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Co-op Classes: Earthquakes

4/14/2016

 
I've developed a reputation for doing hands-on interesting classes with my co-op, having this reputation isn't always a good thing.... means I need to think about what I want to do!

This time around I wanted to do hands-on STEM type stuff but didn't really have a clue about what I really wanted to do with it.    Week two has me doing earthquakes.
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What types of Earthquakes are there?    Four Kinds
  • A tectonic earthquake is one that occurs when the earth's crust breaks due to geological forces on rocks and adjoining plates that cause physical and chemical changes.
  • A volcanic earthquake is any earthquake that results from tectonic forces which occur in conjunction with volcanic activity.
  • A collapse earthquake are small earthquakes in underground caverns and mines that are caused by seismic waves produced from the explosion of rock on the surface.
  • An explosion earthquake is an earthquake that is the result of the detonation of a nuclear and/or chemical device.
If you want to know more about how earthquakes form check out this page.
What kind of faults are there?
  •  Normal faults form when the hanging wall drops down. The forces that create normal faults are pulling the sides apart, or extensional.  (Divergent)
  • Reverse faults form when the hanging wall moves up. The forces creating reverse faults are compressional, pushing the sides together. (Convergent)
  •  Transcurrent or Strike-slip faults have walls that move sideways, not up or down.  (Transform)
Check out this site to see an easy way to demonstrate.   This site talks a bit more about the different types of faults.
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What are the levels of earthquakes?
  1. Shallow fault earthquakes

    A fault is a break in the rock beneath our feet. Shallow fault quakes occur very close to the surface. . Because shallow fault earthquakes are so near the surface, even small ones cause a lot of damage from shaking.

  2. Subduction zone earthquakes

    The largest earthquakes ever recorded are subduction zone earthquakes. They can last several minutes. Subduction zone shaking can occur along the whole subduction zone. In the Pacific Northwest, these major quakes seem to occur every few hundred years. These earthquakes can also cause huge waves— tsunamis—.

  3. Deep earthquakes

    Deep earthquakes occur in the subducting ocean slab, deep beneath the continental crust. In the Pacific Northwest, deep quakes start about 50 km (30 mi) beneath the surface. Large ones have shaken the Pacific Northwest in 1949, 1965, and 2001—about every 30 years.  (source)  (also here)
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How are earthquakes measured?
The Richter scale is used to rate the magnitude of an earthquake -- the amount of energy it released. This is calculated using information gathered by a seismograph.

The extent of damage is rated on the Mercalli scale. Mercalli ratings, which are given as Roman numerals, are based on largely subjective interpretations. A low intensity earthquake, one in which only some people feel the vibration and there is no significant property damage, is rated as a II. The highest rating, a XII, is applied to earthquakes in which structures are destroyed, the ground is cracked and other natural disasters, such as landslides or tsunamis, are initiated.  (source)
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Some Activities we are going to do.

See how FOLD mountains are made because of the earth moving.
Earthquake waves.
This on-line seismic simulation.
Watch a seismic shadow simulation.
Build towers to see how well they survive our shake Table.

If I was doing this for a longer period of time I'd make this seismograph.
I thought this activity looked cool but couldn't figure out how to make it.
Kym link
4/15/2016 09:42:08 am

I remember making a very simple seismograph and doing a shake table when my kids were younger. I think our ideas came from the God's Design book on geology. Looks like a very cool co-op class!!

annette @ A net in Time
4/15/2016 11:01:08 pm

The children seemed to enjoy the class.

Kim link
4/17/2016 09:05:35 am

It looks like the kids had a lot of fun! Thanks for sharing the activity links I can't wait to try them out with my kids to.

annette @ A Net In time
4/17/2016 01:13:52 pm

My pleasure to share. No point in not sharing right?

Renee K link
4/18/2016 07:59:56 am

How fun my kids would love this. I will have to try this one time.'

Thanks for stopping by my blog. I actually bought a comb binder. I added it into my homeschool budget a few years ago. They are actually not to pricey for a small one. I bought a bunch of the combs when I bought it in bulk to save on cost.

annette @ A net in time
4/18/2016 10:41:56 am

I can see the advantages in having your own.

Alison link
4/18/2016 11:58:50 am

Sounds like you are a great asset to your co-op community Annette! I'm sure the kids had fun!

annette @ a net in time
4/18/2016 10:52:12 pm

They did have fun. The only thing I would do differently is provide better instructions about how to make a building.

Leah Courtney link
4/18/2016 12:55:27 pm

I need to save this because we're doing earth science next year. :-)

annette @ a net in time
4/18/2016 10:49:43 pm

I'm glad I could be helpful. :)

Nelleke link
4/19/2016 12:02:50 pm

Sounds like fun!


Comments are closed.

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