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Horsts and Grabens

A cache by AD0OR Send Message to Owner Message this owner
Hidden : 1/31/2008
Difficulty:
1 out of 5
Terrain:
1 out of 5

Size: Size: other (other)

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Geocache Description:


Welcome to Joe's Valley, a 75-mile long, north-south trending depression graben, what's a graben you ask?

Horsts and Grabens

A graben is a depressed block of land bordered by parallel faults. Graben is German for ditch.

A graben is the result of a block of land being downthrown producing a valley with a distinct scarp on each side. Grabens often occur side-by-side with horsts. Horst and graben structures are indicative of tensional forces and crustal stretching.

Graben are produced from parallel normal faults, where the hanging wall is downthrown and the footwall is upthrown. The faults typically dip toward the center of the graben from both sides. Horsts are parallel blocks that remain between grabens, the bounding faults of a horst typically dip away from the center line of the horst.

A single graben or multiple grabens can produce a rift valley.


Block Diagram

Horst diagram


(Horsts are up thrown blocks bounded on either side by parallel normal faults.)

Graben diagram


(Grabens are downthrown blocks bounded on either side by parallel normal faults.)

Half-Graben

Half-grabens develop when parallel faults on either side of a block develop, but the block becomes tilted instead of dropping down as in a graben.

Logging Requirements:
(answers can be found at the coordinates)

  • In the diagram, what do the green bands represent?
  • How far has Joe's Valley dropped in it's becoming a graben?
  • Which nearby graben is most prominent? did you know it was a graben? do you know of any other grabens?
  • (optional) Include a photo in your online log of you at the cache site with your GPS.

Visit Horsts and Grabens details at the DGP

Additional Hints (No hints available.)



 

Find...

347 Logged Visits

Found it 337     Didn't find it 2     Write note 2     Needs Archived 2     Temporarily Disable Listing 1     Publish Listing 1     Needs Maintenance 1     Owner Maintenance 1     

View Logbook | View the Image Gallery of 135 images

**Warning! Spoilers may be included in the descriptions or links.

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Rendered From:Unknown
Coordinates are in the WGS84 datum

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