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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment explaining the Global Positions System and how it monitors and measures crustal movement.

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Hi, we're the Treehouse Detectives. 00:00:00
Dr. D said that you might be able to help us learn about how crustal movement is monitored. 00:00:02
I sure can. I use GPS to measure crustal movements. 00:00:06
I've heard of GPS, but I'm not sure what it is or how it works. 00:00:09
GPS stands for Global Positioning System. 00:00:13
It's a satellite navigation system consisting of 24 satellites. 00:00:16
Pilots and boaters use it to plot their course. 00:00:19
Geologists use it to accurately measure the position of monitoring stations. 00:00:22
Here in Southern California, we have a network of 250 GPS stations. 00:00:27
How does knowing the position of these stations help you to understand earthquakes? 00:00:31
It shows us the stretching, warping, and movement of the crust that's not really noticeable. 00:00:35
How accurate is it? 00:00:39
We can measure the positions of points on the Earth to 3 millimeters horizontally and 7 millimeters vertically. 00:00:41
That's small. How does that differ from what a seismograph does? 00:00:46
A seismograph measures earthquakes when they happen. 00:00:50
With GPS, we can actually measure the quiet motions of the Earth. 00:00:53
That means we can measure the strain buildup as well as the earthquakes themselves. 00:00:56
It is particularly useful in identifying active blind faults. 00:01:00
What's a blind fault? 00:01:03
A blind fault is a break in the crust that doesn't break through the surface anywhere. 00:01:05
Naturally, these faults are not easy to locate or study and might go unnoticed without GPS technology. 00:01:09
That's pretty impressive. I'm glad we have the ability to see these faults. 00:01:14
Would this technology help us to predict earthquakes? 00:01:18
We are integrating data from a lot of different sources into computer simulations. 00:01:21
These simulations should help us understand the earthquake process. 00:01:25
We hope to eventually be able to do short-term forecasting. 00:01:28
Can you give us an example? 00:01:31
By monitoring all the stations, we can find out which faults have the greatest slip rate. 00:01:33
The slip rate, typically measured in millimeters per year, is how fast the two sides of a fault are moving past each other. 00:01:37
These faults that have the greatest slip rates may be the locations of future earthquakes. 00:01:43
I wish you were able to make a prediction now. 00:01:47
Can GPS help us to know if we experience an earthquake in Virginia? 00:01:49
We can use GPS to measure displacements from earthquakes, but we don't measure the shaking part from an earthquake. 00:01:53
A seismometer is used to measure this, and it will be better able to answer your question. 00:01:58
Thank you very much, Dr. Donilon. 00:02:02
You're welcome. Email me if you have any questions, and say hello to Dr. D for me. 00:02:04
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Idioma/s:
en
Niveles educativos:
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Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
349
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 09″
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:
13.05 MBytes

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