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Seismographs

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Subido el 28 de mayo de 2007 por EducaMadrid

110 visualizaciones

NASA Sci Files segment exploring how seismographs work and what they do.

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Hi, Dr. D. Hi, kids. 00:00:00
Is this the seismograph you're building? 00:00:04
That's right. I'm almost finished. 00:00:06
This seismograph is not very sensitive, but it does work. 00:00:08
It measures horizontal motion. 00:00:13
So you actually use a peanut can and an old brick? 00:00:15
Yeah, sure. Let me start from the beginning. 00:00:18
The seismograph measures the shaking of the Earth. 00:00:21
To measure the shaking, we take advantage of Newton's first law. 00:00:23
I think I remember. Isn't it also called inertia? 00:00:26
I'm impressed. So what is inertia? 00:00:29
It means that when an object is at rest, it stays at rest. 00:00:32
And when an object is in motion, it remains in motion. 00:00:35
That's right. This brick has a lot of inertia, so it's hard to get moving. 00:00:37
When the Earth shakes, the base of the seismograph will also shake. 00:00:41
But the brick, which is not tied to the base, will not. 00:00:46
The can over there records the vibration. 00:00:49
Can we try it? 00:00:51
Sure. Let's make an earthquake by shaking the table. 00:00:53
It really works. Look at the waves. Did we do that? 00:00:56
You sure did. 00:01:00
Here's a different kind of seismograph. It measures vertical motion. 00:01:02
It looks really different. 00:01:06
Because it has inertia, this magnet hanging on the spring tends to stand still when the table moves up and down. 00:01:09
A magnet moving through a coil of wire produces electricity, which this meter records. 00:01:16
Can we try this one too? 00:01:20
Sure. 00:01:22
All right. But here's a sense of the seismometer that hooked up to this computer. 00:01:25
That graph looks a lot like the seismogram that Mr. Lau showed us. 00:01:29
The harder I hit the table, the larger the signal. This is really cool. 00:01:41
And look at how it vibrates up and down. 00:01:45
Because it produces an electric signal, it is easy to amplify. 00:01:48
Even a small vibration can be shown on the computer. 00:01:51
Now, I can't loan you this device. 00:01:54
But why don't you take my wooden seismograph back to the treehouse and see if it can record another tremor? 00:01:57
I have a friend at NASA's Jet Propulsion Laboratory in Pasadena, California. 00:02:03
He uses satellites to measure the motion of the Earth's crust. 00:02:07
You might want to talk to her in your quest to become earthquake experts. 00:02:10
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Idioma/s:
en
Niveles educativos:
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      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
110
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 15″
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:
13.61 MBytes

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