs 3:00 minutes
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If the P-wave was detected at 2:33:00 and needed 3:00 minutes to travel it must have started at… 2:33:00 -3:00 2:30:00
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1,400km
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The EQ happened somewhere on this line
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Now work on the rest of the lab.
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