Table of Contents
What is the strike of an inclined rock surface?
Strike indicates the attitude or position of linear structural features such as faults, beds, joints, and folds. Dip is the angle at which a planar feature is inclined to the horizontal plane; it is measured in a vertical plane perpendicular to the strike of the feature.
What is a strike in geology?
Strike and dip refer to the orientation or attitude of a geologic feature. The strike line of a bed, fault, or other planar feature, is a line representing the intersection of that feature with a horizontal plane. Both vertical and level beds do not have a number written with them.
How do you determine a strike in geology?
To determine the strike, measure the angle between your constructed strike lines and the North direction on the map. In Figure 9, the strike is north-south (= 000◦ = 180◦). By definition, dip is perpendicular to strike, and by using the Rule of V’s (Figure 7) you can determine the direction of dip.
Is strike always north?
The intersection of two flat planes is a straight line, and in this instance, the line is geologic strike. According to convention, the compass direction (or bearing) of this line is always measured and referred to relative to north. The only exception to this north rule occurs where strike is exactly east-west.
What does the strike and dip of a rock represent quizlet?
What does the strike and dip of a rock represent? Dip is the angle of greatest inclination down from horizontal and strike is the angle from true north or true south of a horizontal line on the stratum.
What is strike in mining?
The terms ‘Strike’ and ‘Dip’ are used with geology and mining to define a plane for rock slope analysis. In more technical terms, strike is the direction of the line that is formed by the intersection of the plane of the rock bed with a horizontal surface. …
What is the difference between strike direction of dip and angle of dip?
The strike is the direction of intersection of an inclined surface with any horizontal plane (e.g., intersection of a bedding plane with a water surface as in Fig. 1). The dip angle is always in a vertical plane and is measured downward from the horizontal plane. The dip direction is always perpendicular to the strike.
How are strike and dip measured in rock layers?
The line of strike is represented by the water line when a lake intersects with the rock along the shoreline (Figure 8.7). The dip angle for the beds is measured from the horizontal surface to the uppermost dipping bed, perpendicular to the strike line.
How is strike and dip measured in geology?
The strike is measured by aligning the compass along a horizontal line on the surface of the feature (Figure 13.36, left). The dip is measured by turning the compass on its side and aligning it along the dip direction (Figure 13.36, right).
Which is the correct strike direction to record?
Some geologists prefer to record whichever strike direction is less than 180, and use letters (e.g. ‘NE’) to resolve the ambiguity. In this convention (‘strike, dip, alphabetic dip direction’) the above measurement would be written: Other geologists prefer to record dip direction and dip.
What is the strike, dip, and dip direction of a plane?
Strike, dip, and dip-direction of a plane. There are two directions in which we could measure the strike, 180° apart! The dip direction is clockwise from one, and counterclockwise from the other. In most Canadian geological field work, the (‘ RHR ‘) is used to avoid this ambiguity.
What kind of measurement is used in structural geology?
Another type of measurement is often used in structural geology: is an angle of slope measured downward relative to horizontal. Figure 2: Compass-clinometer used to measure an inclination – in this case the dip of a bedding plane.
What do you call a direction relative to North?
A direction relative to north is called a . In most geologic work, bearings are specified as s. An is a bearing measured clockwise from north. An azimuth of 000° represents north, 087° is just a shade north of east, 225° represents southwest, and 315° represents NW.