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Seismology

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment explaining the study of seismology and how seismologists study eartquakes.

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This must be a seismograph. I recognize it from TV. I wonder if Mr. Lyle is here. 00:00:00
Oh, hi, Mr. Lyle. 00:00:06
Hi, girls. 00:00:08
We're the Treehouse Detectives. We called you about an earlier tremor. 00:00:09
Now we need to know if you've recorded anything on your seismograph today. 00:00:12
As a matter of fact, we did, and here it is right here. 00:00:15
Wow! Was that an earthquake? Can you really tell from that reading? 00:00:18
We're not sure at this time. We're analyzing the data because not all detected tremors are related to earthquakes. 00:00:22
Analyzing your data is very important in the scientific process. 00:00:28
In this area, most of the tremors we detect are relatively small, travel a short distance, and generally occur between 8 a.m. and 5 p.m. 00:00:32
This suggests that they're caused by human conditions. 00:00:39
We learned that there are earthquakes because there are breaks in the Earth's crust that are moving along fault lines. 00:00:42
Are there faults in Virginia? 00:00:46
Yes, there are numerous faults in Virginia, but not all of them are active faults. 00:00:48
Wow! Does Virginia have a lot of earthquakes? 00:00:52
Not really. In the last 30 years, there have been more than 150 earthquakes in Virginia. 00:00:55
But these are low-intensity events seldom felt by people. 00:01:00
Where do most Virginia earthquakes occur? 00:01:03
Most seem to occur in the central and western part of the state. 00:01:06
We don't live near that part of the state. 00:01:09
Hmm. What other things could cause a reading on your seismograph? 00:01:11
Anything that shakes the ground can be recorded. 00:01:14
Here's a seismogram, or paper recording, of that construction blast from the other day. 00:01:17
It looks so small, but it created such a big boom. 00:01:21
Our seismometer measuring instrument is very sensitive. 00:01:24
This is what automobile traffic and even storm waves from the beach look like. 00:01:27
That's pretty neat. 00:01:31
The seismometer is buried 70 meters below us. 00:01:33
It is so sensitive that we had to put it in a very quiet place. 00:01:36
That's way down there. 00:01:39
Would you like to see a seismogram of a confirmed earthquake? 00:01:41
Yes. 00:01:44
What are the little square marks? 00:01:45
How can you figure anything out? 00:01:47
You guys have lots of questions. 00:01:49
Well, every square ticks off a minute. 00:01:53
Oh, so you can tell when an earthquake happens and how long it lasts. 00:01:55
That's correct. 00:01:59
To most people, these look like squiggly lines, but when I look at them, I see S and P waves. 00:02:00
Like sound waves. 00:02:05
They are somewhat like sound waves. 00:02:06
These are vibrations in the earth. 00:02:08
That doesn't look at all like the tremor we felt. 00:02:10
Does that mean it wasn't an earthquake? 00:02:13
Not necessarily. 00:02:15
A local earthquake could look very different from this. 00:02:16
Let's put one of these in our treehouse. 00:02:19
Then we can measure the next tremor. 00:02:20
I think Dr. D is down the hall building a seismograph. 00:02:22
Dr. D, a seismograph? 00:02:24
We're there. 00:02:27
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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:
343
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 29″
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:
15.02 MBytes

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