normal or reverse? looking at the two types of vertical displacement in dip-slip faults using the...
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![Page 1: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/1.jpg)
Normal or Reverse?
Looking at the two types of vertical displacement in dip-slip faults using
the hanging wall method
![Page 2: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/2.jpg)
Terminology
An easy method to decide what sort of dip-slip fault we have uses the old mining terms of:
Hanging walland
Footwall
![Page 3: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/3.jpg)
The footwall is always underneath the fault
fault
fault
The hanging wall is always on top of the fault
These names do not need us to know which side has moved up or down or if a tension or compression has occurred
Hanging wall
Footwall
![Page 4: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/4.jpg)
Hanging Wall
Footwall
1 km
We apply this to the fault we looked at in the introduction to faults.
Hanging wall
Footwall
faul
t
The block above the fault plane is the hanging wall, and the block below the fault is the footwall.
![Page 5: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/5.jpg)
Draw arrows to show the relative movement on either side of the fault.⇃↾
Hanging wall
Footwall
![Page 6: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/6.jpg)
This makes F N ! U
Is the footwall the upthrow side or downthrow side of the fault?
Footwall
Hanging wall
The arrow points up, it must be the upthrow side.
Upthrow
Footwall
This is a normal fault.
Upthrow
Normal
⇃↾
F
U
N
![Page 7: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/7.jpg)
Normal faults are caused by a pulling apart motion (tension).
Hanging wall
Upthrow
Footwall
⇃↾
![Page 8: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/8.jpg)
Another example
![Page 9: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/9.jpg)
1 km
Two interpreted horizons.
Two faults.
The block above the fault plane is the hanging wall, and the block below the fault is the footwall.
Look at the fault in the NW.
Hanging wall
Footwall
![Page 10: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/10.jpg)
1 km
Hanging wall
Footwall
Draw arrows to show the relative movement on either side of the fault.
⇃↾
![Page 11: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/11.jpg)
1 km
Hanging wall
Footwall
Is the footwall the upthrow side or downthrow side of the fault?
The arrow points down, it must be the downthrow side.
Footwall
Downthrow
This does not make FUN!
This is a reverse fault.
⇃↾
![Page 12: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/12.jpg)
1 km
Hanging wall
Footwall
Reverse faults are caused by a pushing together motion (compression).
⇃↾
![Page 13: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/13.jpg)
1 km
Try the other fault.
The block above the fault plane is the hanging wall, and the block below the fault is the footwall.
Hanging wall
Footwall
![Page 14: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/14.jpg)
1 km
Hanging wall
Footwall
Draw arrows to show the relative movement on either side of the fault.
↿⇂
![Page 15: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/15.jpg)
1 km
Hanging wall
Footwall
↿⇂
Is the footwall the upthrow side or downthrow side of the fault?
The arrow points down, it must be the downthrow side.
Footwall
Downthrow
This does not make FUN!
This is a reverse fault.
![Page 16: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/16.jpg)
1 km
Hanging wall
Footwall
↿⇂
Reverse faults are caused by a pushing together motion (compression).
![Page 17: Normal or Reverse? Looking at the two types of vertical displacement in dip-slip faults using the hanging wall method](https://reader035.vdocument.in/reader035/viewer/2022062308/56649ccc5503460f94995dc6/html5/thumbnails/17.jpg)
1 km
↿⇂
There are many more faults on this seismic profile.
Click to see a few suggestions.
Do you agree?
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