What does a stereonet show?
A stereonet allows the stereographical projection of three-dimensional information onto a two-dimensional plane (usually as a piece of paper or computer image) and is used as a tool applied to a range of geological problems including the removal of structural tilt.
How do you find the axial plane of a stereonet?
The next thing we can do is find the axial plane. And we do this by dividing the spread of the poles.
How do you find the Lineation of a stereonet?
31 azimuth of 256 degrees so first all we find the azimuth around the outside of the stereo net and mark it with a line. So at 180 here 190 200 10 20 30 40 to 50 to 56.
What is a pole in a stereonet?
The pole is a line running through the center of the projection sphere and perpendicular to the plane (fig. 2-9). The pole forms a 90° angle with the strike line and a 90° angle with the dip line. Thus, the pole will always be found in the opposite quadrant of the stereonet from the dip of the plane.
How do you plot a Stereonet?
Stereonet: plotting a plane – YouTube
How do you find a strike and dip on a Stereonet?
Stereonet clip 9 – True dip – YouTube
What is overturned fold?
An overturned fold, or overfold, has the axial plane inclined to such an extent that the strata on one limb are overturned. A recumbent fold has an essentially horizontal axial plane.
How do you plot poles to planes on a stereonet?
How to plot poles to planes – YouTube
How do you plot pitch on a stereonet?
Stereonet clip 5 – Line as pitch – YouTube
How do you find a strike and dip on a stereonet?
What is a friction angle on a stereonet?
It is required to examine the stablilty of a slope face with a dip of 50° and dip direction of 120°. A friction angle of 30° is assumed for this analysis.
How do you plot dip and dip on a stereonet?
When plotting the plunge of a line, you counted inward on the line that connects North- South. However, the dip direction is 90° away from the strike direction. If your plane is east-dipping, count grid squares inward from the East side of the straight line that connects East-West on the stereonet.
How do you plot poles on a Stereonet?
Stereonet clip 3 – Plotting a plane as a Pole – YouTube
How do you plot points on a Stereonet?
Stereonet clip 4 – Lines as points – YouTube
What are overturned beds?
Overturned Fold: beds on one limb are upside down.
How is overturned fold created?
Motion along the fault including both shortening and extension of tectonic plates, usually also deforms strata near the fault. This can result in an asymmetrical or overturned fold.
How do you plot a trend and plunge on a stereonet?
Stereonet: plotting the trend and plunge of a line. – YouTube
How do you find the dip direction in a Stereonet?
How do you find the dip direction in a stereonet?
What is plunge on stereonet?
The plunge refers to the angle (down) from the horizontal at which the line is tilted (in Fig. 3.3a, the pen symbolizes a line). Plot the line 315°/45°. Lines appear as dots on the stereonet.
How do you know if your bed is overturned?
So: if you have a steeply-dipping bed cut by more-shallowly-dipping cleavage, pay attention to the direction of the cleavage’s dip: (a) If it is dipping in the opposite direction as bedding, your fold is upright or asymmetric. (b) If your bedding and cleavage are dipping in the same direction, your fold is overturned.
What causes overturned fold?
If the fold is sufficiently tilted that the beds on one side have been tilted past vertical, and are sloping in the same direction, the fold is overturned (Figure 13.12). It is possible for rocks to be folded so tightly that the fold limbs are nearly parallel. Folds with parallel limbs are called isoclinal folds.
What does it mean for a fold to be overturned?
In an overturned fold, the beds dip in the same direction on both sides of the axial plane because one of those limbs being rotated through an angle of at least 90º. An extreme example of an overturned fold occurs when the axial plane is horizontal – this is called a recumbent fold.
How do you calculate trend and plunge?
Stereonet: determining the trend and plunge of a plotted line. – YouTube
What’s the difference between plunge and dip?
Plunge is the vertical angle between the horizontal plane and the axis or line of maximum elongation of a feature. Plunge is measured along the axis of a fold, whereas dip is measured along the limbs.