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Triangulation Activity
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NASA Sci Files segment involving students in an activity that studies how to locate an earthquake's epicenter by using triangulation.
Hi, we're from Mr. Darrell Ransom's 3rd grade class at Roberts Park Elementary School in North of Virginia.
00:00:00
Hi, we're the Treehouse Detectives and we see you're doing an activity to find out where an earthquake occurred.
00:00:10
Could you tell us something about it?
00:00:14
Sure. Our mentors from the Society of Women Engineers helped us with the activity called triangulation.
00:00:16
It must have something to do with threes.
00:00:24
Yes, we learned that in order to find the origin or epicenter of an earthquake, we needed data from three different seismic stations.
00:00:26
Did you need any special materials?
00:00:36
No, just a world map, a seismogram, a graph, and a drawing compass.
00:00:38
What did you do next?
00:00:44
First, we looked at the seismic recordings and determined when the S and P waves each arrived at the seismic stations.
00:00:46
How could you tell which one was which?
00:00:55
We know the P waves travel faster and arrive first.
00:00:57
We then found the difference between the two times in seconds.
00:01:02
For example, at the Denver, Colorado station, the P waves arrived at 10 hours and 16 minutes and the S waves arrived at 10 hours, 18 minutes, and 30 seconds.
00:01:06
I know, the difference was 2 minutes and 30 seconds.
00:01:18
That's correct. We then used the graph to mark off 2 minutes and 30 seconds along the edge of the piece of paper.
00:01:21
We slid the paper along the graph between the S waves and the P waves to find the distance in kilometers that the waves had traveled.
00:01:28
How far did the waves travel?
00:01:36
About 1600 kilometers. After finding the distance the waves traveled, we located the city on the map.
00:01:38
We used the map scale and our drawing compass to measure that distance.
00:01:47
We placed the point of our compass on the city and drew a circle.
00:01:52
Why a circle?
00:01:57
We know that the earthquake occurred 1600 kilometers from Denver, but that could be 1600 kilometers in any direction.
00:01:59
So we used 1600 kilometers as our radius, and the earthquake occurred somewhere along the circle.
00:02:07
How do you pinpoint the location?
00:02:16
We repeated the steps with the next seismic recording for Terre Haute, Indiana.
00:02:18
But the two circles intersect at two different points. How can you tell which one is the epicenter?
00:02:24
That's why you need a third seismic station.
00:02:29
Once all three stations are plotted on the map, you find where the three circles intersect.
00:02:32
The intersection is the approximate epicenter of the earthquake.
00:02:38
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 225
- Fecha:
- 28 de mayo de 2007 - 15:33
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 02′ 43″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 480x360 píxeles
- Tamaño:
- 16.44 MBytes
