things found using the chart travel time – time a seismic wave takes to travel from epicenter to...
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![Page 1: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/1.jpg)
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Things found using the Chart
• Travel time – time a seismic wave takes to travel from epicenter to city (seismic station).
• Epicenter distance – The distance in kilometers (km) between the city and the epicenter (radius of the circle drawn on map).– When given or using the travel time for one wave
to travel the distance.– When given or using Difference in arrival time
between P & S waves (lag time).
![Page 3: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/3.jpg)
Notice the vertical axis
This represents TIME (in minutes!)
Let’s enlarge a small section
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Between each minute, we notice that there are 3 segments.
If there are 60 seconds in a minute, each one of these segments must be ________seconds.
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What would this time be?
![Page 6: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/6.jpg)
Notice the horizontal axis
This represents DISTANCE (in thousands
of Kilometers!)
Let’s enlarge a small section
![Page 7: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/7.jpg)
![Page 8: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/8.jpg)
There are also two curves on this chart that display the way different earthquake waves behave.
![Page 9: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/9.jpg)
![Page 10: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/10.jpg)
This chart can be used for answering many different questions!
How long does it take an S-Wave to travel 5,000km(travel time)?
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![Page 12: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/12.jpg)
The recording station at a city tells us it took 6 minutes and 20 seconds for the P-Wave to reach that city. How far away from the epicenter (epicenter distance) must the seismograph in this city be?
![Page 13: Things found using the Chart Travel time – time a seismic wave takes to travel from epicenter to city (seismic station). Epicenter distance – The distance](https://reader036.vdocument.in/reader036/viewer/2022062518/56649f1c5503460f94c31c69/html5/thumbnails/13.jpg)
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I know that there was a 7 minute difference in the arrival of my P and S waves. How far away from the epicenter must I be?
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Mark off 7 minutes on scrap paper…
Slide your scrap paper up until the tick marks match up with the curves…