strike, in geology, direction of the line formed by the intersection of a fault, bed, or other planar feature and a horizontal plane. … 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 strike in geography?

Strike is a representation of the orientation of a tilted 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. The strike of the feature is the azimuth (compass direction) of the strike line.

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 a geological strike and dip?

Strike refers to the line formed by the intersection of a horizontal plane and an inclined surface. Dip is the angle between that horizontal plane (such as the top of this block) and the tilted surface (the geologic contact between the tilted layers). In Figure 12.8, look at the tilted sedimentary layers.

How do you find a strike?

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.

How do geologists measure strike and dip?

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).

What is strike in earthquake?

strike-slip fault, also called transcurrent fault, wrench fault, or lateral fault, in geology, a fracture in the rocks of Earth’s crust in which the rock masses slip past one another parallel to the strike, the intersection of a rock surface with the surface or another horizontal plane.

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. Downward-facing fold, that has older rock in its core.

What is the strike and dip symbol?

Geologists use a special symbol called strike and dip to represent inclined beds (Figure 2). Strike and dip map symbols look like the capital letter T, with a short trunk and extra-wide top line. The short trunk represents the dip and the top line represents the strike.

Why is strike and dip important?

Measurement of strike and dip (i.e., the attitude of rock layers or other planar geologic features) helps geologists construct accurate geologic maps and geologic cross-sections. For example, data on rock attitudes helps delineate fold structures in layered rocks.

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What is strike length in mining?

Strike length means the longest horizontal dimensions of a body or zone of mineralization. “Stripping ratio” means the ratio of waste material to ore that is experienced in mining an ore body. … Strike length means the longest horizontal dimensions of a body or zone of mineralization.

What is the right hand rule in geology?

Right-Hand rule: rather than reading the strike to a north quadrant (NE: 0-90; NW: 270-360) the strike trend is recorded in the azimuth direction such that the true dip (incline) of the plane is to the observers right. This removes the need for a quadrant direction for the dip.

What is trend and plunge in geology?

Trend – the direction of a line on a horizontal plane. We use the azimuth of a line to define its trend. … Plunge (inclination) – the vertical angle, measured downward, between the horizontal and a line.

What is apparent dip in geology?

Apparent dip is the angle between the horizontal and a planar or tabular geologic feature such as a bed, fault or vein as seen in a structure section.

What boundary causes strike-slip faults?

Strike slip systems are relatively narrow and subvertical wrench zones along which two adjacent blocks move sideways, horizontally, parallel to the strike of the fault zone. For example, they are produced at transform plate boundaries where plates horizontally slide past one another.

What forces cause faults?

2. Figure 10.6: Faults can form in response to any one of the three types of forces: compression, tension and shear: The type of fault produced, however, depends on the type of force exerted. 3. A fault plane divides a rock unit into two blocks.

Why does strike-slip fault occur?

The cause of strike-slip fault earthquakes is due to the movement of the two plates against one another and the release of built up strain. As the larger plates are pushed or pulled in different directions they build up strain against the adjacent plate until it finally fails.

What is the difference between strike direction of dip and angle of dip?

What is the difference between strike, direction of dip, and angle of dip? Strike – The compass direction of a line formed by the intersection of an inclined plane (such as a bedding plane) with a horizontal plane. … Angle of dip – A vertical angle measured downward from the horizontal plane to an inclined plane.

Why does a geologist need a compass?

This is because the compass is used to determine dip and dip-direction of surfaces (foliations), and plunge and plunge-direction of lines (lineations). … This compass has the most use by structural geologists, measuring foliation and lineation in metamorphic rocks, or faults and joints in mining areas.

What is compass clinometer?

Compasses and Clinometers A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions, or “points”. An inclinometer or clinometer is an instrument for measuring angles of slope (or tilt), elevation or depression of an object with respect to gravity.

Does a horizontal surface have a strike?

For a horizontal plane, strike is undefined. Dip direction: The dip direction will be orthogonal to the strike direction. Water will flow down the plane in this direction. … A horizontal plane has a dip of 0, and a vertical plane a dip of 90.

What is a strike geology quizlet?

Strike is the compass direction (azimuth) of a horizontal line in the plane of interest.

When a rock bends this is called?

The bending or breaking of rock is called deformation or strain. If rocks tend to break, they are said to be brittle. … If rocks tend to bend without breaking, they are said to be ductile. If a rock bends but is able to return to its original position when the stress is released, it is said to undergo elastic behavior.

Which type of fault is caused by compression?

Compressional stress, meaning rocks pushing into each other, creates a reverse fault. In this type of fault, the hanging wall and footwall are pushed together, and the hanging wall moves upward along the fault relative to the footwall. This is literally the ‘reverse’ of a normal fault.

What is the difference between fold and fault?

FOLD: Permanent wavelike deformation in layered rock or sediment. FAULT: A fracture in bedrock along which rocks on one side have moved relative to the other side.

How is dip direction determined?

You can usually determine the dip direction of inclined beds by looking at the direction of the V that forms when the bed crosses a valley on a map. This resulting V may or may not point in the direction the bed dips, depending on the slope of the valley.

What is the strike of a vertical bed?

The bed is usually not homogeneous since it usually folds when tilting, fractured, or compressed. A strike of 000° means the bed is dipping east; 090° for south; 180° for west; and 270° for north. A dip of 0° means its flat and 90° for a vertical bed.

What is strike in gold mining?

Literally, to discover gold, as in a gold mine. All it takes for a gold rush is for one prospector to strike gold. 2. To discover a source of wealth or success. The term sometimes implies that it was discovered by chance or luck.

What does BFS mean in mining?

Bankable feasibility study (BFS): A BFS represents a base case for financiers. A positive BFS is one that satisfactorily provides all of the information necessary for a bank to determine that the project is viable. Base metals: More common non-precious metals which include lead, copper, zinc, nickel.

What is a crosscut in mining?

(1) An underground mining excavation driven between two mine shafts or tunnels when a deposit of a useful mineral is opened. (2) The term given to operations designed to join two underground mining excavations with each other or to connect an excavation with the surface.

What is geology plunge?

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.