working with the p-wave and s-wave chart
DESCRIPTION
Working With the P-Wave and S-Wave Chart. 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). - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/1.jpg)
![Page 2: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/2.jpg)
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: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/3.jpg)
Notice the vertical axis
This represents TIME (in minutes!)
Let’s enlarge a small section
![Page 4: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/4.jpg)
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.
![Page 5: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/5.jpg)
What would this time be?
![Page 6: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/6.jpg)
Notice the horizontal axis
This represents DISTANCE (in thousands
of Kilometers!)
Let’s enlarge a small section
![Page 7: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/7.jpg)
![Page 8: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/8.jpg)
There are also two curves on this chart that display the way different earthquake waves behave.
![Page 9: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/9.jpg)
![Page 10: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/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)?
![Page 11: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/11.jpg)
![Page 12: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/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: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/13.jpg)
![Page 14: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/14.jpg)
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?
![Page 15: Working With the P-Wave and S-Wave Chart](https://reader036.vdocuments.net/reader036/viewer/2022062721/5681377a550346895d9f1226/html5/thumbnails/15.jpg)
Mark off 7 minutes on scrap paper…
Slide your scrap paper up until the tick marks match up with the curves…